Optical Encoders
SERIES 61A
Custom, Absolute
FEATURES
• Absolute Position Sensing
• 3, 4, or 5-Bit Custom Output Coding
• 8 to 32 Positions
• Continuous Rotation and Fixed
Stops Available
• Angles of Throw to 45° (Design
Specifications Will Dictate the Angle
of Throw)
DIMENSIONS
In inches (and millimeters)
.320 ±.005
(BUSHING FLATS)
Optical and Mechanical
Encoders
I-17
±.005
.875 ±.005
SQUARE
.562
3 PLCS.
.688
3 PLCS.
.250
.331
.248
/.250
3/8-32 UNEF 2A
THREAD
MOUNTING
SURFACE
MOUNTING
SURFACE
.093
.780 ±.025
XXX ±.300
Unless otherwise specified, dimension tolerances are as follows: linear ±.010
(0,25), diameters ±.010 (0,25), angular ±5˚
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Optical Encoders
SPECIFICATIONS
Ratings
Operating Voltage:
5 ±.25V DC
Supply Current:
85 mA maximum at 5V DC
Life:
1 million cycles of operation; 1 cycle is
rotation through all positions and a full return
Rotational Torque:
1.5 in-oz (Initial)
Output High:
3.8V minimum for CMOS &
HCMOS; 2.7V minimum for TTL
Output Low:
0.8V maximum
Shaft Push Out Force:
25 lbs.
Mounting Torque:
10 in-lb maximum
Load Current:
5 mA maximum per channel
Logic Rise and Fall Times:
30 mSec typical
CIRCUITRY
+5 VOLTS
R*
7
BIT 0
R*
6
BIT 1
R*
5
BIT 2
R*
4
BIT 3
R*
3
Environmental
Operating Temperature Range:
-40°C to +85°C
Storage Temperature Range:
-55°C to +100°C
Vibration:
MIL-STD 202, method 204, condition B
Mechanical Shock:
100 g’s, 6 ms, half Sine
12.3 ft/s and 100 g’s, 6 ms, sawtooth, 9.7 ft/s
Humidity:
90-95% Relative humidity at
40°C for 96 hrs.
BIT 4
2
GROUND
1
* EXTERNAL PULL-UP RESISTORS REQUIRED FOR OPERATION (4.7k)
Materials and Finishes
Detent Housing/Bushing:
Nylon 6/10
Shaft:
Glass-filled nylon
Detent Balls:
Steel, nickel-plated
Code Housings:
Nylon 6/10
Backplate:
Nylon 6/10
Aperture:
Chemically etched stainless steel with
black oxide finish
Rotor:
Electroformed nickel and chemically
etched stainless steel with black nickel finish
Detent Springs:
Tinned music wire
PC Boards:
NEMA grade FR-4
Through Bolts:
Stainless steel, unplated
Through Bolt Nuts:
Stainless steel
Switch Assembly Cover:
Thermosetting plastic
Mounting Hardware:
One brass, cadmium-
plated nut and lockwasher supplied with each
switch. Nut is 0.094 inches thick by 0.562
inches across flats.
TRUTH TABLE
3 BIT, 8 POSITION
Position
1
2
3
4
5
6
7
8
B2
B3
B4
Optical and Mechanical
Encoders
5 BIT, 32 AND 24 POSITION
Position
1
2
3
4
5
6
7
8
9
10
11
12
13
B0
B1
B2
B3
B4
INDICATES LOGIC HIGH
BLANK INDICATES LOGIC LOW
4 BIT, 16 POSITION
Position
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
B1
B2
B3
B4
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
ACCESSORIES
See page I-41. For control knobs see page
I-57.
ORDERING INFORMATION
Options include stainless steel detent housing
for higher rotational torque applications. Metal
shaft and bushing available. Custom shaft and
bushing configurations available. Contact
Grayhill for information on angles of throw
and stop strength.
61A32-025
NUMBER OF POSITIONS
32 = 32 POSITIONS WITH 10˚ OF THROW
24 = 24 POSITIONS WITH 12˚ OF THROW
16 = 16 POSITIONS WITH 18˚ OF THROW
8 = 8 POSITIONS WITH 36˚ OF THROW
TERINATION
BLANK = PINS
-XXX = CABLE LENGTH
CABLE LENGTH IS DENOTED
IN .5" INCREMENTS FROM
025=2.5 INCHES TO 250=25.0
INCHES.
INDICATES LOGIC HIGH
BLANK INDICATES LOGIC LOW
INDICATES LOGIC HIGH
BLANK INDICATES LOGIC LOW
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
I-18
