7/8" (22.2 mm) Precision Industrial Potentiometer
Bushing and Servo Mount Versions, Conductive Plastic
Model 157
Vishay Spectrol
www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 57042
16 Revision: 18-Jun-07
FEATURES
•High quality
•Rugged one piece metal housing
•Long rotational life
•Wide operating temperature range
•Linearities down to ± 0.25 % special
•Optional sealed construction (bushing mount only)
RoHS
COMPLIANT
ELECTRICAL SPECIFICATIONS
PARAMETER MIL-PRF-39023 TEST PROCEDURES APPLY
Resistance 1 kΩ to 100 kΩ
Resistance Tolerance
Special to
± 20 %
± 10 %
Linearity
Special to
± 2.0 %
± 0.25 %
Temperature Coefficient of Resistance ± 600 ppm/°C
Power Rating
Derated to
1.0 W at 40 °C ambient
0 W at 125 °C
Electrical Angle 340° ± 4°
End Voltage 0.5 % maximum
Dielectric Withstanding 1000 VRMS, 60 Hz
Insulation Resistance 100 MΩ minimum, 500 VDC
Output Smoothness 0.1 %
MECHANICAL SPECIFICATIONS
PARAMETER
Weight 0.5 oz. maximum (14 g)
Rotation 360° (continuous)
Mount
Bearing Type
BUSHING
Sleeve bearing
SERVO
Ball bearing
Operating Torque
Starting
Running
0.30 oz. - in (21.6 g - cm)
0.25 oz. - in (18 g - cm)
0.25 oz. - in (18 g - cm)
0.15 oz. - in (10.8 g - cm)
Mechanical Tolerance (in/mm) (maximum)
Shaft Runout (TIR) 0.002" (0.05 mm) 0.002" (0.05 mm)
Pilot Dia Runout (TIR) - 0.002" (0.05 mm)
Lateral Runout (TIR) 0.005" (0.13 mm) 0.002" (0.05 mm)
Shaft End Play 0.006" (0.15 mm) 0.005" (0.13 mm)
Shaft Radial Play 0.003" (0.08 mm) 0.002" (0.05 mm)
ORDERING INFORMATION/DESCRIPTION
157 B 50K 20 % C BO10
MODEL MOUNTING OHMIC VALUE TOLERANCE LINEARITY PACKAGING
ON OHMIC VALUE
B = Bushing C: ± 0.25 % Box of 10 pieces
S = Servo
Model 157
7/8" (22.2 mm) Precision Industrial Potentiometer
Bushing and Servo Mount Versions, Conductive Plastic
Vishay Spectrol
Document Number: 57042 For technical questions, contact: sfer@vishay.com www.vishay.com
Revision: 18-Jun-07 17
SAP PART NUMBERING GUIDELINES
157 S 502 M X B10
MODEL STYLE OHMIC VALUE TOLERANCE LINEARITY PACKAGING
ON OHMIC VALUE
502 = 5K M: ± 20 % X: ± 2 % Box of 10 pieces
DIMENSIONS in inches (millimeters)
MATERIAL SPECIFICATIONS
Housing/Bushing Aluminum, anodized
Rear Lid Ceramic
Shaft Stainless steel
Terminals Solderable
Bushing Mount Hardware Lockwasher, internal tooth steel, nickel plated
Panel Nut Brass, nickel plated
BUSHING MOUNT: 157B...
0.455
(11.56)
± 0.015
0.062 (1.57)
0.062 (1.57)
Ø 0.1248
Ø 0.1245
(3.17)
0.062 (1.57)
0.500
(12.7)
Ø 0.750
(19.05)
Ø 0.070
(1.78)
Ø 0.050
(1.27)
RETAINER
Ø 0.20 MAX. x 0.02 MAX. (5.08)
Ø 0.7500 (19.05)
Ø 0.7495
123
157 - XXXX
XXXΩ± XX%
± XX%XXXX
XXX Country
SERVO MOUNT: 157S...
0.875
(22.22)
± 0.031
Ø 0.2497
(6.34)
RETAINER: Ø 0.312 x 0.03 MAX.
3/8 - 32 UNEF - 2A
0.345
(8.76)
± 0.015
0.125
(3.18)
± 0.010
Ø 0.9.52 x 1.57 WIDE
IMPERFECT
THREAD AREA
0.365
(9.27)
± 0.010
0.312
(7.92)
LOCATING PIN Ø
0.062 x 0.062
(1.57 x 1.57)
TERM 1
TERM 2
TERM 3
90°
Ø 0.875
(22.2)
0.176 TERMINAL
RADIUS (4.47)
MARKING
+ 0.0000
- 0.0003
TOLERANCES: UNLESS OTHERWISE NOTED.
DECIMALS ± 0.005 ANGLES ± 2°
CW
SCHEMATIC
2
3
1
± 0.031
ENVIRONMENTAL SPECIFICATIONS
Temperature - 55 °C + 125 °C
Rotational Life BUSHING
5 million shaft revolutions
SERVO
10 million shaft revolutions
Moisture Resistant Yes
Vibration 15 g 10 to 2000 Hz
Shock 50 g
Salt Spray 96 h
Load Life 900 h
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
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