OPTICAL ENCODERS
All Litton Poly-Scientific, Clifton Precision™ motors can be fitted with an encoder.
Litton Poly-Scientific uses the Hewlett-Packard
HEDS
and
HEDM
series of optical
encoders as their standard offering.
Other encoders are available; if you have a
specific need please contact one of our applications engineers.
Features:
Ø
Two Channel Quadrature Output with Optional Index Pulse
Ø
No Signal Adjustment Required
Ø
Low Cost
Ø
Small Size
Ø
Resolutions Up to 1024 Counts Per Revolution
Ø
-40° to 100° Operating Temperature
C
C
Ø
TTL Compatible
Ø
Single 5 Volt Supply
Specifications @ 25° (77°
C
F):
HEDS 5500
Counts Per Revolution
Number of Channels
Supply Voltage (V
cc
) (vdc)
Supply Current (I
cc
) (mA – typical)
Load Capacitance (C
L
) (pF max.)
Count Frequency (f) (kHz max.)
Pulse Width (P) (°
e)
Phase Shift (φ (°
) e)
Pulse Width Error (∆P) (° max.)
e
Index Pulse Width (P
o
) (° max.)
e
Signal Rise Time (t
r
) (ns typ.)
Signal Fall Time (t
f
) (ns typ.)
Operating Temperature (°
C)
Velocity (rpm) (max.)
Acceleration (rad/sec
2
) (max.)
Definitions:
Count (N) –
the number of bar and window pairs or counts per revolution (CPR) of the codewheel
Pulse Width (P) –
the number of electrical degrees that an output is high during 1 cycle. This value is nominally 180
°
or ½ cycle
e
Pulse Width Error (∆P) –
the deviation, in electrical degrees, of the pulse width from its ideal value of 180
°
e
Phase (φ –
the number of electrical degrees between the center of the high state of channel A and the center of
)
channel B. This value is nominally 90
°
for quadrature output.
e
Phase Error (∆φ –
the deviation of the phase from its ideal value of 90°
)
e.
Index Pulse Width (P
o
) –
the number of electrical degrees that an index output is high during one full shaft rotation.
This value is nominally 90
°
or ¼ cycle.
e
96 to 512
Two
4.5 to 5.5
17
100
100
180 +/- 45
90 +/- 20
45
N/A
200
50
-40 to 100
30000
250000
HEDS 5540
96 to 512
Two + Index
4.5 to 5.5
17
100
100
180 +/- 45
90 +/- 20
35
125
180
40
-40 to 100
30000
250000
HEDM 5500
1000 to 1024
Two
4.5 to 5.5
17
100
100
180 +/- 45
90 +/- 20
45
N/A
180
40
-40 to 100
30000
250000
Ordering Information:
In order for us to provide the correct encoder for your application, it is necessary that you provide
us with:
A. # of channels
B. CPR (counts per revolution)
C. Whether or not Differential Lines Drivers are required
To facilitate the correct selection, simply fill in the blocks below.
HEDS 55
0
# OF CHANNELS
0 = 2 Channel
4 = 3 Channel
Resolution (CPR)
K = 96 C = 100
D = 192 E = 200
F = 256 G = 360
H = 400 A = 500
I = 512
HEDM 55
0
# OF CHANNELS
0 = 2 Channel
Resolution (CPR)
B = 1000
J = 1024
NOTE:
If Differential Line Drivers are needed, simply substitute an
L
into the part # (ex.
HEDL)
Example:
You need a 2-channel encoder with a line count (CPR) of 512. The correct part # would be:
HEDS-5500-I
If you needed the 2-channel, 512 CPR, but with differential line drivers, the correct part # would be:
HEDL-5500-I
HEDL Line Driver Dimensions and Pinout
