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Optical
and
Mechanical
Encoders
Grayhill, Inc. 561 Hillgrove Avenue LaGrange, Illinois
60525-5997 USA Phone: 708-354-1040 Fax: 708-354-2820 www.grayhill.com
Optical Encoders
CIRCUITRY, TRUTH TABLE, AND WAVEFORM: Standard Quadrature 2-Bit Code
Clockwise Rotation
Position Output A Output B
1
2
3
4
Indicates logic high; blank indicates logic
low. Code repeats every 4 positions.
OUTPUT
A
OUTPUT
B
HIGH
LOW
HIGH
LOW
POSITION NUMBER
1
2
3
4
5
6
SPECIFICATIONS
Pushbutton Switch Ratings
Rating: 5 Vdc, 10 mA, resistive
Contact Resistance: less than 10 ohms (TTL
or CMOS Compatible)
Voltage Breakdown: 250 Vac between mutually
insulated parts.
Contact Bounce: Less than 4 milliseconds at
make and less than 10 milliseconds at break.
Actuation Life: 3,000,000 operations.
Actuation Force: maximum actuation force of
330 grams and a minimum actuation force of
250 grams.
Encoder Ratings
Coding: 2-bit quadrature coded output.
Operating Voltage: 5.0 ±.25 Vdc
Supply Current: 30 mA maximum at 5 Vdc
Logic High: 3.8V for CMOS and 2.7V for TTL
minimum.
Logic Low: 0.8V maximum
Logic Rise and Fall Times: Rise Time less
than 30 mS at 16.6 RPM. Fall Time less than 30
mS at 16.6 RPM.
Operating Torque: 1.5 in-oz ± 50% initial (1.0
in-oz 50% after life for 32 position only)
Rotational Life: more than 1,000,000 cycles of
operation (1 cycle = 360° rotation and return)
Shaft Push Out Force: 20 lbs minimum
Mounting Torque: 10 in-lbs maximum
Environmental Ratings
Operating Temperature Range: –40°C to 85°C
Storage Temperature Range: –55°C to 100°C
Relative Humidity: 90-95% at 40°C for 96
hours.
Vibration Resistance: Harmonic motion with
amplitude of 15g, within a varied 10 to 2000 Hz
frequency for 12 hours per MIL-STD-202,
Method 204
Shock Resistance: Test 1: Tested at 100g for
6 mS, half sine, 12.3 ft/s Test 2: 100g for 6 mS,
sawtooth, 9.7 ft/s
Materials and Finishes
Bushing: Reinforced thermoplastic
Shaft: Reinforced thermoplastic
Detent Balls: Steel, nickel-plated
Detent and Pushbutton Springs: Tinned music
wire
Printed Circuit Boards: NEMA grade FR-4
Pushbutton Contact: Stainless steel, gold-
plated
Board Terminals: Phosphor bronze, tin-plated
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.
Rotor: Reinforced thermoplastic
Aperture/Dome Retainer: Lexan 141,
Polycarbonate
ACCESSORIES
See page I-41.
1
2
3
4
5
6
POWER +5V
OUTPUT A
OUTPUT B
N.O.
PUSHBUTTON
SWITCH
GROUND
PIN #
R*
150
5%
* External pull-up resistors required for operation.
8.2 k
is suggested for TTL; 3.3 k is suggested for CMOS.
Available from your local Grayhill Distributor. For prices and discounts, contact a local Sales Office, an authorized local Distributor or Grayhill.
Custom knobs available, see page I-57.
ORDERING INFORMATION
Series
Style: C = Standard
Angle of Throw:
00 = No detent
11 = 11.25° or 32 Positions
22 = 22.25° or 16 Positions
Coding: 01 = Quadrature
61C22-01-04-02
Pushbutton Option: 01 = Without pushbutton, 02 = With pushbutton
Number of Changes per Revolution: 04 for no detent and 22.25° angle of throw
08 for no detent and 11.25° angle of throw
I-22