Agilent AEDL Series Optical Linear
Incremental Encoder
Features
Insensitive to dirt/contamination
Large mounting tolerance
Analog or digital output signals
Self-adhesive mounting profile
Simple and easy assembly
5 2200 mm measuring length
Traversing speed of up to 16 m/s
0.05 m
*
, 0.1
m
*
, 0.5
m, 1 m,
5
m and 10 m resolutions
40 m grating period (pitch)
3 m or 5 m (per meter)
accuracy class
0 C to +55 C temperature range
Single 5V supply
Up to 3 m cable length
Description
The AEDL Series linear
encoders use high technology
transmissive optical encoding
technique to detect linear
motion. There is no mechanical
contact between the scanning
head and the linear scale, thus
eliminating error due to
frictions and alignment errors.
Basically, the encoder consists
of a precision linear glass
scale and a scanning head,
which translate the linear
position into analog and digital
electrical signals. The encoder
can be easily aligned and
installed using the provided
spacer-clip and the self-
adhesive mounting feature.
Using Agilent's Quick StickTM
method, the encoder profile
can be easily adjusted while
the system is aligned to the
machine system. The Quick
StickTM method provides
spacing foam that prevents the
encoder profile from sticking
to the machine base until the
alignment has been performed.
A pair of L-pins (setting pins)
ensured that the scanning head
is fixed at a nominal position
while the linear encoder is
aligned and mounted to the
machine system.
With state of the art
technologies, Agilent's linear
encoders provide an ideal
feedback control to high
precision motion systems. The
linear encoders are available
in two colors, silver or black
anodized.
Applications
The AEDL Series linear
encoder provides linear motion
detection, delivering an
accurate and insensitive
closed-loop control solution.
Typical applications:
XY table positioning
high precision machines
industrial plotter
high-accuracy measurements
linear motors
robotics
electronics assembly and
inspection
Note: Agilent Technologies
encoders are not recommended
for use in safety critical
applications, e.g. life support
systems and critical care
medical equipment. Please
contact sales representative if
more clarification is needed.
ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE.
2
Theory of Operation
Agilent Technologies utilizes an
ultra collimated LED as the
light source for the AEDL
linear encoders, where very
high modulation can be
achieved. A 22-element
photodiode array in the
scanning head detects the
modulated light. A high
technology signal-conditioning
IC is integrated inside the
scanning head. The IC
performs real time phase,
amplitude and offset signal
monitoring, which will correct
any deviation from the
expected mathematical signal
that is caused by
environmental influence.
Consequently, a high purity
sinusoidal signal is available
for interpolation process,
which is performed in the
same IC. A world-class high
precision measurement system
is thus achieved through
Agilent's linear encoders.
Output incremental signal can
be specified as either digital
(RS422) or 1 Vpp analog
sinusoidal when ordering.
Signals of Channel A and
Channel B are 90
e phase-
shifted. Index marks are
periodically spaced at a
distance of 50 mm, or distance
coded at 500 x pitch size*.
Fault detection signal is
activated when improper
operation occurs, such as
power cutoff, loss of light
source or heavy contamination.
This signal can be used to
shut down machine operation
safely, when a failure occurs.
Definitions
Resolution: Smallest movement
detectable by the encoder. It is
normally expressed in units of
distance (e.g. 0.5
m or
100nm).
Accuracy: A measure of how
close the output is to where it
should be. It is usually
expressed in units of distance
over the scale length (e.g. +/-
3
m per meter) or a percent
of nominal resolution.
Interpolation: An electronic
technique for increasing the
resolution from the optical
cycles on the linear scale to a
higher number of quadrature
square waves per unit length.
These square waves can then
be further quadrature decoded.
Quadrature: This term refers
to the 90-electrical-degree (1/4
of a cycle) phase relationship
between the A and B channels
of incremental encoder output.
Quadrature Decode: Also
known as 4X Decode, it refers
to the common practice of
counting all 4 quadrature
states (or square wave
transitions) per cycle of
quadrature square waves.
Thus, a linear encoder with a
cycle width of 40
m, for
example, has a resolution of
1 0
m.
Pitch: Also known as grating
or optical period, it refers to
the distance for a single
window-bar pair on the linear
scale.
Measurement Length (ML):
The effective measurement
length that the encoder system
can be used for.
Index Signal: A once-per-scale
output or multiple outputs at
certain fixed locations. It is
used to establish a reference
to a known home or starting
position. Also known as
reference mark, home, or Z.
* Note: 0.05
m and 0.1 m are future options,
which are not yet available. The resolutions
stated are after interpolation and users'
quadrature decoding. Distance-coded version
will be available as a future option.
3
Outline Drawing
Description
A
Start of measuring length
B
Distance between the mounting screw holes
C
Cable diameter
D
Overall length of measuring system (ML + 34 mm)
E
Mounting surface with high strength adhesive tape type TESA 4965
F
Output signal (RS422A digital or analog 1 Vpp)
G
Initial position of scanning head when ready for installation (available on the opposite side upon request)
H
Mounting surface to machine parts
Tape Mounting Version
A
C
B
D
E
H
G
F
4
12-pin Round Connector
15-pin D-Sub Connector (male)
PIN
Analog (1 V
PP
)
Digital RS 422
Cable color
1
Cosine negative, U
2-
Channel B negative, Z
2-
Pink
2
Power supply, +5V
Power supply, +5V
White/Green
3
Index Positive, U
0+
Index positive, Z
0+
Red
4
Index negative, U
0-
Index negative, Z
0-
Black
5
Sine positive, U
1+
Channel A positive, Z
1+
Brown
6
Sine negative, U
1-
Channel A negative, Z
1-
Green
7
NC
Error, active low
Purple
8
Cosine positive, U
2+
Channel B positive, Z
2+
Grey
9
NC
Error, active high
Yellow
10
0V
0V
Brown/Green
11
0V
0V
-
12
+5V
+5V
-
Shell
Shield
Shield
-
PIN
Analog (1 V
PP
)
Digital RS 422
Cable color
1
NC
NC
-
2
NC
NC
-
3
NC
Error , active low
Purple
4
Index negative, U
0-
Index negative, Z
0-
Black
5
Cosine negative, U
2-
Channel B negative, Z
2-
Pink
6
Sine negative, U
1-
Channel A negative, Z
1-
Green
7
NC
NC
-
8
Power supply, +5V
Power supply, +5V
White/Green
9
0V
0V
Brown/Green
10
NC
Switch
White
11
NC
Error, active high
Yellow
12
Index Positive, U
0+
Index positive, Z
0+
Red
13
Cosine positive, U
2+
Channel B positive, Z
2+
Grey
14
Sine positive, U
1+
Channel A positive, Z
1+
Brown
15
NC
NC
Blue
Shell
Shield
Shield
-
Connector Pin Configuration
Four options of connector types are available, namely the 12-pin heavy-duty industrial, 15-pin D-
Sub, 9-pin D-Sub or strand wire options. Table 1 shows the pins configuration and cable color for
the respective connector types. There are also options of either left or right cable exit for the
cable.
5
9-pin D-Sub Connector (male)
PIN
Option analog (1 V
PP
)
Option digital RS 422
Cable color
1
Sine negative, U
1-
Channel A negative, Z
1-
Green
2
0V
0V
Brown/Green
3
Cosine negative, U
2-
Channel B negative, Z
2-
Pink
4
NC
Error , active low
Purple
5
Index negative, U
0-
Index negative, Z
0-
Black
6
Sine positive, U
1+
Channel A positive, Z
1+
Brown
7
Power supply, +5V
Power supply, +5V
White/Green
8
Cosine positive, U
2+
Channel B positive, Z
2+
Grey
9
Index Positive, U
0+
Index positive, Z
0+
Red
Shell
Shield
Shield
-
Strand Wire Option
Cable color
Analog (1 V
PP
)
Digital RS 422
White/Green
Power supply, +5V
Power supply, +5V
Brown/Green
0V
0V
Red
Index Positive, U
0+
Index positive, Z
0+
Black
Index negative, U
0-
Index negative, Z
0-
Brown
Sine positive, U
1+
Channel A positive, Z
1+
Green
Sine negative, U
1-
Channel A negative, Z
1-
Grey
Cosine positive, U
2+
Channel B positive, Z
2+
Pink
Cosine negative, U
2-
Channel B negative, Z
2-
Purple
NC
Error, active low
Yellow
NC
Error, active high
White
NC
NC
Blue
NC
NC
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