AEDL Series Optical Linear Incremental Encoder
Data Sheet
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 er-
ror due to friction and alignment errors.
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
Avago Technologies’ Quick Stick™ method, the encoder
profile can be easily adjusted while the system is aligned
to the machine system. The Quick Stick™ method pro-
vides 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) en-
sure that the scanning head is fixed at a nominal posi-
tion while the linear encoder is aligned and mounted to
the machine system.
Typical applications:
•
XY table positioning
•
high precision machines
•
industrial plotter
•
high-accuracy measurements
•
linear motors
•
robotics
•
electronics assembly and inspection
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
With state of the art technologies, Avago Technologies’
•
0.05 µm
*
, 0.1 µm
*
, 0.5 µm, 1 µm, 5 µm and 10 µm
linear encoders provide an ideal feedback control to
resolutions
high precision motion systems. The linear encoders are
•
40 µm grating period (pitch)
available in two colors, silver or black anodized.
•
± 3 µm or ± 5 µm (per meter) accuracy class
Applications
•
0 °C to +55 °C temperature range
The AEDL Series linear encoder provides linear motion
•
Single 5V supply
detection, delivering an accurate and insensitive closed-
•
Up to 3 m cable length
loop control solution.
Note:
Avago Technologies encoders are not recom-
mended 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.
Theory of Operation
Avago 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-condition-
ing 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 environ-
mental 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.
Definitions
Resolution:
Smallest movement detectable by the en-
coder. It is normally expressed in units of distance (e.g.
0.5 µm or 100nm).
Accuracy:
A measure of how close the output is to
where it should be. It is usually expressed in units of dis-
tance over the scale length (e.g. +/- 3µm 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 quadra-
ture decoded.
Quadrature: This term refers to the 90-electrical-degree
Output incremental signal can be specified as either (1/4 of a cycle) phase relationship between the A and B
digital (RS422) or 1 Vpp analog sinusoidal when order- channels of incremental encoder output.
ing. Signals of Channel A and Channel B are 90°e phase-
Quadrature Decode: Also known as 4X Decode, it refers
shifted. Index marks are periodically spaced at a distance
to the common practice of counting all 4 quadrature
of 50 mm, or distance coded at 500 x pitch size*. Fault
states (or square wave transitions) per cycle of quadra-
detection signal is activated when improper opera-
ture square waves. Thus, a linear encoder with a cycle
tion occurs, such as power cutoff, loss of light source or
width of 40µm, for example, has a resolution of 10 µm.
heavy contamination. This signal can be used to shut
down machine operation safely, when a failure occurs.
Pitch: Also known as grating or optical period, it refers
to the distance for a single window-bar pair on the lin-
ear 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 out-
puts 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 µm and 0.1 µm are future options, which are not yet avail-
able. The resolutions stated are after interpolation and users’ quadrature
decoding. Distance-coded version will be available as a future option.
Outline Drawing
Description
A
B
C
D
E
F
G
H
Start of measuring length
Distance between the mounting screw holes
Cable diameter
Overall length of measuring system (ML + 34 mm)
Mounting surface with high strength adhesive tape type TESA 4965
Output signal (RS422A digital or analog 1 Vpp)
Initial position of scanning head when ready for installation (available on the opposite side upon
request)
Mounting surface to machine parts
Tape Mounting Version
F
G
H
A
B
C
D
E
3
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.
12-pin Round Connector
PIN
1
2
3
4
5
6
7
8
9
10
11
12
Shell
Analog (1 V
PP
)
Cosine negative, U
2-
Power supply, +5V
Index Positive, U
0+
Index negative, U
0-
Sine positive, U
1+
Sine negative, U
1-
NC
Cosine positive, U
2+
NC
0V
0V
+5V
Shield
Digital RS 422
Channel B negative, Z
2-
Power supply, +5V
Index positive, Z
0+
Index negative, Z
0-
Channel A positive, Z
1+
Channel A negative, Z
1-
Error, active low
Channel B positive, Z
2+
Error, active high
0V
0V
+5V
Shield
Cable color
Pink
White/Green
Red
Black
Brown
Green
Purple
Grey
Yellow
Brown/Green
-
-
-
15-pin D-Sub Connector (male)
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Shell
Analog (1 V
PP
)
NC
NC
NC
Index negative, U
0-
Cosine negative, U
2-
Sine negative, U
1-
NC
Power supply, +5V
0V
NC
NC
Index Positive, U
0+
Cosine positive, U
2+
Sine positive, U
1+
NC
Shield
Digital RS 422
NC
NC
Error , active low
Index negative, Z
0-
Channel B negative, Z
2-
Channel A negative, Z
1-
NC
Power supply, +5V
0V
Switch
Error, active high
Index positive, Z
0+
Channel B positive, Z
2+
Channel A positive, Z
1+
NC
Shield
Cable color
-
-
Purple
Black
Pink
Green
-
White/Green
Brown/Green
White
Yellow
Red
Grey
Brown
Blue
-
9-pin D-Sub Connector (male)
PIN
1
2
3
4
5
6
7
8
9
Shell
Option analog (1 V
PP
)
Sine negative, U
1-
0V
Cosine negative, U
2-
NC
Index negative, U
0-
Sine positive, U
1+
Power supply, +5V
Cosine positive, U
2+
Index Positive, U
0+
Shield
Option digital RS 422
Channel A negative, Z
1-
0V
Channel B negative, Z
2-
Error , active low
Index negative, Z
0-
Channel A positive, Z
1+
Power supply, +5V
Channel B positive, Z
2+
Index positive, Z
0+
Shield
Cable color
Green
Brown/Green
Pink
Purple
Black
Brown
White/Green
Grey
Red
-
Strand Wire Option
Cable color
White/Green
Brown/Green
Red
Black
Brown
Green
Grey
Pink
Purple
Yellow
White
Blue
Analog (1 V
PP
)
Power supply, +5V
0V
Index Positive, U
0+
Index negative, U
0-
Sine positive, U
1+
Sine negative, U
1-
Cosine positive, U
2+
Cosine negative, U
2-
NC
NC
NC
NC
Digital RS 422
Power supply, +5V
0V
Index positive, Z
0+
Index negative, Z
0-
Channel A positive, Z
1+
Channel A negative, Z
1-
Channel B positive, Z
2+
Channel B negative, Z
2-
Error, active low
Error, active high
NC
NC
5
Embedded System
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