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March 2012
Length Gauges
2
Length gauges from HEIDENHAIN offer
high accuracy over long measuring ranges.
These sturdily made gauges are available in
application-oriented versions.
They have a wide range of applications in
production metrology, in multipoint
inspection stations, measuring equipment
monitoring, and as position measuring
devices.
This catalog supersedes all previous
editions, which thereby become invalid.
The basis for ordering from HEIDENHAIN
is always the catalog edition valid when
the contract is made.
Standards (ISO, EN, etc.) apply only
where explicitly stated in the catalog.
Length Gauges – Applications and Products
Range of Applications, Application Examples
4
Length Gauges from HEIDENHAIN
6
Length Gauge Overview
8
Technical Features and Mounting Information
Principle of Function
10
Mechanical Design
11
Measuring Accuracy
12
Gauging Force and Plunger Actuation
14
Mounting
16
Specifications
Accuracy Measuring range
ACANTO Absolute Length Gauges ± 2 µm 12 mm
18
HEIDENHAIN-CERTO
Incremental Length Gauges
± 0.1 µm; ± 0.03 µm*
± 0.1 µm; ± 0.05 µm*
25 mm
60 mm
20
Incremental Length Gauges ± 0.2 µm 12 mm
25 mm
22
HEIDENHAIN-METRO
Incremental Length Gauges
± 0.5 µm
± 1 µm
60 mm
100 mm
24
HEIDENHAIN-SPECTO
Incremental Length Gauges
± 1 µm 12 mm
30 mm
26
Length Gauge Accessories
Measuring Contacts, Switch Boxes, Coupling
28
Gauge Stands, Ceramic Suction
Plate, Diaphragm Compressor
For HEIDENHAIN-CERTO
30
Cable-Type Lifter, Gauge Stands for HEIDENHAIN-METRO and
HEIDENHAIN-SPECTO
32
Evaluation and Display Units
Digital Readouts
34
Evaluation Electronics
35
Electrical Connection
Interfaces Incremental Signals » 11 µA
PP 37
Incremental Signals » 1 V
PP 38
Incremental Signals « TTL
40
EnDat Absolute Position Values
42
Cables and Connecting Elements
44
General Electrical Information
48
* After linear length-error compensation in the evaluation electronics

4
Range of Applications
In Quality Assurance
Metrology and production
control
Incremental length gauges from
HEIDENHAIN play a role in incoming goods
inspection, fast dimension checking during
production, statistical process control in
production or quality assurance, or in any
application where fast, reliable and accurate
length measurement is required. Their large
measuring lengths are a particular advantage:
whether the part measures 5 mm or 95 mm,
it is measured immediately with one and
the same length gauge.
Whatever the application, HEIDENHAIN
has the appropriate length gauge for the
required accuracy. The HEIDENHAIN-
CERTO length gauges offer a very high
accuracy of ± 0.1 µm/± 0.05 µm*/± 0.03 µm*
for extremely precise measurement.
Length gauges from the HEIDENHAIN-
METRO program have accuracy grades as
fine as ± 0.2 µm, while the HEIDENHAIN-
SPECTO length gauges, with ± 1 µm
accuracy, offer particularly compact
dimensions.
* After linear length-error compensation in
the evaluation electronics
Gauge block calibration and
measuring device inspection
The usual inspection of measuring
equipment called for by standards, and the
inspection of gauge blocks in particular,
necessitate a large number of reference
standard blocks if the comparative
measurement is performed using inductive
length gauges. The problem is the small
measuring range of inductive gauges: they
can measure length differences of only up
to 10 µm. Incremental length gauges, which
offer large measuring ranges together with
high accuracy, greatly simplify the calibration
of measuring devices required to ensure
traceability.
The length gauges of the HEIDENHAIN-
CERTO program with measuring ranges of
25 mm with ± 0.1 µm/± 0.03 µm* accuracy
and 60 mm with ± 0.1 µm/± 0.05 µm*
accuracy are especially well suited for this
task. It permits a significant reduction in
the required number of reference standard
blocks, and recalibrating becomes much
simpler.
Thickness gauging of
silicon wafers
Inspection of styli
Calibration of gauge
blocks

























5
Multipoint inspection
apparatuses
Multipoint inspection devices require durable
length gauges with small dimensions. They
should also have relatively large measuring
ranges of several millimeters with consistent
linear accuracy in order to simplify the
construction of inspection devices—for
example by enabling the construction of
one device for several masters. A large
measuring length also provides benefits in
master production, because simpler masters
can be used.
Thanks to their small dimensions, the
ACANTO absolute length gauge, like the
HEIDENHAIN-SPECTO incremental length
gauge, are specially designed for multi-point
measuring stations. The feature accuracy
grades up to ± 1 µm over measuring ranges
up to 30 mm. Higher accuracy requirements
up to ± 0.2 µm can be met with similarly
compact HEIDENHAIN-METRO length
gauges.
Unlike inductive gauges, HEIDENHAIN-
SPECTO length gauges provide stable
measurement over long periods—
eliminating recalibration.
Position measurement
Incremental length gauges from
HEIDENHAIN are also ideal for position
measurement on precision linear slides or
X-Y tables. Working with measuring
microscopes, for example, becomes much
easier thanks to the digital readout and the
flexible datum setting.
Here, length gauges from the
HEIDENHAIN-METRO and HEIDENHAIN-
SPECTO program come into use with large
measuring ranges of 30 mm, 60 mm or
100 mm at consistently high accuracy
grades of ± 0.5 µm or ± 1 µm.
In this application as linear measuring
device, the length gauge’s fast installation
in accordance with the Abbe measuring
principle by its clamping shank or planar
mounting surface is of special benefit.
Testing station for
flatness inspection
Position measurement on an X-Y table for lens mounting
In Production
Tolerance gauging of
semifinished products
6
Length Gauges from HEIDENHAIN
High accuracy
The high accuracy specified for
HEIDENHAIN length gauges applies over
the entire measuring length. Whether the
part measures 10 or 100 mm, its actual
dimension is always measured with the
same high quality. The high repeatability of
HEIDENHAIN length gauges comes into
play during comparative measurements,
for example in series production.
A number of arguments speak for
HEIDENHAIN length gauges. These include
not only their technical features, but also
their high quality standard and the
worldwide presence of HEIDENHAIN.
Large measuring ranges
HEIDENHAIN length gauges are available
with measuring lengths of 12 mm, 25 mm,
30 mm, 60 mm or 100 mm. so that you
can measure very different parts in one
measuring setup and avoid frequently
changing setups with expensive gauge
blocks or masters.
Robust design
HEIDENHAIN length gauges are built for
an industrial environment. They feature
consistently high accuracy over a long
period of time as well as high thermal
stability. They can therefore be used in
production equipment and machines.

























7
Wide range of applications
HEIDENHAIN length gauges are suited for
many applications. Automatic inspection
equipment, manual measuring stations or
positioning equipment—wherever lengths,
spacing, thickness, height or linear motion
are to be measured, HEIDENHAIN length
gauges function quickly, reliably and
accurately.
Know-how
The high quality of HEIDENHAIN length
gauges is no coincidence. HEIDENHAIN
has been manufacturing high-accuracy
scales for over 70 years, and for many
years it has developed measuring and
testing devices for length and angle
measurement for national standards
laboratories. This know-how makes
HEIDENHAIN an extraordinarily qualified
partner for metrology questions.
Worldwide presence
HEIDENHAIN is represented in all
important industrial countries—in most of
them with wholly owned subsidiaries.
Sales engineers and service technicians
support the user on-site with technical
information and servicing in the local
language.
Absolute position measurement
The ACANTO length gauges operate with
absolute measurement over a range of
12 mm and with high repeatability. It's
particular advantage is that the measured
value is available immediately after
switch-on.
CT 6000 CT 2500 MT 101 MT 60
8
Length Gauge Overview
Accuracy Measuring range
Plunger actuation
Absolute position measurement
± 2 µm ACANTO
By measured object
Pneumatic
Incremental linear measurement
± 0.1 µm
± 0.05 µm
*)
± 0.03 µm
*)
HEIDENHAIN-CERTO
By motor
By external coupling
± 0.2 µm HEIDENHAIN-METRO
By cable lifter or
measured object
Pneumatic
± 0.5 µm
± 1 µm
HEIDENHAIN-METRO
By motor
By external coupling
± 1 µm HEIDENHAIN-SPECTO
By measured object
Pneumatic
*)
After linear length-error compensation in
the evaluation electronics
ST 3000 ST 1200 MT 2500 MT 1200 AT 1200 AT

























9
12 mm 25 mm/
30 mm
60 mm 100 mm Page

18
AT 1218 EnDat
AT 1217 EnDat


20
CT 2501 » 11 µA
PP
CT 2502 » 11 µA
PP
CT 6001 » 11 µA
PP
CT 6002 » 11 µA
PP


22
MT 1271 « TTL
MT 1281 » 1 V
PP
MT 1287 » 1 V
PP
MT 2571 « TTL
MT 2581 » 1 V
PP
MT 2587 » 1 V
PP


24
MT 60 M » 11 µA
PP
MT 60 K » 11 µA
PP
MT 101 M » 11 µA
PP
MT 101 K » 11 µA
PP


26
ST 1278 « TTL
ST 1288 » 1 V
PP
ST 1277 « TTL
ST 1287 » 1 V
PP
ST 3078 « TTL
ST 3088 » 1 V
PP
ST 3077 « TTL
ST 3087 » 1 V
PP

5

µ
m
10
Principle of Function
HEIDENHAIN length gauges are
characterized by long measuring ranges
and consistently high accuracy. The basis
for both is the photoelectrical scanning
principle.
HEIDENHAIN linear encoders use material
measuring standards consisting of absolute
or incremental graduations on substrates
of glass or glass ceramic. These measuring
standards permit large measuring ranges,
are insensitive to vibration and shock, and
have a defined thermal behavior. Changes in
atmospheric pressure or relative humidity
have no influence on the accuracy of the
measuring standard—which is the
prerequisite for the high long-term
stability of HEIDENHAIN length gauges.
The masters for these graduations are
fabricated on dividing engines developed
and built by HEIDENHAIN. High thermal
stability during the manufacturing process
ensures that the graduations have high
accuracy over the measuring length. The
master graduation is applied to the carrier
using the DIADUR copying process
developed by HEIDENHAIN, which
produces very thin but durable graduation
structures of chromium.
The graduation is photoelectrically
scanned without mechanical contact and
therefore without wear. Light passes
through the structured scanning reticle and
over the scale onto photovoltaic cells. The
photovoltaic cells produce sinusoidal
output signals with a small signal period.
Interpolation in the subsequent electronics
makes very small measuring steps into the
nanometer range possible. The scanning
principle, together with the extremely fine
graduation lines and their high edge
definition ensure the quality of the output
signals as well as the small position error
within one signal period. This applies
particularly to HEIDENHAIN length gauges,
which use a DIADUR phase grating as
measuring standard. The interferential
scanning method produces sinusoidal
incremental signals with a period of only
2 µm.
DIADUR phase grating with approx. 0.25 µm
grating height
Grating period
Carrier
Reference mark
Incremental
graduation
DIADUR graduation
Incremental Measuring Method
With the incremental measuring method,
the graduation consists of a periodic
grating structure. The position information
is obtained by counting the individual
increments (measuring steps) from some
point of origin. Since an absolute reference
is required to ascertain positions, the
measuring standard is provided with an
additional track that bears a reference
mark. The absolute position on the scale,
established by the reference mark, is gated
with exactly one signal period.
The reference mark must therefore be
scanned to establish an absolute reference
or to find the last selected datum.
Absolute measuring method
With the absolute measuring method, the
position value is available from the encoder
immediately upon switch-on and can be
called at any time by the subsequent
electronics. There is no need to move the
axes to find the reference position. The
absolute position information is read from
the graduated disk, which is formed from
a serial absolute code structure. A separate
incremental track is interpolated for the
position value and at the same time—
depending on the interface version—is
used to generate an optional incremental
signal.

























11
Mechanical Design
HEIDENHAIN length gauges function
according to the Abbe measuring principle,
i.e. the measuring standard and the
plunger are exactly aligned. All components
comprising the measuring loop, such as
the measuring standard, plunger, holder
and scanning head are designed in terms
of their mechanical and thermal stability for
the highest possible accuracy of the length
gauge.
HEIDENHAIN length gauges have a defined
thermal behavior. Since temperature
variations during measurement can result
in changes in the measuring loop,
HEIDENHAIN uses special materials with
low coefficients of expansion Þ
therm
for
the components of the measuring loop,
for example in the CERTO length gauges.
The scale is manufactured of Zerodur

therm
0 K
–1
), and the plunger and holder
are of Invar (Þ
therm
1 · 10
–6
K
–1
). This
makes it possible to guarantee its high
measuring accuracy over a relatively large
temperature range.
Length gauges from HEIDENHAIN feature
a sturdy design. Even high vibration and
shock loads have no negative influence on
the accuracy.
The ball-bush guided plunger tolerates
high radial forces and moves with very low
friction. It has an M2.5 thread to hold
measuring contacts.
Expendable parts
HEIDENHAIN length gauges contain
components that are subject to wear,
depending on the application and
manipulation. These include in particular
the following parts:
LED light source •
Guideway (tested for at least 5 million •
strokes*)
Cable link for CT, MT 60 and MT 101 •
(tested for at least 1 million strokes*)
Scraper rings •
Rubber bellows for AT and ST 1200 •
* With CT, MT 60 M and MT 101 M only
with actuation by switch box
Layout of ST 1200
Connecting cable
Measuring standard
Scanning unit with light source,
photocells and scanning
electronics
Ball-bush guide
Plunger
Rubber bellows
Measuring contact
Layout of CT 6000
MT 60
Measuring standard
(scale)
Holder
Scanning unit with light source
and photovoltaic cells
Ball-bush guide
Plunger
Measuring contact
DIADUR is a registered trademark of
DR. JOHANNES HEIDENHAIN GmbH,
Traunreut, Germany.
Zerodur®is a registered trademark of
Schott-Glaswerke, Mainz, Germany.
12
Measuring Accuracy
The accuracy of position measurement
with length gauges is mainly determined
by the following factors:
the quality of the graduation, •
the quality of the scanning process, •
the quality of the signal processing •
electronics,
the error from the scale guideway •
relative to the scanning unit.
A distinction is made between position
error over relatively large paths of
traverse—for example the entire
measuring range—and that within one
signal period.
Position error over the measuring range
Length gauge accuracy is specified as
system accuracy, which is defined as
follows:
The extreme values of the total error
F—with reference to their mean value—lie
over the entire measuring length within the
system accuracy ± a. They are measured
during the final inspection and documented
in the calibration chart.
Position error within one signal period
The position error u within one signal
period is determined by the signal period of
the length gauge, as well as the quality of
the graduation and the scanning thereof.
At any position over the entire measuring
length, it does not exceed approx. ± 1 % of
the signal period.
The smaller the signal period, the smaller
the position error within one signal period.
In the calibration chart of the HEIDENHAIN-
CERTO, this position error within one signal
period is shown as a tolerance band.
Signal period of the
scanning signals
Max. position error u within
one signal period (approx.)
CT 2500
CT 6000
2 µm ± 0.02 µm
MT 1200
MT 2500
2 µm ± 0.02 µm
MT 60
MT 101
10 µm ± 0.1 µm
ST 1200
ST 3000
20 µm ± 0.2 µm
AT 1200 188.4 µm ± 0.7 µm
Position error a over the measuring length ML
P
o
s
i
t
i
o
n

e
r
r
o
r

f
Position error within
one signal period
Position f
Position error u within one signal period
Signal period
360° elec.
S
i
g
n
a
l

l
e
v
e
l

f
P
o
s
i
t
i
o
n

e
r
r
o
r

f

























13
All HEIDENHAIN length gauges are
inspected before shipping for accuracy and
proper function.
They are calibrated for accuracy during
retraction and extension of the plunger.
For the HEIDENHAIN-CERTO, the number
of measuring positions is selected to
ascertain very exactly not only the long-range
error, but also the position error within one
signal period.
The manufacturer’s inspection certificate
confirms the specified system accuracy
of each length gauge. The calibration
standards ensure the traceability—as
required by EN ISO 9001—to recognized
national or international standards.
For the HEIDENHAIN-METRO and
HEIDENHAIN CERTO series, a calibration
chart documents the position error over
the measuring range. It also shows the
measuring step and the measuring
uncertainty of the calibration measurement.
For the HEIDENHAIN-METRO the calibration
chart shows the mean value of one forward
and one backward measuring stroke.
The HEIDENHAIN-CERTO is represented in
the calibration chart as the envelope curve
of the measured error. The HEIDENHAIN-
CERTO length gauges are supplied with
two calibration charts, each for different
operating attitudes.
Example
Temperature range
The length gauges are inspected at a
reference temperature of 20 °C. The
system accuracy given in the calibration
chart applies at this temperature.
The operating temperature indicates the
ambient temperature limits between which
the length gauges will function properly.
The storage temperature range of –20 °C
to 60 °C applies for the device in its
packaging.
Operating attitude for calibration chart 2
Operating attitude for calibration chart 1
14
Gauging Force—Plunger Actuation
Gauging force
Gauging force is the force that the plunger
exercises on the measured object. An
excessively large gauging force can cause
deformation of the measuring contact and
the measured object. If the gauging force
is too small, an existing dust film or other
obstacle may prevent the plunger from
fully contacting the measured object. The
gauging force depends on the type of
plunger actuation.
Plunger actuation by spring
For the AT 1218, MT 12x1, MT 25x1, ST 12x8
and ST 30x8, the integral spring extends the
plunger to the measuring position and applies
the gauging force. In its resting position,
the plunger is extended. The gauging force
depends on the following criteria:
The operating attitude •
The plunger position, because the gauging •
force changes over the measuring range
The measuring direction, i.e., whether •
the gauge measures with extending or
retracting plunger
In the diagrams, the measuring force is
shown over the measuring range for a
retracting and extending plunger in a
horizontal operating attitude.
Plunger actuation by measured object
The complete length gauge is moved
relative to the measured object. The
measurement is made with retracting
plunger.
Plunger actuation via cable-type lifter
(MT 12x1, MT 25x1)
Through a cable mechanism, the plunger is
retracted by hand and then extended onto
the measured object. The measurement is
made with extending plunger.
The diagrams apply for the horizontal
operating attitude. The following
compensation values are to be taken into
account for other operating attitudes.
Model Operating attitude vertically
Upward Downward
AT 121x – 0.12 N + 0.12 N
MT 12xx – 0.13 N + 0.13 N
MT 25x1 – 0.17 N + 0.17 N
MT 2587 – 0.19 N + 0.19 N
ST 12x7 – 0.07 N + 0.07 N
ST 12x8 – 0.08 N + 0.08 N
ST 30xx – 0.11 N + 0.11 N
G
a
u
g
i
n
g

f
o
r
c
e

[
N
]
f
Distance [mm] f
MT 12x1 extending
MT 12x1 retracting
ST 12x8 extending
ST 12x8 retracting
AT 12x8 extending
AT 12x8 retracting
G
a
u
g
i
n
g

f
o
r
c
e

[
N
]
f
Distance [mm] f
MT 25x1 extending
MT 25x1 retracting
ST 30x8 extending
ST 30x8 retracting

























15
Pneumatic plunger actuation
The pneumatically actuated plungers of the
AT 1217, MT 1287, MT 2587, ST 12x7 and
ST 30x7 length gauges are extended by
the application of compressed air.
When the air connection is ventilated, the
integral spring retracts the plunger. to a
protected resting position within the
housing.
The gauging force can be adjusted to the
measuring task through the level of air
pressure. At constant pressure, it depends
on the operating attitude and the plunger
position.
The diagrams show the respective
measuring force for a horizontal operating
attitude depending on the compressed air
applied with the plunger extending and
retracting fully. These are approximate
values that are subject to changes due to
tolerances and depend on seal wear.
Motorized plunger actuation
The CT 2501, CT 6001, MT 60 M and
MT 101 M length gauges feature an integral
motor that moves the plunger. It is operated
through the switch box either by push button
or over the connection for external actuation.
The plungers of the CT 2501, CT 6001, and
MT 60 M length gauges must not be moved
by hand if the switch box is connected.
The gauging force of the CT 2501, CT 6001,
and MT 60 M motorized length gauges is
adjustable in three stages through the
switch box. The force remains constant
over the measuring range but depends on
the operating attitude.
Regardless of the operating attitude—
whether it measures vertically downward
(with the SG 101 V switchbox) or horizontally
(with the SG 101 H switch box)—the
MT 101 M exercises a constant gauging
force.
Switch box and power adapter (only with
MT101 M) must be ordered separately.
External plunger actuation by coupling
For the CT 2502, CT 6002, MT 60 K,
MT 101 K and special versions “without
spring” of the MT 1200 and MT 2500, the
plunger is freely movable. For position
measurement, the plunger is connected by
a coupling with a moving machine element.
The force needed to move the plunger is
specified as the required moving force.
It depends on the operating attitude.
Note
The compressed air introduced directly
into the length gauges must be properly
conditioned and must comply with the
following quality classes as per ISO 8573-1
(1995 edition):
Solid contaminant: Class 1 •
(max. particle size 0.1 µm and max.
particle density 0.1 mg/m
3
at 1 · 10
5
Pa)
Total oil content: Class 1 •
(max. oil concentration 0.01 mg/m
3

at 1 · 10
5
Pa)
Maximum pressure dew point: Class 4, •
but with reference conditions of
+3 °C at 2 · 10
5
Pa
HEIDENHAIN offers the DA 400
Compressed Air Unit for purifying
compressed air.
For more information, ask for our DA 400
Product Information sheet.
G
a
u
g
i
n
g

f
o
r
c
e

[
N
]
f
Pressure [bars] f
MT 12x7 retracted
MT 12x7 extended
ST 12x7 retracted
ST 12x7 extended
AT 12x7 retracted
AT 12x7 extended
G
a
u
g
i
n
g

f
o
r
c
e

[
N
]
f
Pressure [bars] f
MT 2587 retracted
MT 2587 extended
ST 30x7 retracted
ST 30x7 extended
16
Mounting
In addition to the length gauge itself, the
mechanical design of the measuring setup
also plays a role in defining the quality of
measurement.
Abbe principle
HEIDENHAIN length gauges enable you to
work according to the Abbe measuring
principle: The measured object and scale
must be in alignment to avoid additional
measuring error.
Measuring loop
All components included in the measuring
loop such as the holder for the measured
object, the gauge stand with holder, and
the length gauge itself influence the result
of measurement. Expansion or deformation
of the measuring setup through mechanical
or thermal influences adds directly to the
error.
Mechanical design
A stable measuring assembly must be
ensured. Long lateral elements within the
measuring loop are to be avoided.
HEIDENHAIN offers a stable gauge stand
as an accessory.
The force resulting from the measurement
must not cause any measurable
deformation of the measuring loop.
Incremental length gauges from
HEIDENHAIN operate with small gauging
force and have very little influence on the
measuring setup.
Thermal behavior
Temperature variations during measurement
cause changes in length or deformation of
the measuring setup. After a change in
temperature of 5 K, a steel bar of 200 mm
length expands by 10 µm.
Length changes resulting from a uniform
deviation from the reference temperature
can largely be compensated by resetting
the datum on the measuring plate or a
master; only the expansion of the scale
and measured object go into the result of
measurement. Temperature changes during
measurement cannot be ascertained
mathematically.
For critical components, HEIDENHAIN
therefore uses special materials with low
coefficients of expansion, such as are
found in the HEIDENHAIN-CERTO gauge
stand. This makes it possible to guarantee
the high accuracy of HEIDENHAIN-CERTO
even at ambient temperatures of 19 to 21 °C
and variations of ± 0.1 K during
measurement.
Thermally induced length change
Expansion of the measuring loop components
as a result of heat
Acceleration
Shock and vibration of any kind is to be
avoided during measurement so as not to
impair the high accuracy of the length
gauge.
The maximum values given in the
specifications apply to the effect of external
acceleration on the length gauge. They
describe only the mechanical stability of
the length gauge, and imply no guarantee
of function or accuracy.
In the length gauge itself, unchecked
extension of the spring-driven or non-coupled
moving plunger can cause high acceleration
onto the measured object or measuring plate
surface. For the MT 1200 and MT 2500
series length gauges, use the cable-type
lifter whenever possible (see Accessories).
The cable lifter features adjustable pneumatic
damping to limit the extension velocity to
an uncritical value.
The measuring loop:
All components involved in the
measuring assembly, including
the length gauge
Ž+

!2
C !0H7
9
.
9

0
.
!
CT 6000
MT 60
MT 101
CT 2500
Ž+

























17
Fastening
The CT 6000, MT 60 and MT 101 length
gauges are fastened by two screws onto a
plane surface. This ensures a mechanically
stable installation of even these large
length gauges. Special holders are available
for fastening the MT 60 and MT 101 to the
MS 100 gauge stand for the HEIDENHAIN-
METRO (see Accessories).
The CT 2500 is mounted by its standard
clamping shank with 16h8 diameter. A
holder is available for fastening the
HEIDENHAIN-CERTO to the gauge stand
(see Accessories).
The AT, ST, MT 1200 and MT 2500 length
gauges feature a standard clamping shank
with 8h6 diameter. These HEIDENHAIN
length gauges can therefore easily be used
with existing measuring fixtures and stands.
As an accessory, HEIDENHAIN offers a
special clamping sleeve and screw. It
facilitates fastening the length gauge
securely without overstressing the
clamping shank.
Clamping sleeve ID 386811-01
Operating attitude for HEIDENHAIN-
CERTO
The HEIDENHAIN-CERTO can be operated
at any attitude. However, the mounting
position with horizontal length gauge and
upward facing mounting surface should be
avoided because in such a case no
guarantee can be made for accuracy.
Orthogonal mounting
The length gauge is to be mounted so that
its plunger is exactly orthogonal to the
measured object or the surface on which it
rests. Deviations result in measuring error.
The accessory HEIDENHAIN gauge stands
with holders for an 8 mm clamping shank
ensure orthogonal mounting. Length
gauges that provide planar mounting
surfaces are to be adjusted in the direction
parallel to the mounting surface (Y) to be
perpendicular to the measuring plate. A
quick and reliable adjustment is possible
with the aid of a gauge block or a parallel
block. The perpendicularity to the measuring
table (X) is already ensured by the gauge
stand.
AT 1218
AT 1217
18
ACANTO
Absolute Length Gauges with EnDat Interface
Very compact dimensions •
Protected from splash water •
Thanks to their small dimensions, the
ACANTO length gauges are the product of
choice for multipoint inspection apparatus
and testing equipment. Absolute position
measurement provides the measured
values immediately after switch-on. This is
particularly favorable on measuring stations
with numerous measuring points: as the
measured value is already generated in the
length gauge there is no need for the
counting electronics for each measuring
point that would otherwise be necessary.
Plunger actuation
The AT 1218 length gauge features a
spring-tensioned plunger that is extended
at rest.
In the pneumatic length gauges AT 1217,
the plunger is retracted to its rest position
by the integral spring. It is extended to the
measuring position by application of
compressed air.
Mounting
The ACANTO length gauges are fastened
by their 8h6 standard clamping shank.
Interface
The ACANTO length gauges have a
bidirectional serial EnDat interface for
transmission of the absolute position
values and internal encoder information.
Mechanical Data
Plunger actuation
Position of plunger at rest
Measuring standard
System accuracy
Repeatability
Measuring range
Gauging force
Compressed air
Mech. permissible traversing speed
Radial force
Operating attitude
Vibration 55 Hz to 2 000 Hz
Shock 11 ms
Protection EN 60 529
Operating temperature
Fastening
Weight without cable
Electrical Data
Absolute position values
Ordering designation
Resolution
Processing time
Electrical connection
Cable length
Power supply
s = Beginning of measuring length
AT 1200

























19
AT 1218 AT 1217
By measured object
Extended
Pneumatic
Retracted
DIADUR grating on glass; grating period 188.4 µm
± 2 µm
± 0.1 µm according to DIN 32876 (in the cyclical, thermally balanced operating condition)
12 mm
See Gauging Force—Plunger Actuation
– † 1.8 bars
† 60 m/min
† 0.5 N (mechanically permissible)
Any
†100 m/s
2
(EN 60 068-2-6)
† 500 m/s
2
(EN 60 068-2-27)
IP 67 IP 64 (IP 67 with sealing air)
10 to 40 °C; reference temperature 20 °C
Clamping shank ¬ 8h6
80 g
EnDat
EnDat 2.2
EnDat 22
23 nm
† 5 µs
M12 flange socket, axial
† 100 m with HEIDENHAIN cable
3.6 to 14 V DC/< 150 mA at 5 V

CT 2500
CT 6000
20
HEIDENHAIN-CERTO
Length Gauges with ± 0.1 µm/± 0.05 µm*/± 0.03 µm* Accuracy
For Very High Accuracy •
For inspection of measuring equipment and gauge blocks •
HEIDENHAIN-CERTO length gauges
feature a large measuring range, provide
high linear accuracy and offer resolution in
the nanometer range. They are used
predominantly for production quality
control of high-precision parts and for the
monitoring and calibration of reference
standards. Length gauges reduce the
number of working standards required to
calibrate gauge blocks.
Accuracy
The total error of HEIDENHAIN-CERTO
length gauges lies within ± 0.1 µm. After
linear length error compensation in the
evaluation electronics, of the ND 28x digital
readout, for example, HEIDENHAIN
guarantees accuracy of ± 0.03 µm for the
CT 2500 and ± 0.05 µm for the CT 6000.
These accuracy grades apply over the
entire measuring range at ambient
temperatures between 19 °C and 21 °C
and with a temperature variation of ± 0.1 K
during measurements using the CS 200
gauge stand for the HEIDENHAIN-CERTO.
Plunger actuation
The plunger of the CT 2501 and CT 6001
is extended and retracted by an integral
motor. It can be actuated by the associated
switch box, which can also be controlled by
external signal.
The CT 2502 and CT 6002 have no plunger
drive. The freely movable plunger is
connected by a separate coupling with the
moving machine element.
Mounting
The CT 2500 length gauge is fastened by
its 16 mm diameter clamping shank. The
CT 6000 is fastened with two screws on a
plane surface. The CS 200 gauge stand
(see Accessories) was conceived specially
for HEIDENHAIN-CERTO length gauges.
It fulfills the requirements of high precision
measurement with respect to thermal
behavior, stability, orthogonality and flatness
of the measuring plate surface. A special
holder is available as an accessory for
mounting the CT 2500.
Output signals
The HEIDENHAIN-CERTO length gauges
provide » 11 µA
PP
current signals for
HEIDENHAIN subsequent electronics.
* After linear length-error compensation in
the evaluation electronics
r = Reference mark position
CT 2500
CT 6000

























21
Specifications CT 2501
CT 6001
CT 2502
CT 6002
Plunger actuation By motor Separate coupling with
moving machine part
Measuring standard DIADUR phase grating on Zerodur glass ceramic
Grating period 4 µm
System accuracy
at 19 to 21 °C CT 2500
CT 6000
± 0.1 µm without compensation;
± 0.03 µm after linear length error compensation
± 0.05 µm after linear length error compensation
Recommd. measuring step 0.01 µm/0.005 µm (5 nm) with ND 28x
Reference mark Approx. 1.7 mm below upper stop
Measuring range CT 2500
CT 6000
25 mm
60 mm
Gauging force
Vertically downward
Vertically upward
Horizontal
1 N/1.25 N/1.75 N
– /– /0.75 N
– /0.75 N/1.25 N

Required moving force – 0.1 N to 0.6 N (depending
on operating attitude)
Radial force † 0.5 N (mechanically permissible)
Operating attitude Any required (for preferred operating attitude see page 13)
Vibration 55 Hz to 2 000 Hz
Shock 11 ms
† 100 m/s
2
(EN 60 068-2-6)
† 1 000 m/s
2
(EN 60 068-2-27)
Protection EN 60 529 IP 50
Operating temperature 10 to 40 °C; reference temperature 20 °C
Fastening CT 2500
CT 6000
Clamping shank ¬ 16h8
Plane surface
Weight CT 2500
without cable CT 6000
520 g
700 g
480 g
640 g
Incremental signals » 11 µA
PP
; signal period 2 µm
Measuring velocity † 24 m/min (depending on the subsequent electronics)
† 12 m/min with the ND 28x display unit
Electrical connection* Cable, 1.5 m, with 15-pin D-sub connector •
Cable, 1.5 m, with 9-pin M23 connector •
Interface electronics are integrated in connector.
Cable length † 30 m with HEIDENHAIN cable
Power supply 5 V DC ± 5 %/< 180 mA 5 V DC ± 5 %/< 120 mA
Required accessories* For CT 2501 For CT 6001
Switch box SG 25 M
ID 317436-01
SG 60 M
ID 317436-02
* Please select when ordering
MT 1200
MT 2500
MT 1287
MT 2587
22
HEIDENHAIN-METRO
Length Gauges with ± 0.2 µm Accuracy
High repeatability •
Plunger actuation by cable release, by the workpiece or pneumatically •
With their high system accuracy and small
signal period, the HEIDENHAIN-METRO
MT 1200 and MT 2500 length gauges are
ideal for precision measuring stations and
testing equipment. They feature ball-bush
guided plungers and therefore permit high
radial forces.
Plunger actuation
The length gauges of the MT 12x1 and
MT 25x1 series feature a spring-tensioned
plunger that is extended at rest. In a
special version without spring it exercises
particularly low force on the measured
object.
In the pneumatic length gauges MT 1287
and MT 2587, the plunger is retracted to
its rest position by the integral spring. It is
extended to the measuring position by
application of compressed air.
Mounting
The MT 1200 and MT 2500 length gauges
are fastened by their 8h6 standard clamping
shank. A mounting bracket is available as
an accessory to mount the length gauges
to plane surfaces or to the MS 200 from
HEIDENHAIN.
Output signals
The MT 1200 and MT 2500 length gauges
are available with various output signals.
The MT 128x and MT 258x length gauges
provide sinusoidal voltage signals with
1 V
PP
levels, which permit high interpolation.
The MT 1271 and MT 2571 feature
integrated digitizing and interpolation
electronics with 5-fold or 10-fold interpolation
(as ordered) and square-wave signals in
TTL levels.
r = Reference mark position
s = Beginning of measuring length
À = Air connection for 2 mm tube
MT 12x1 MT 1287
L1 18,5 22,0
L2 10,1 6,2
L3 8,1 4,2
MT 25x1 MT 2587
L1 37,0 41,0
L2 10,1 6,2
L3 8,1 4,2
Mechanical Data
Plunger actuation
Position of plunger at rest
Measuring standard
System accuracy
Reference mark
Measuring range
Gauging force
Version “without spring”
Vertically downward
Compressed air
Radial force
Operating attitude
Vibration 55 Hz to 2 000 Hz
Shock 11 ms
Protection EN 60 529
Operating temperature
Fastening
Weight without cable
Electrical Data
For length gauges
Incremental signals*
Signal period
Recommended measuring step
Mech. permissible traversing speed
Edge separation a at scanning frequency*/
traverse speed
200 kHz † 24 m/min
100 kHz † 12 m/min
50 kHz † 6 m/min
25 kHz † 3 m/min
Electrical connection*
(Interface electronics integrated in connector)
Cable length
Power supply
* Please select when ordering
MT 1200
MT 2500

























23

MT 1271 « TTL
MT 1281 » 1 V
PP
MT 2571 « TTL
MT 2581 » 1 V
PP
MT 1287 » 1 V
PP
MT 2587 » 1 V
PP
By cable or measured object
Extended
Pneumatic
Retracted
DIADUR phase grating on Zerodur glass ceramic; grating period 4 µm
± 0.2 µm
Approx. 1.7 mm below upper stop
12 mm 25 mm 12 mm 25 mm
See Gauging Force—Plunger Actuation
0.13 N 0.17 N –
– † 1.4 bars
† 0.8 N (mechanically permissible)
Any; Version “without spring”: Vertically downward
† 100 m/s
2
(EN 60 068-2-6)
† 1 000 m/s
2
(EN 60 068-2-27)
IP 50 IP 64 (with sealing air)
10 to 40 °C; reference temperature 20 °C
Clamping shank ¬ 8h6
100 g 180 g 110 g 190 g
« TTL
MT 1271
MT 2571
» 1 V
PP
MT 128x
MT 258x
« TTL x 5
0.4 µm
« TTL x 10
0.2 µm
» 1 V
PP
2 µm
0.1 µm
1)
0.05 µm
1)
0.1 µm/0.05 µm
† 30 m/min

‡ 0.23 µs
‡ 0.48 µs
‡ 0.98 µs


‡ 0.23 µs
‡ 0.48 µs
‡ 0.98 µs

Cable, 1.5 m, with 15-pin D-sub connector Cable 1.5 m with
D-sub connector, 15-pin •
M23 connector, 12 pin •
† 30 m with HEIDENHAIN cable
5 V DC ± 5 %/< 160 mA (without load) 5 V DC ± 5 %/< 130 mA

1)
After 4-fold evaluation
MT 60
MT 101
24
HEIDENHAIN-METRO
Length Gauges with ± 0.5 µm/± 1 µm Accuracy
Large measuring ranges •
For dimensional and positional measurement •
Large measuring ranges together with
their high accuracy make the MT 60 and
MT 101 HEIDENHAIN-METRO length
gauges attractive for incoming inspection,
production monitoring, quality control, or
anywhere parts with very different
dimensions are measured. But they are
also easy to mount as highly accurate
position encoders, for example on sliding
devices or X-Y tables.
Plunger actuation
M version length gauges feature an
integral motor that retracts and extends
the plunger. While the MT 101 M operates
at a constant gauging force, the MT 60 M
allows you to select from three gauging
force levels.
K version gauges have no integral plunger
actuation. The plunger is freely movable.
It can be connected to moving elements
such as linear slides and X-Y table by a
coupling (see Accessories).
Mounting
The length gauges are mounted onto a
flat surface by two screws. The M versions
can also be mounted in the MS 100 and
MS 200 gauge stands.
Output signals
The MT 60 and MT 101 provide
» 11 µA
PP
current signals for
HEIDENHAIN subsequent electronics.
r = Reference mark position
MT 60 M
MT 101 M

























25
Specifications MT 60 M
MT 60 K
MT 101 M
MT 101 K
Plunger MT xx M
actuation MT xx K
By motor
Via separate coupling with moving machine part
Measuring standard DIADUR grating on silica glass; grating period 10 µm
System accuracy ± 0.5 µm ± 1 µm
Recommd. measuring step 1 µm to 0.1 µm
Reference mark Approx. 1.7 mm from top Approx. 10 mm from top
Measuring range 60 mm 100 mm
Gauging force
Vertically downward
Vertically upward
Horizontal
With MT 60 M
1 N/1.25 N/1.75 N
– /– /0.75 N
– /0.75 N/1.25 N
With MT 101 M
0.7 N with SG 101 V

0.7 N with SG 101 H
Required moving force
with MT xx K
0.1 to 0.6 N (depends on
operating attitude)
0.5 to 2 N (depends on
operating attitude)
Radial force
1)
† 0.5 N †2 N
Operating MT xx M
attitude
MT xx K
Any
Any
Vertically downward with
SG 101 V
Horizontal with SG 101 H
Any
Vibration 55 Hz to 2 000 Hz
Shock 11 ms
† 100 m/s
2
(EN 60 068-2-6)
† 1 000 m/s
2
(EN 60 068-2-27)
Protection EN 60 529 IP 50
Operating temperature 10 to 40 °C; reference temperature 20 °C
Fastening Plane surface
Weight MT xx M
without cable MT xx K
700 g
600 g
1400 g
1200 g
Incremental signals » 11 µA
PP
; signal period 10 µm
Measuring velocity
2)
† 18 m/min † 60 m/min
Electrical connection*
Cable length
Cable, 1.5 m, with 15-pin D-sub connector; •
Cable 1.5 m with 9-pin M23 connector (male); •
† 30 m with HEIDENHAIN cable
Power MT xx M
supply MT xx K
Switch box
5 V DC ± 5 %/< 120 mA
5 V DC ± 5 %/< 70 mA

5 V DC ± 5 %/< 70 mA
5 V DC ± 5 %/< 70 mA
Via power adapter

Required accessories* For MT 60 M For MT 101 M
Switch box SG 60 M Vertical position: SG 101 V
Horizontal position: SG 101 H
Power supply unit
100 V AC to 240 V AC
– ID 648029-01
* Please select when ordering
2)
depending on the subsequent electronics
1)
Mechanically permissible
ST 12x7
ST 30x7
26
HEIDENHAIN-SPECTO
Length Gauges with ± 1 µm Accuracy
Very compact dimensions •
Splash-proof •
Thanks to their very small dimensions,
the HEIDENHAIN-SPECTO length gauges
are the product of choice for multipoint
inspection apparatus and testing equipment.
Plunger actuation
The length gauges of the ST 12x8 and
ST 30x8 series feature a spring-tensioned
plunger that is extended at rest.
In the pneumatic length gauges ST 12x7
and ST 30x7 the plunger is retracted to its
rest position by the integral spring. It is
extended to the measuring position by
application of compressed air.
Mounting
The HEIDENHAIN-SPECTO length gauges
are fastened by their 8h6 standard
clamping shank.
Output signals
The HEIDENHAIN-SPECTO length gauges
are available with various output signals.
The ST 128x and ST 308x length gauges
provide sinusoidal voltage signals with
1 V
PP
levels, which permit high interpolation.
The ST 127x and ST 307x feature integrated
digitizing and interpolation electronics with
5-fold or 10-fold interpolation (as ordered).
They are transmitted as square-wave signals
in TTL levels.
Mechanical Data
Plunger actuation
Position of plunger at rest
Measuring standard
System accuracy
Reference mark
Measuring range
Gauging force
Compressed air
Radial force
Operating attitude
Vibration 55 Hz to 2 000 Hz
Shock 11 ms
Protection EN 60 529
Operating temperature
Fastening
Weight without cable
Electrical Data
For length gauges
Incremental signals*
Signal period
Recommended measuring step
Mech. permissible traversing speed
Edge separation a at
scanning frequency*/traverse speed
100 kHz † 72 m/min
2)
50 kHz † 60 m/min
25 kHz † 30 m/min
Electrical connection*
Cable outlet*
Cable length
Power supply
* Please select when ordering
r = Reference mark position
s = Beginning of measuring length
ST 1200
ST 3000

























27
ST 1278 « TTL
ST 1288 » 1 V
PP
ST 3078 « TTL
ST 3088 » 1 V
PP
ST 1277 « TTL
ST 1287 » 1 V
PP
ST 3077 « TTL
ST 3087 » 1 V
PP
By measured object
Extended
Pneumatic
Retracted
DIADUR grating on glass; grating period 20 µm
± 1 µm
Approx. 5 mm below upper stop
12 mm 30 mm 12 mm 30 mm
See Gauging Force—Plunger Actuation
– † 2.5 bars
† 0.8 N (mechanically permissible)
Any
† 100 m/s
2
(EN 60 068-2-6)
† 1 000 m/s
2
(EN 60 068-2-27)
IP 64 (for connecting elements see Connecting Elements and Cables)
10 to 40 °C; reference temperature 20 °C
Clamping shank ¬ 8h6
40 g 50 g 40 g 50 g
« TTL
ST 127x
ST 307x
» 1 V
PP
ST 128x
ST 308x
« TTL x 5
4 µm
« TTL x 10
2 µm
» 1 V
PP
20 µm
1 µm
1)
0.5 µm
1)
1 µm/0.5 µm
† 72 m/min

‡ 0.48 µs
‡ 0.98 µs
‡ 1.98 µs
‡ 0.23 µs
‡ 0.48 µs
‡ 0.98 µs

Cable, 1.5 m, with 15-pin D-sub connector
(interface electronics integrated)
Cable 1.5 m with
D-sub connector, 15-pin •
M23 connector, 12 pin •
Axial or radial
† 30 m with HEIDENHAIN cable
5 V DC ± 10 %/< 230 mA (without load) 5 V DC ± 10 %/< 90 mA

1)
After 4-fold evaluation
2)
Mechanically limited
28
Accessories
Measuring Contacts
Ball-type contact
Steel ID 202504-01
Carbide ID 202504-02
Ruby ID 202504-03
Domed contact
Carbide ID 229232-01
Flat contact
Steel ID 270922-01
Carbide ID 202506-01
Pin-type contact
Steel ID 202505-01
Knife-edge contact
Steel ID 202503-01
Roller contact, steel
For a low-friction contact with moving surfaces
Crowned ID 202502-03
Cylindrical ID 202502-04
Adjustable contact, carbide
For exact parallel alignment to the measuring plate surface
Flat ID 202507-01
Knife-edged ID 202508-01

























29
Switch Boxes, Coupling
Switch boxes for CT 2501, CT 6001,
MT 60 M, MT 101 M
Switch boxes are required for length
gauges with motorized plunger actuation.
The plunger is controlled through two push
buttons or by external signal. The gauging
force is adjustable at the SG 25 M and
SG 60 M switch boxes in three stages.
SG 25 M
ID 317436-01
SG 60 M
ID 317436-02
SG 101 V
1)
For the MT 101 M in vertical operation
ID 361140-01
SG 101 H
1)
For the MT 101 M in horizontal operation
ID 361140-02
Connector (female) 3-pin
For external operation of the switch box
ID 340646-05
1)
Separate power supply required
Power adapter for SG 101 V/H
An adapter connected to the switch box
powers the MT 101 M.
Voltage range 100 to 240 V AC
Exchangeable plug adapter (U.S. and Euro
connectors included in delivery)
ID 648029-01
Coupling
For connecting the plunger of the length
gauge (specifically for the MT 60 K,
MT 101 K, CT 2502 and CT 6002) to a
moving machine element
ID 206310-01
30
Accessories for HEIDENHAIN-CERTO
Gauge Stand
Holder for CS 200
For the CT 2501 with ¬ 16 mm clamping
shank
ID 324391-01
No chips or flaws
CS 200 gauge stand
For length gauges CT 2501*
CT 6001
ID 221310-01
Overall height 349 mm
Base ¬ 250 mm
Column ¬ 58 mm
Weight 15 kg
*) With special holder
The flatness of the CS 200 is determined
with the aid of a Fizeau interferometer.

























31
Ceramic Suction Plate, Diaphragm Pump
Ceramic suction plate
Wear-resistant working surface with high
surface quality specifically for inspecting
gauge blocks
ID 223100-01
The gauge block (class 1 or 2)—or any other
object with a plane surface—is drawn by
suction onto the top of the ceramic plate.
The ceramic plate is likewise drawn to the
granite base and held in place through
negative gauge pressure.
Parts for connecting the ceramic suction
plate with the diaphragm pump are among
the items supplied:
Pressure tubing 3 m
T-joint
Connecting piece
Diaphragm pump
Source of suction for drawing the measured
object and ceramic suction plate
Power consumption 20 W
Weight 2.3 kg
Line voltage 230 V AC/50 Hz
ID 754220-01
Line voltage 115 V AC/60 Hz
ID 754220-02
32
Accessories for ACANTO, HEIDENHAIN-METRO and
HEIDENHAIN-SPECTO Cable-Type Lifter, Gauge Stands
Cable lifter
For manual plunger actuation of MT 1200
and MT 2500.
The integral pneumatic damping reduces
the plunger extension speed to prevent
rebounding, for example on very hard
materials.
ID 257790-01
MS 200 gauge stand
For length gauges AT
1)
ST
1)
MT 1200
1)
MT 2500
1)
MT 60 M
MT 101 M
ID 244154-01
Overall height 346 mm
Base ¬ 250 mm
Column ¬ 58 mm
Weight 18 kg
1)
With special holder
Holder for MS 200
For mounting the length gauges
with ¬ 8 mm clamping shank,
e.g. AT, ST, MT 1200, MT 2500
ID 324391-02
Clamping sleeve
For length gauges AT, ST
MT 1200
MT 2500
For fixing the length gauge reliably without
overloading the 8h6 clamping shank.
Consisting of:
Sleeve, clamping screw
ID 386811-01 (1 unit per package)
ID 386811-02 (10 units per package)

























33
MS 45 gauge stand
For length gauges AT,
ST
MT 1200
MT 2500
ID 202162-02
Overall height 196.5 mm
Base ¬ 49 mm
Column ¬ 22 mm
Weight 2.2 kg
MS 100 gauge stand
For length gauges AT,
ST
MT 1200
MT 2500
MT 60 M
1)
MT 101 M
1)
ID 202164-02
Overall height 385 mm
Measuring plate 100 mm x 115 mm
Column ¬ 50 mm
Weight 18 kg
1)
With special holder
Holder for MS 100
For mounting the MT 60 M
ID 207479-01
For mounting the MT 101 M
ID 206260-01
34
ND 200
Digital readout for one axis
HEIDENHAIN encoders with 11 µA
PP
or
1 V
PP
signals and EnDat 2.2 interface can
be connected to the digital readouts of the
ND 200 series. The ND 280 readout provides
the basic functions for simple measuring
tasks. The ND 287 also features other
functions such as sorting and tolerance check
mode, minimum/maximum value storage,
measurement series storage. It calculates
the mean value and standard deviations
and creates histograms and control charts.
The ND 287 permits optional connection of
a second encoder for sum/difference
measurement or of an analog sensor.
The ND 28x units have serial interfaces for
measured value transfer.
For more information, see the Digital
Readouts/Linear Encoders brochure.
ND 280 ND 287
Encoder input
1)
1 x » 11 µA
PP,
» 1 V
PP
or EnDat 2.2
Connection D-sub, 15-pin, female
Input frequency » 1 V
PP
: † 500 kHz; 11 µA
PP
: † 100 kHz
Signal subdivision Up to 4 096-fold (adjustable)
Display step (adjustable) Linear axis: 0.5 to 0.002 µm
Angular axis: 0.5° to 0.000 01° and/or 00°00’00.1”
Functions REF reference mark evaluation •
2 datums •
– Sorting and tolerance checking •
Measurement series •
(max. 10 000 measured values)
Minimum/maximum value storage •
Statistics functions •
Sum/difference display (option) •
Switching I/O – Yes
Interface RS-232-C/V.24; USB (UART); Ethernet (option for ND 287)
1)
Automatic detection of interface
Digital Readouts
ND 2100 G GAGE-CHEK
Input signals* » 1 V
PP
«TTL EnDat 2.2
Encoder inputs D-sub (15-pin) male D-sub (9-pin) male M12 flange socket
(8-pin) female
Number of inputs* ND 2104 G: 4
ND 2108 G: 8
Signal evaluation/subdivision 10-fold 4-fold –
Display 5.7“ color flat-panel display
Functions Part programming of up to 100 parts •
Sorting and tolerance checking using tolerance and •
warning limits
Measurement series with MIN/MAX display •
Mathematical and trigonometric formulas, logical •
operations
Functions for statistical process control (SPC) •
Graphic display (measurement results, distribution) •
Data storage of values and formulas •
Switching I/O Yes
Interface RS-232-C/V.24 •
USB •
ND 2100 G GAGE-CHEK
Digital Readouts
The ND 2100 G GAGE-CHEK readouts are
versatile metrology displays for measuring
and inspection tasks in manufacturing and
quality assurance. With inputs for up to
eight encoders, they are predestined for
multipoint measurements from simple
pass/fail detection up to complex SPC
evaluation.
For more information see Digital Readouts
for Metrology Applications brochure

























35
EIB 741
Encoder inputs
switchable
» 1 V
PP
EnDat 2.1 EnDat 2.2
Connection Four D-sub connections (15-pin, female)
Input frequency † 500 kHz –
Signal subdivision 4 096-fold –
Internal memory Typically 250 000 position values per input
Interface Ethernet as per IEEE 802.3 († 1 gigabit)
Driver software and
demo program
For Windows, Linux, LabView
Program examples
EIB 741
External interface box
The EIB 741 is ideal for applications requiring
high resolution, fast measured-value
acquisition, mobile data acquisition or data
storage.
Up to four incremental or absolute
HEIDENHAIN encoders can be connected
to the EIB 741. The data is output over a
standard Ethernet interface.
For more information, see the EIB 741
Product Information sheet.
Evaluation Electronics
MSE 1000
Modular Electronic Unit for Multipoint
Inspection Apparatuses
The MSE 1000 of HEIDENHAIN is a higher
level electronics unit in modular design for
multipoint inspection apparatuses. The
individual modules permit connection of
incremental, absolute and analog
measurands, the output of switch signals,
and communication over diverse interfaces.
In all, up to 250 axes or channels can be
configured. This gives it the flexibility
required to adapt to differing operating
conditions.
In its basic configuration, the MSE 1000
consists of a power module and a basic
module. It can be expanded by further
modules as needed.
For more information, see the MSE 1000
Product Information sheet.
MSE 1000
Measuring channels/axes Up to 250
Modules Basic Ethernet 10/100 to the PC •
Four encoder inputs with EnDat 2.2, TTL or 1 V •
PP
Switching input TTL •
Power supply 100 to 240 V AC or 24 V DC
EnDat 4 or 8 EnDat-2.2 encoder inputs
Sinusoidal 4 or 8 encoder inputs with 1 V
PP
Square wave 4 or 8 TTL encoder inputs
Analog Two analog inputs
I/O 4 relay outputs and 4 switching inputs TTL
Compressed air Air switch for pneumatic length gauges
Mounting On top hat rail on mounting stand or in electrical cabinets
Software MSEsetup •
Ethernet driver •
Interface Standard Ethernet, IEEE 802.3
Sample units immediately available; series production planned for 3rd quarter 2012
Windows is a registered trademark of the Microsoft Corporation.
36
IK 220
Universal PC counter card
The IK 220 is an expansion board for PCs
for recording the measured values of two
incremental or absolute HEIDENHAIN
encoders. The subdivision and counting
electronics subdivide the sinusoidal input
signals 4 096-fold. A driver software package
is included in delivery.
IK 220
Encoder inputs
switchable
» 1 V
PP
» 11 µA
PP
EnDat 2.1 SSI
Connection Two D-sub connections (15-pin, male)
Input frequency † 500 kHz † 33 kHz –
Signal subdivision 4 096-fold –
Internal memory 8 192 position values per input
Interface PCI bus (plug and play)
Driver software and
demo program
For Windows 2000/XP/Vista/7
in VISUAL C++, VISUAL BASIC and BORLAND DELPHI
For more information, see the IK 220
Product Information sheet.

























37
Pin Layout
9-pin
HEIDENHAIN connector
15-pin D-sub connector
For ND 28x/PWM 20 or on encoder
Power supply Incremental signals
3 4
Housing
9 1 2 5 6 7 8
4 2 6 1 9 3 11 14 7
U
P
0 V External
shield
Internal
shield
I
1
+ I
1
– I
2
+ I
2
– I
0
+ I
0

Brown White – White/
Brown
Green Yellow Blue Red Gray Pink
U
P
= Power supply
Vacant pins or wires must not be used!
Shield on housing.
Color assignment applies only to extension cable.
Interfaces
Incremental Signals » 11 µA
PP
HEIDENHAIN encoders with »11 µA
PP

interface provide current signals.
They are intended for connection to ND
position display units or EXE pulse-shaping
electronics from HEIDENHAIN.
The sinusoidal incremental signals I
1
and
I
2
are phase-shifted by 90° elec. and have
signal levels of approx. 11 µA
PP
.
The illustrated sequence of output
signals—I
2
lagging I
1
—applies for the
retracting plunger.
The reference mark signal I
0
has a usable
component G of approx. 5.5 µA.
The data on signal amplitude apply when
the power supply given in the Specifications
is connected at the encoder. They refer to
a differential measurement between the
associated outputs. The signal amplitude
decreases with increasing frequency. The
cutoff frequency indicates the scanning
frequency at which a certain percentage of
the original signal amplitude is maintained:
–3 dB cutoff frequency: •
70 % of the signal amplitude
–6 dB cutoff frequency: •
50 % of the signal amplitude
Interpolation/resolution/measuring step
The output signals of the 11 µA
PP
interface
are usually interpolated in the subsequent
electronics in order to attain sufficiently
high resolutions.
Measuring steps for position measurement
are recommended in the Specifications.
For special applications, other resolutions
are also possible.
Interface Sinusoidal current signals » 11 µA
PP
Incremental signals 2 nearly sinusoidal signals I
1
and I
2
Signal amplitude M: 7 to 16 µA
PP
/typically 11 µA
PP
Asymmetry IP – NI/2M: † 0.065
Amplitude ratio M
A
/M
B
: 0.8 to 1.25
Phase angle Iϕ1 + ϕ2I/2: 90° ± 10° elec.
Reference-mark
signal
1 or several signal peaks I
0
Usable component G: 2 to 8.5 µA
Switching threshold E, F: ‡ 0.4 µA
Zero crossovers K, L: 180° ± 90° elec.
Connecting cable
Cable length
Propagation time
Shielded HEIDENHAIN cable
PUR [3(2 · 0.14 mm
2
) + (2 · 1 mm
2
)]
Max. 30 m with 90 pF/m distributed capacitance
6 ns/m
Signal period
360° elec.
(rated value)
38
Signal period
360° elec.
(rated value)
A, B, R measured with oscilloscope in differential mode
Cutoff frequency
Typical signal amplitude
curve with respect to
the scanning frequency
S
i
g
n
a
l

a
m
p
l
i
t
u
d
e

[
%
]
f
Scanning frequency [kHz]f
–3 dB cutoff frequency
–6 dB cutoff frequency
Interfaces
Incremental Signals » 1 V
PP
HEIDENHAIN encoders with »1 V
PP

interface provide voltage signals that can
be highly interpolated.
The sinusoidal incremental signals A and
B are phase-shifted by 90° elec. and have
amplitudes of typically 1 V
PP.
The illustrated
sequence of output signals—with B
lagging A—applies for the direction of
motion shown in the dimension drawing.
The reference mark signal R has a usable
component G of approx. 0.5 V. Next to the
reference mark, the output signal can be
reduced by up to 1.7 V to a quiescent
value H. This must not cause the subsequent
electronics to overdrive. Even at the
lowered signal level, signal peaks with the
amplitude G can also appear.
The data on signal amplitude apply when
the power supply given in the specifications
is connected to the encoder. They refer to a
differential measurement at the 120 ohm
terminating resistor between the associated
outputs. The signal amplitude decreases with
increasing frequency. The cutoff frequency
indicates the scanning frequency at which a
certain percentage of the original signal
amplitude is maintained:
–3 dB • ƒ 70 % of the signal amplitude
–6 dB • ƒ 50 % of the signal amplitude
The data in the signal description apply to
motions at up to 20% of the –3 dB-cutoff
frequency.
Interpolation/resolution/measuring step
The output signals of the 1 V
PP
interface
are usually interpolated in the subsequent
electronics in order to attain sufficiently
high resolutions. For velocity control,
interpolation factors are commonly over
1000 in order to receive usable velocity
information even at low speeds.
Measuring steps for position measurement
are recommended in the specifications.
For special applications, other resolutions
are also possible.
Short-circuit stability
A temporary short circuit of one signal
output to 0 V or U
P
(except encoders with
U
Pmin
= 3.6 V) does not cause encoder
failure, but it is not a permissible operating
condition.
Short circuit at 20 °C 125 °C
One output < 3 min < 1 min
All outputs < 20 s < 5 s
Interface Sinusoidal voltage signals » 1 V
PP
Incremental signals 2 nearly sinusoidal signals A and B
Signal amplitude M: 0.6 to 1.2 V
PP
; typically 1 V
PP
Asymmetry |P – N|/2M: † 0.065
Amplitude ratio M
A
/M
B
: 0.8 to 1.25
Phase angle Iϕ1 + ϕ2I/2: 90° ± 10° elec.
Reference-mark
signal
One or several signal peaks R
Usable component G: ‡ 0.2 V
Quiescent value H: † 1.7 V
Switching threshold E, F: 0.04 to 0.68 V
Zero crossovers K, L: 180° ± 90° elec.
Connecting cable
Cable length
Propagation time
Shielded HEIDENHAIN cable
PUR [4(2 x 0.14 mm
2
) + (4 x 0.5 mm
2
)]
Max. 150 m at 90 pF/m distributed capacitance
6 ns/m
These values can be used for dimensioning of the subsequent electronics. Any limited
tolerances in the encoders are listed in the specifications. For encoders without integral
bearing, reduced tolerances are recommended for initial operation (see the mounting
instructions).
Alternative
signal shape

























39
Input Circuitry of
the Subsequent Electronics
Dimensioning
Operational amplifier MC 34074
Z
0
= 120 −
R
1
= 10 k− and C
1
= 100 pF
R
2
= 34.8 k− and C
2
= 10 pF
U
B
= ±15 V
U
1
approx. U
0
–3 dB cutoff frequency of circuitry
Approx. 450 kHz
Approx. 50 kHz with C
1
= 1000 pF
and C
2
= 82 pF
The circuit variant for 50 kHz does reduce
the bandwidth of the circuit, but in doing
so it improves its noise immunity.
Circuit output signals
U
a
= 3.48 V
PP
typically
Gain 3.48
Monitoring of the incremental signals
The following thresholds are recommended
for monitoring of the signal level M:
Lower threshold: 0.30 V
PP
Upper threshold: 1.35 V
PP
Incremental signals
Reference-mark signal
R
a
< 100 −,
typically 24 −
C
a
< 50 pF
ΣI
a
< 1 mA
U
0
= 2.5 V ± 0.5 V
(relative to 0 V of the
power supply)
Encoder Subsequent electronics
Pin Layout
12-pin coupling, M23 12-pin connector, M23 15-pin D-sub connector
For ND 28x/PWM 20 or on encoder
Power supply Incremental signals Other signals
12 2 10 11 5 6 8 1 3 4 9 7 /
4 12 2 10 1 9 3 11 14 7 5/6/8/15 13 /
U
P
Sensor
U
P
0 V Sensor
0 V
A+ A– B+ B– R+ R– Vacant Vacant Vacant
Brown/
Green
Blue White/
Green
White Brown Green Gray Pink Red Black / Violet Yellow
Shield on housing; U
P
= power supply voltage
Sensor: The sensor line is connected in the encoder with the corresponding power line.
Vacant pins or wires must not be used!
Color assignment applies only to extension cable.
40
Interfaces
Incremental Signals « TTL
HEIDENHAIN encoders with « TTL
interface incorporate electronics that digitize
sinusoidal scanning signals with or without
interpolation.
The incremental signals are transmitted as
the square-wave pulse trains U
a1
and U
a2
,
phase-shifted by 90° elec. The reference
mark signal consists of one or more
reference pulses U
a0
, which are gated with
the incremental signals. In addition, the
integrated electronics produce their inverted
signals , £ and ¤ for noise-proof
transmission. The illustrated sequence of
output signals—with U
a2
lagging U
a1

applies to the direction of motion shown in
the dimension drawing.
The fault-detection signal ¥ indicates
fault conditions such as breakage of the
power line or failure of the light source. It
can be used for such purposes as machine
shut-off during automated production.
The distance between two successive
edges of the incremental signals U
a1
and
U
a2
through 1-fold, 2-fold or 4-fold evaluation
is one measuring step.
The subsequent electronics must be
designed to detect each edge of the
square-wave pulse. The minimum edge
separation a listed in the Specifications
applies for the illustrated input circuitry
with a cable length of 1 m, and refers to
measurement at the output of the
differential line receiver. Cable-dependent
differences in the propagation times
additionally reduce the edge separation by
0.2 ns per meter of cable. To prevent
counting errors, design the subsequent
electronics to process as little as 90 % of
the resulting edge separation.
The max. permissible shaft speed or
traversing velocity must never be
exceeded.
The permissible cable length for
transmission of the TTL square-wave signals
to the subsequent electronics depends on
the edge separation a. It is at most 100 m,
or 50 m for the fault detection signal. This
requires, however, that the power supply
(see Specifications) be ensured at the
encoder. The sensor lines can be used to
measure the voltage at the encoder and, if
required, correct it with an automatic control
system (remote sense power supply).
Interface Square-wave signals « TTL
Incremental signals 2 square-wave signals U
a1
, U
a2
and their inverted signals

Reference-mark
signal
Pulse width
Delay time
1 or more TTL square-wave pulses U
a0
and their inverted
pulses ¤
90° elec. (other widths available on request)
|t
d
| † 50 ns
Fault-detection
signal
Pulse width
1 TTL square-wave pulse ¥
Improper function: LOW (upon request: U
a1
/U
a2
high impedance)
Proper function: HIGH
t
S
‡ 20 ms
Signal amplitude Differential line driver as per EIA standard RS-422
U
H
‡ 2.5 V at –I
H
= 20 mA ERN 1x23: 10 mA
U
L
† 0.5 V at I
L
= 20 mA ERN 1x23: 10 mA
Permissible load Z
0
‡ 100 − Between associated outputs
|I
L
| † 20 mA Max. load per output (ERN 1x23: 10 mA)
C
load
† 1000 pF With respect to 0 V
Outputs protected against short circuit to 0 V
Switching times
(10% to 90%)
t
+
/ t

† 30 ns (typically 10 ns)
with 1 m cable and recommended input circuitry
Connecting cable
Cable length
Propagation time
Shielded HEIDENHAIN cable
PUR [4(2 × 0.14 mm
2
) + (4 × 0.5 mm
2
)]
Max. 100 m (¥ max. 50 m) at distributed capacitance 90 pF/m
6 ns/m
Signal period 360° elec.
Fault
Measuring step after
4-fold evaluation
Inverse signals , £, ¤ are not shown
Permissible
cable length
with respect to the
edge separation
C
a
b
l
e

l
e
n
g
t
h

[
m
]

f
Edge separation [µs] f
Without ¥
With ¥

























41
Pin Layout
15-pin
D-sub connector
12-pin
HEIDENHAIN
connector
Power supply Incremental signals Other signals
12 2 10 11 5 6 8 1 3 4 7 / 9
4 12 2 10 1 9 3 11 14 7 13 5/6/8 15
U
P
Sensor
U
P
0 V Sensor
0 V
U
a1
U
a2
£ U
a0
¤ ¥
1)
Vacant Vacant
2)
Brown/
Green
Blue White/
Green
White Brown Green Gray Pink Red Black Violet – Yellow
Shield on housing; U
P
= power supply voltage
Sensor: The sensor line is connected in the encoder with the corresponding power line.
1)
ERO 14xx: Vacant
2)
Exposed linear encoders: Switchover TTL/11 µA
PP
for PWT
Vacant pins or wires must not be used!
Color assignment applies only to extension cable.
Input Circuitry of
the Subsequent Electronics
Dimensioning
IC
1
= Recommended differential
line receiver
DS 26 C 32 AT
Only for a > 0.1 µs:
AM 26 LS 32
MC 3486
SN 75 ALS 193
R
1
= 4.7 k−
R
2
= 1.8 k−
Z
0
= 120 −
C
1
= 220 pF (serves to improve
noise immunity)
Incremental signals
Reference-mark signal
Fault-detection signal

Encoder Subsequent electronics
42
Interfaces
Absolute Position Values
Interface EnDat serial bidirectional
Data transfer Absolute position values, parameters and additional information
Data input Differential line receiver according to EIA standard RS 485 for the
signals CLOCK, CLOCK, DATA and DATA
Data output Differential line driver according to EIA standard RS 485 for DATA
and DATA signals.
Position values Ascending during traverse in direction of arrow (see dimensions
of the encoders)
Incremental signals » 1 V
PP
(see Incremental signals 1 V
PP
) depending on the unit
The EnDat interface is a digital, bidirectional
interface for encoders. It is capable both of
transmitting position values as well as
transmitting or updating information stored
in the encoder, or saving new information.
Thanks to the serial transmission method,
only four signal lines are required. The data
is transmitted in synchronism with the
clock signal from the subsequent electronics.
The type of transmission (position values,
parameters, diagnostics, etc.) is selected
through mode commands that the
subsequent electronics send to the encoder.
Some functions are available only with
EnDat 2.2 mode commands.
For more information, refer to the
EnDat Technical Information sheet or visit
www.endat.de.
Position values can be transmitted with or
without additional information (e.g. position
value 2, temperature sensors, diagnostics,
limit position signals).
Besides the position, additional information
can be interrogated in the closed loop and
functions can be performed with the
EnDat 2.2 interface.
Parameters are saved in various memory
areas, e.g.:
Encoder-specific information •
Information of the OEM (e.g. “electronic •
ID label” of the motor)
Operating parameters (datum shift, •
instruction, etc.)
Operating status (alarm or warning •
messages)
Monitoring and diagnostic functions
of the EnDat interface make a detailed
inspection of the encoder possible.
Error messages •
Warnings •
Online diagnostics based on valuation •
numbers (EnDat 2.2)
Incremental signals
EnDat encoders are available with or
without incremental signals. EnDat 21 and
EnDat 22 encoders feature a high internal
resolution. An evaluation of the incremental
signal is therefore unnecessary.
Clock frequency and cable length
The clock frequency is variable—depending
on the cable length (max. 150 m)—between
100 kHz and 2 MHz. With propagation-delay
compensation in the subsequent electronics,
clock frequencies up to 16 MHz at cable
lengths up to 100 m are possible (for other
values see Specifications).
Ordering
designation
Command set Incremental
signals
Power supply
EnDat 01 EnDat 2.1
or EnDat 2.2
With See specifications
of the encoder
EnDat 21 Without
EnDat 02 EnDat 2.2 With Expanded range
3.6 to 5.25 V DC
or 14 V DC EnDat 22 EnDat 2.2 Without
Versions of the EnDat interface (bold print indicates standard versions)

C
a
b
l
e

l
e
n
g
t
h

[
m
]

f
Clock frequency [kHz]f
EnDat 2.1; EnDat 2.2 without propagation-delay compensation
EnDat 2.2 with propagation-delay compensation
Absolute encoder Subsequent electronics
» 1 V
PP
A*)
» 1 V
PP
B*)
Operating
parameters
Operating
status
Parameters
of the OEM
Parameters of the encoder
manufacturer for
EnDat 2.1 EnDat 2.2
*) Depends on
encoder
Absolute
position value E
n
D
a
t

i
n
t
e
r
f
a
c
e
Incremental
signals *)

























43
Input Circuitry of Subsequent
Electronics
Dimensioning
IC
1
= RS 485 differential line receiver
and driver
C
3
= 330 pF
Z
0
= 120 −
Data transfer
Incremental signals
Depending on encoder
Encoder Subsequent electronics
1 V
PP
Pin Layout
8-pin coupling, M12 15-pin D-sub connector, male
For IK215/PWM 20
Power supply Absolute position values
8 2 5 1 3 4 7 6
4 12 2 10 5 13 8 15
U
P
Sensor U
P
0 V Sensor 0 V DATA DATA CLOCK CLOCK
Brown/Green Blue White/Green White Gray Pink Violet Yellow
M23
M23
M23
M23
M23
44
The pins on connectors are numbered in
the direction opposite to those on couplings
or flange sockets, regardless of whether
the connecting elements are
male or
female contacts.

When engaged, the connections are
protected to IP 67 (D-sub connector: IP 50;
EN 60 529). When not engaged, there is no
protection.
Cables and Connecting Elements
General Information
Connector (insulated): A connecting
element with a coupling ring. Available
with male or female contacts.
Symbols
Coupling insulated:
Connecting element with external thread;
available with male or female contacts.
Symbols
D-sub connector: for HEIDENHAIN
controls, counters and IK absolute value
cards
Symbols
Accessories for flange sockets and
M23 mounted couplings
Bell seal
ID 266526-01
Threaded metal dust cap
ID 219926-01
Flange socket: Permanently mounted on
the encoder or a housing, with external
thread (like a coupling), available with
male or female contacts.
Symbols
Mounted coupling
with central fastening
Mounted coupling
with flange
Cutout for mounting
1)
With integrated interpolation electronics

























45
12-pin 9-pin
Mating element on connecting cable to
connector on encoder cable
Coupling (female) for cable ¬ 8 mm


291698-02 291698-01
Connector on connecting cable for
connection to subsequent electronics
Connector (male) For cable with ¬ 8 mm

291697-08 291697-04
Coupling on connecting cable Coupling (male) for cable ¬ 8 mm

291698-04 291698-24
Flange socket for mounting on
subsequent electronics
Flange socket (female)

315892-08 315892-06

Mounted couplings

With flange (female) ¬ 8 mm

291698-07 291698-06
With flange (male) ¬ 8 mm

291698-31 –
With central fastener (male) ¬ 6 to 10 mm

741045-01 –

Adapter » 1 V
PP
/11 µA
PP
For converting the 1 V
PP
signals to 11 µA
PP
;
12-pin M23 connector (female) and 9-pin
M23 connector (male)
364914-01 –
Connecting Elements
15-pin
Connector on connecting cable to
connector on encoder cable
D-sub connector, female for cable ¬ 8 mm 315650-14
46
Connecting Cables 1 V
PP
, TTL, 11 µA
PP
12-Pin 9-Pin
M23 M23
1 V
PP
, TTL 11 µA
PP
PUR connecting cable [3(2 x 0.14 mm
2
) + (2 x 1 mm
2
)]
PUR connecting cable [6(2 x 0.19 mm
2
)]
PUR connecting cable [4(2 x 0.14 mm
2
) + (4 x 0.5 mm
2
)] ¬ 8 mm ¬ 6 mm
1)
¬ 8 mm
Complete with D-sub connector (female)
and M23 connector (male)
331693-xx 355215-xx –
With one D-sub connector (female),
15-pin
332433-xx 355209-xx –
Complete with D-sub connector (female)
and connector (male), 15-pin
for ND 28x, EIB 741;
only 1 V
PP
: ND 11xx, ND 12xx
335074-xx 355186-xx 738681-xx
Complete with D-sub connector (female)
and D-sub connector (female), 15-pin,
for ND 780, PT 880, IK 220
335077-xx 349687-xx –
Cable only 244957-01 291639-01 –
Complete
with M23 coupling (female) and
D-sub connector (male), 15-pin
for ND 28x, EIB 741;
only 1 V
PP
: ND 11xx, ND 12xx
309784-xx – 653231-xx
Complete
with M23 coupling (female) and
D-sub connector (male), 19-pin
for ND 11xx, ND 12xx (not 1 V
PP
)
617513-xx – 716905-xx
Complete
with M23 coupling (female) and
D-sub connector (female), 15-pin,
for ND 780, PT 880, IK 220
309783-xx – 368172-xx
With one connector
with M23 coupling (female)
298402-xx – 309780-xx
Complete
with M23 coupling (female) and
M23 connector (male)
298400-xx – 309774-xx
1)
Cable length max. 9 m

























47
EnDat without incremental signals
PUR connecting cable [4 × 2 × 0.09 mm
2
]
PUR connecting cable [(4 × 0.14 mm
2
) + (4 × 0.34 mm
2
)] ¬ 6 mm ¬ 3.7 mm
Complete with connector (female) and
coupling (male)
368330-xx 801142-xx
1)
Complete with right-angle connector
(female) and coupling (male)
373289-xx 801149-xx
1)
Complete with connector (female) and
D-sub connector (female), 15-pin,
for TNC (position inputs)
535627-xx –
Complete with connector (female) and
D-sub connector (male), 15-pin,
for IK 215, PWM 20, EIB 741 etc.
524599-xx 801129-xx
1)
Complete with right-angle connector
(female) and D-sub connector (male),
15-pin, for IK 215, PWM 20, EIB 741 etc.
722025-xx 801140-xx
1)
With one connector (female) 634265-xx –
With one right-angle connector, (female) 606317-xx –
1)
Max. cable length 6 m
Connecting Cables EnDat 8-Pin
M12
48
General Electrical Information
Power supply
Connect HEIDENHAIN encoders only to
subsequent electronics whose power
supply is generated from PELV systems
(EN 50 178). In addition, overcurrent
protection and overvoltage protection are
required in safety-related applications.
If HEIDENHAIN encoders are to be
operated in accordance with IEC 61010-1,
power must be supplied from a secondary
circuit with current or power limitation as
per IEC 61010-1:2001, section 9.3 or
IEC 60950-1:2005, section 2.5 or a Class 2
secondary circuit as specified in UL1310.
The encoders require a stabilized DC
voltage U
P
as power supply. The respective
Specifications state the required power
supply and the current consumption. The
permissible ripple content of the DC
voltage is:
High frequency interference •
U
PP
< 250 mV with dU/dt > 5 V/µs
Low frequency fundamental ripple •
U
PP
< 100 mV
The values apply as measured at the
encoder, i.e., without cable influences. The
voltage can be monitored and adjusted
with the encoder’s sensor lines. If a
controllable power supply is not available,
the voltage drop can be halved by
switching the sensor lines parallel to the
corresponding power lines.
Calculation of the voltage drop:
¹U = 2 · 10
–3
·
where ¹U: Voltage drop in V
1.05: Length factor due to
twisted wires
L
C
: Cable length in m
I: Current consumption
in mA
A
P
: Cross section of power
lines in mm
2
The voltage actually applied to the encoder
is to be considered when calculating the
encoder’s power requirement. This
voltage consists of the supply voltage U
P

provided by the subsequent electronics
minus the line drop at the encoder. For
encoders with an expanded supply range,
the voltage drop in the power lines must
be calculated under consideration of the
nonlinear current consumption (see next
page).
Transient response of supply voltage and switch-on/switch-off behavior
Output signals invalid Invalid Valid
U
PP
1.05 · L
C
· I
56 · A
P
If the voltage drop is known, all parameters
for the encoder and subsequent electronics
can be calculated, e.g. voltage at the
encoder, current requirements and power
consumption of the encoder, as well as the
power to be provided by the subsequent
electronics.
Switch-on/off behavior of the encoders
The output signals are valid no sooner than
after the switch-on time t
SOT
= 1.3 s (2 s for
PROFIBUS-DP) (see diagram). During the
time t
SOT
they can have any levels up to
5.5 V (with HTL encoders up to U
Pmax
). If
an interpolation electronics unit is inserted
between the encoder and the power supply,
this unit’s switch-on/off characteristics
must also be considered. If the power
supply is switched off, or when the supply
voltage falls below U
min
, the output signals
are also invalid. During restart, the signal
level must remain below 1 V for the time
t
SOT
before power on. These data apply to
the encoders listed in the catalog—
customer-specific interfaces are not
included.
Encoders with new features and increased
performance range may take longer to
switch on (longer time t
SOT
). If you are
responsible for developing subsequent
electronics, please contact HEIDENHAIN
in good time.
Insulation
The encoder housings are isolated against
internal circuits.
Rated surge voltage: 500 V (preferred
value as per VDE 0110 Part 1, overvoltage
category II, contamination level 2)
Cable Cross section of power supply lines A
P
1 V
PP
/TTL/HTL 11 µA
PP
EnDat/SSI
17-pin
EnDat
5)
8-pin
¬ 3.7 mm 0.05 mm
2
– – 0.09 mm
2
¬ 4.3 mm 0.24 mm
2
– – –
¬ 4.5 mm EPG 0.05 mm
2
– 0.05 mm
2
0.09 mm
2
¬ 4.5 mm
¬ 5.1 mm
0.14/0.09
2)
mm
2
0.05
2), 3)
mm
2
0.05 mm
2
0.05/0.14
6)
mm
2
0.14 mm
2
¬ 5.5 mm PVC 0.1 mm
2
– – –
¬ 6 mm
¬ 10 mm
1)
0.19/0.14
2), 4)
mm
2
– 0.08/0.19
6)
mm
2
0.34 mm
2
¬ 8 mm
¬ 14 mm
1)
0.5 mm
2
1 mm
2
0.5 mm
2
1 mm
2
1)
Metal armor
2)
Rotary encoders
3)
Length gauges
4)
LIDA 400
5)
Also Fanuc, Mitsubishi
6)
RCN, LC adapter cable

























49
Encoders with expanded supply
voltage range
For encoders with expanded supply voltage
range, the current consumption has a
nonlinear relationship with the supply
voltage. On the other hand, the power
consumption follows a linear curve (see
Current and power consumption diagram).
The maximum power consumption at
minimum and maximum supply voltage is
listed in the Specifications. The maximum
power consumption (worst case) accounts
for:
Recommended receiver circuit •
Cable length 1 m •
Age and temperature influences •
Proper use of the encoder with respect •
to clock frequency and cycle time
The typical current consumption at no load
(only supply voltage is connected) for 5 V
supply is specified.
The actual power consumption of the
encoder and the required power output of
the subsequent electronics are measured,
while taking the voltage drop on the supply
lines into consideration, in four steps:
Step 1: Resistance of the supply lines
The resistance values of the supply lines
(adapter cable and encoder cable) can be
calculated with the following formula:
R
L
= 2 ·
Step 2: Coefficients for calculation of
the drop in line voltage
b = –R
L
· – U
P
c = P
Emin
· R
L
+ · R
L
· (U
P
– U
Emin
)
Step 3: Voltage drop based on the
coefficients b and c
¹U = –0.5 · (b + ¹b
2
– 4 · c)
Step 4: Parameters for subsequent
electronics and the encoder
Voltage at encoder:
U
E
= U
P
– ¹U
Current requirement of encoder:
I
E
= ¹U / R
L

Power consumption of encoder:
P
E
= U
E
· I
E

Power output of subsequent electronics:
P
S
= U
P
· I
E
1.05 · L
C
56 · A
P
Supply voltage [V]
Supply voltage [V]
P
o
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r

o
u
t
p
u
t

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f

s
u
b
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e
q
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t

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c
t
r
o
n
i
c
s

(
n
o
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m
a
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i
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d
)
Encoder cable/adapter cable Total Connecting cable
P
o
w
e
r

c
o
n
s
u
m
p
t
i
o
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r

c
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(
n
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a
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)
Power consumption of encoder
(normalized to value at 5 V)
Current requirement of encoder
(normalized to value at 5 V)
Where:
U
Emax
,
U
Emin
: Minimum or maximum supply
voltage of the encoder in V
P
Emin
,
P
Emax
: Maximum power consumption at
minimum or maximum power
supply, respectively, in W
U
P
: Supply voltage of the subsequent
electronics in V
R
L
: Cable resistance (for both
directions) in ohms
¹U: Voltage drop in the cable in V
1.05: Length factor due to twisted wires
L
C
: Cable length in m
A
P
: Cross section of power lines
in mm
2
Influence of cable length on the power output of the subsequent
electronics (example representation)
Current and power consumption with respect to the supply voltage
(example representation)
P
Emax
– P
Emin
U
Emax
– U
Emin
P
Emax
– P
Emin
U
Emax
– U
Emin
50
Rigid configuration
Frequent flexing
Frequent flexing
Cable Bend radius R
Rigid configuration Frequent flexing
¬ 3.7 mm ‡ 8 mm ‡ 40 mm
¬ 4.3 mm ‡ 10 mm ‡ 50 mm
¬ 4.5 mm EPG ‡ 18 mm –
¬ 4.5 mm
¬ 5.1 mm
¬ 5.5 mm PVC
‡ 10 mm ‡ 50 mm
¬ 6 mm
¬ 10 mm
1)
‡ 20 mm
‡ 35 mm
‡ 75 mm
‡ 75 mm
¬ 8 mm
¬ 14 mm
1)
‡ 40 mm
‡ 100 mm
‡ 100 mm
‡ 100 mm
1)
Metal armor
Cable
For safety-related applications, use
HEIDENHAIN cables and connectors.
Versions
The cables of almost all HEIDENHAIN
encoders and all adapter and connecting
cables are sheathed in polyurethane (PUR
cables). Many adapter cables for within
motors and a few cables on encoders are
sheathed in a special elastomer (EPG).
Many adapter cables within the motor
consist of TPE wires (special thermoplastic)
in braided sleeving. Individual encoders
feature cable with a sleeve of polyvinyl
chloride (PVC). This cables are identified in
the catalog as EPG, TPE or PVC.
Durability
PUR cables are resistant to oil in accordance
with VDE 0472 (Part 803/test type B) and
to hydrolysis and microbes in accordance
with VDE 0282 (Part 10). They are free of
PVC and silicone and comply with
UL safety directives. The UL certification
“AWM STYLE 20963 80 °C 30 V E63216”
is documented on the cable.
EPG cables are resistant to oil in accordance
with VDE 0472 (Part 803/test type B) and
to hydrolysis in accordance with VDE 0282
(Part 10). They are free of silicone and
halogens. In comparison with PUR cables,
they are only somewhat resistant to media,
frequent flexing and continuous torsion.
PVC cables are oil resistant. The UL certifi-
cation “AWM E64638 STYLE20789 105C
VW-1SC NIKKO” is documented on the
cable.
TPE wires with braided sleeving are oil
resistant and highly flexible.
Temperature range
Rigid
configuration
Frequent flexing
PUR –40 to 80 °C –10 to 80 °C
EPG
TPE
–40 to 120 °C –
PVC –20 to 90 °C –10 to 90 °C
PUR cables with limited resistance to
hydrolysis and microbes are rated for
up to 100 °C. If needed, please ask for
assistance from HEIDENHAIN Traunreut.
Lengths
The cable lengths listed in the
Specifications apply only for HEIDENHAIN
cables and the recommended input
circuitry of subsequent electronics.
Electrically Permissible Speed/
Traversing Speed
The maximum permissible shaft speed or
traversing velocity of an encoder is derived
from
the • mechanically permissible shaft
speed/traversing velocity (if listed in the
Specifications)
and
the • electrically permissible shaft speed/
traversing velocity.
For encoders with sinusoidal output
signals, the electrically permissible shaft
speed/traversing velocity is limited by
the –3 dB/ –6 dB cutoff frequency or the
permissible input frequency of the
subsequent electronics.
For encoders with square-wave signals,
the electrically permissible shaft speed/
traversing velocity is limited by
– the maximum permissible scanning/
output frequency f
max
of the encoder,
and
– the minimum permissible edge
separation a for the subsequent
electronics.
For angle or rotary encoders
n
max
=
f
max
z
· 60 · 10
3
For linear encoders
v
max
= f
max
· SP · 60 · 10
–3
Where:
n
max
: Elec. permissible speed in min
–1
v
max
: Elec. permissible traversing
velocity in m/min
f
max
: Max. scanning/output frequency of
encoder or input frequency of
subsequent electronics in kHz
z: Line count of the angle or rotary
encoder per 360°
SP: Signal period of the linear encoder
in µm

























51
Noise-Free Signal Transmission
Electromagnetic compatibility/
CE-compliance
When properly installed, and when
HEIDENHAIN connecting cables and cable
assemblies are used, HEIDENHAIN
encoders fulfill the requirements for
electromagnetic compatibility according to
2004/108/EC with respect to the generic
standards for:
Noise immunity EN 61 000-6-2: •
Specifically:
– ESD EN 61 000-4-2
– Electromagnetic fields EN 61 000-4-3
– Burst EN 61 000-4-4
– Surge EN 61 000-4-5
– Conducted disturbances EN 61 000-4-6
– Power frequency
magnetic fields EN 61 000-4-8
– Pulse magnetic fields EN 61 000-4-9
Interference EN 61 000-6-4: •
Specifically:
– For industrial, scientific and medical
equipment (ISM) EN 55 011
– For information technology
equipment EN 55 022
Connect the housings of the encoder, •
connecting elements and subsequent
electronics through the shield of the cable.
Ensure that the shield has complete
contact over the entire surface (360°).
For encoders with more than one electrical
connection, refer to the documentation
for the respective product.
For cables with multiple shields, the •
inner shields must be routed separately
from the outer shield. Connect the inner
shield to 0 V of the subsequent electronics.
Do not connect the inner shields with
the outer shield, neither in the encoder
nor in the cable.
Connect the shield to protective ground •
as per the mounting instructions.
Prevent contact of the shield (e.g. •
connector housing) with other metal
surfaces. Pay attention to this when
installing cables.
Do not install signal cables in the direct •
vicinity of interference sources (inductive
consumers such as contactors, motors,
frequency inverters, solenoids, etc.).
– Sufficient decoupling from
interference-signal-conducting cables
can usually be achieved by an air
clearance of 100 mm or, when cables
are in metal ducts, by a grounded
partition.
– A minimum spacing of 200 mm to
inductors in switch-mode power supplies
is required.
If compensating currents are to be •
expected within the overall system, a
separate equipotential bonding conductor
must be provided. The shield does not
have the function of an equipotential
bonding conductor.
Provide power only from PELV systems •
(EN 50 178) to position encoders.
Provide high-frequency grounding with
low impedance (EN 60 204-1 Chap. EMC).
For encoders with 11 µA •
PP
interface:
For extension cables, use only
HEIDENHAIN cable ID 244955-01.
Overall length: max. 30 m.
Transmission of measuring signals—
electrical noise immunity
Noise voltages arise mainly through
capacitive or inductive transfer. Electrical
noise can be introduced into the system
over signal lines and input or output
terminals.
Possible sources of noise include:
Strong magnetic fields from transformers, •
brakes and electric motors
Relays, contactors and solenoid valves •
High-frequency equipment, pulse •
devices, and stray magnetic fields from
switch-mode power supplies
AC power lines and supply lines to the •
above devices
Protection against electrical noise
The following measures must be taken to
ensure disturbance-free operation:
Use only original HEIDENHAIN cables. •
Consider the voltage drop on supply
lines.
Use connecting elements (such as •
connectors or terminal boxes) with metal
housings. Only the signals and power
supply of the connected encoder may be
routed through these elements.
Applications in which additional signals
are sent through the connecting element
require specific measures regarding
electrical safety and EMC.
Minimum distance from sources of interference
NO HEIDENHAIN Scandinavia AB
7300 Orkanger, Norway
www.heidenhain.no
PH Machinebanks` Corporation
Quezon City, Philippines 1113
E-mail: [email protected]
PL APS
02-489 Warszawa, Poland
www.apserwis.com.pl
PT FARRESA ELECTRÓNICA, LDA.
4470 - 177 Maia, Portugal
www.farresa.pt
RO HEIDENHAIN Reprezentant¸a˘ Romania
Bras¸ov, 500338, Romania
www.heidenhain.ro
RS Serbia − BG
RU OOO HEIDENHAIN
125315 Moscow, Russia
www.heidenhain.ru
SE HEIDENHAIN Scandinavia AB
12739 Skärholmen, Sweden
www.heidenhain.se
SG HEIDENHAIN PACIFIC PTE LTD.
Singapore 408593
www.heidenhain.com.sg
SK KOPRETINA TN s.r.o.
91101 Trencin, Slovakia
www.kopretina.sk
SL Posredništvo HEIDENHAIN
NAVO d.o.o.
2000 Maribor, Slovenia
www.heidenhain-hubl.si
TH HEIDENHAIN (THAILAND) LTD
Bangkok 10250, Thailand
www.heidenhain.co.th
TR T&M Mühendislik San. ve Tic. LTD. S¸TI
·
.
34728 Ümraniye-Istanbul, Turkey
www.heidenhain.com.tr
TW HEIDENHAIN Co., Ltd.
Taichung 40768, Taiwan R.O.C.
www.heidenhain.com.tw
UA Gertner Service GmbH Büro Kiev
01133 Kiev, Ukraine
www.gertnergroup.com
US HEIDENHAIN CORPORATION
Schaumburg, IL 60173-5337, USA
www.heidenhain.com
VE Maquinaria Diekmann S.A.
Caracas, 1040-A, Venezuela
E-mail: [email protected]
VN AMS Co. Ltd
HCM City, Vietnam
E-mail: [email protected]
ZA MAFEMA SALES SERVICES C.C.
Midrand 1685, South Africa
www.heidenhain.co.za
DK TP TEKNIK A/S
2670 Greve, Denmark
www.tp-gruppen.dk
ES FARRESA ELECTRONICA S.A.
08028 Barcelona, Spain
www.farresa.es
FI HEIDENHAIN Scandinavia AB
02770 Espoo, Finland
www.heidenhain.fi
FR HEIDENHAIN FRANCE sarl
92310 Sèvres, France
www.heidenhain.fr
GB HEIDENHAIN (G.B.) Limited
Burgess Hill RH15 9RD, United Kingdom
www.heidenhain.co.uk
GR MB Milionis Vassilis
17341 Athens, Greece
www.heidenhain.gr
HK HEIDENHAIN LTD
Kowloon, Hong Kong
E-mail: [email protected]
HR Croatia − SL
HU HEIDENHAIN Kereskedelmi Képviselet
1239 Budapest, Hungary
www.heidenhain.hu
ID PT Servitama Era Toolsindo
Jakarta 13930, Indonesia
E-mail: [email protected]
IL NEUMO VARGUS MARKETING LTD.
Tel Aviv 61570, Israel
E-mail: [email protected]
IN HEIDENHAIN Optics & Electronics
India Private Limited
Chetpet, Chennai 600 031, India
www.heidenhain.in
IT HEIDENHAIN ITALIANA S.r.l.
20128 Milano, Italy
www.heidenhain.it
JP HEIDENHAIN K.K.
Tokyo 102-0083, Japan
www.heidenhain.co.jp
KR HEIDENHAIN Korea LTD.
Gasan-Dong, Seoul, Korea 153-782
www.heidenhain.co.kr
ME Montenegro − SL
MK Macedonia − BG
MX HEIDENHAIN CORPORATION MEXICO
20235 Aguascalientes, Ags., Mexico
E-mail: [email protected]
MY ISOSERVE Sdn. Bhd
56100 Kuala Lumpur, Malaysia
E-mail: [email protected]
NL HEIDENHAIN NEDERLAND B.V.
6716 BM Ede, Netherlands
www.heidenhain.nl
AR NAKASE SRL.
B1653AOX Villa Ballester, Argentina
www.heidenhain.com.ar
AT HEIDENHAIN Techn. Büro Österreich
83301 Traunreut, Germany
www.heidenhain.de
AU FCR Motion Technology Pty. Ltd
Laverton North 3026, Australia
E-mail: [email protected]
BA Bosnia and Herzegovina − SL
BE HEIDENHAIN NV/SA
1760 Roosdaal, Belgium
www.heidenhain.be
BG ESD Bulgaria Ltd.
Sofia 1172, Bulgaria
www.esd.bg
BR DIADUR Indústria e Comércio Ltda.
04763-070 – São Paulo – SP, Brazil
www.heidenhain.com.br
BY Belarus
GERTNER Service GmbH
50354 Huerth, Germany
www.gertnergroup.com
CA HEIDENHAIN CORPORATION
Mississauga, OntarioL5T2N2, Canada
www.heidenhain.com
CH HEIDENHAIN (SCHWEIZ) AG
8603 Schwerzenbach, Switzerland
www.heidenhain.ch
CN DR. JOHANNES HEIDENHAIN
(CHINA) Co., Ltd.
Beijing 101312, China
www.heidenhain.com.cn
CZ HEIDENHAIN s.r.o.
102 00 Praha 10, Czech Republic
www.heidenhain.cz
DE HEIDENHAIN Vertrieb Deutschland
83301 Traunreut, Deutschland
{ 08669 31-3132
| 08669 32-3132
E-Mail: [email protected]
HEIDENHAIN Technisches Büro Nord
12681 Berlin, Deutschland
{ 030 54705-240
HEIDENHAIN Technisches Büro Mitte
08468 Heinsdorfergrund, Deutschland
{ 03765 69544
HEIDENHAIN Technisches Büro West
44379 Dortmund, Deutschland
{ 0231 618083-0
HEIDENHAIN Technisches Büro Südwest
70771 Leinfelden-Echterdingen, Deutschland
{ 0711 993395-0
HEIDENHAIN Technisches Büro Südost
83301 Traunreut, Deutschland
{ 08669 31-1345
Vollständige und weitere Adressen siehe www.heidenhain.de
For complete and further addresses see www.heidenhain.de
Z
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n

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!

/

F
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d

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f
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!
DR. JOHANNES HEIDENHAIN GmbH
Dr.-Johannes-Heidenhain-Straße 5
83301 Traunreut, Germany
{ +49 8669 31-0
| +49 8669 5061
E-mail: [email protected]
www.heidenhain.de
@@@@@@@@@@@@@
208945-29 · 15 · 3/2012 · F&W · Printed in Germany

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