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53
Model 132, 138, 139
Vishay Spectrol
Document Number: 57038
Revision 16-Jul-03
For technical questions, contact sfer@vishay.com
FEATURES
• Choice of Three Elements for Broad Resistance Range
• Center Tap Available
• Continuous Rotation & Mechanical Stops Both Standard
• High Power Rating (139)
1-5/16” (33.3mm) Low Cost Industrial Single Turn
Wirewound, Conductive Plastic, Cermet
PARAMETER MIL-PRF-12934/MIL-PRF-39023 TEST PROCEDURES APPLY
STANDARD SPECIAL
Total Resistance: Model 132 Wirewound 5Ω to 20KΩto 35KΩ
Tolerance: 50Ω and above ± 3% ± 1%
Below 50Ω± 5% ± 3%
Model 138 Conductive Plastic 1KΩ to 50KΩ–
Tolerance: ± 10% ± 5%
Model 139 Cermet 500Ω to 2MΩ–
Tolerance: ± 20% ± 5%
Linearity (Independent) STANDARD BEST PRACTICAL
Total Resistance (132)
5Ω to 20Ω± 1.0% ± 0.75%
20Ω to 200Ω± 1.0% ± 0.50%
200Ω and above ± 0.5% ± 0.25%
138/139 ± 0.5% ± 0.25%
Noise (132) 100Ω ENR
Output Smoothness (138 & 139) 0.1% maximum
Power Rating 40°C Ambient
Model 132 2.75 watts
Model 138 2 watts
Model 139 5 watts
All Models derated to zero at 125°C
Electrical Rotation MODEL 132 MODEL 138 MODEL 139
Continuous 352° ± 2°345° ± 4°345° ± 4°
Stops 336° ± 2°336° ± 4°336° ± 4°
Insulation Resistance 1000MΩ minimum at 500VDC
Dielectric Strength 1000VRMS, 60Hz
Absolute Minimum Resistance 1.0% of total resistance or 0.5Ω whichever is
greater (132 only)
Minimum Voltage 0.5% maximum
Temperature Coefficient of Resistance
132 Refer to standard resistance element data
138 ± 500ppm/°C maximum
139 ± 100ppm/°C maximum
ELECTRICAL SPECIFICATIONS
ORDERING INFORMATION
The Models 132, 138 and 139 can be ordered from this specification sheet by stating. Example: 139 - 0 - 0 - 203
139 0 0 203
MODEL MECHANICAL OPTIONS OTHER OPTIONAL RESISTANCE CODE
FEATURES
132, 138 or 139 0. Continuous 0. Standard (End Taps) 2: 1st Significant digit
2. Stops 1. Center Tap (Within 5° of Electrical Center) 0: 2nd significant digit
3: Number of Zero’s
Other characteristics will be standard as described on this specification sheet. If special characteristics are required such as special
linearity tolerance, special resistance tolerance, non-linear functions, etc., please state these on your order
ENVIRONMENTAL SPECIFICATIONS
Vibration 15Gs thru 2000 Hz
Shock 50g
Salt Spray 48 Hours
Rotational Life
Shaft Revolutions
Model 132 500,000
Model 138 2 million
Model 139 2 million
Operating Temperature Range - 55°C to + 125°C
Moisture Resistance –
MATERIAL SPECIFICATIONS
Housing Molded glass filled thermoplastic
Rear Lid Glass filled thermoset plastic
Shaft Stainless steel, non-magnetic
Terminals Brass, plated for solderability,
Non-passivated
Mount Hardware
Lockwasher Internal Tooth: Steel, nickel plated
Panel nut: Brass, nickel plated
Document Number: 57038
Revision 16-Jul-03
www.vishay.com
54
Model 132, 138, 139
Vishay Spectrol
For technical questions, contact sfer@vishay.com
DIMENSIONS in inches (millimeters)
1 - 5/16” (33.3mm) Low Cost Industrial Single Turn
Wirewound-, Conductive Plastic, Cermet
MECHANICAL SPECIFICATIONS
PARAMETER
Rotation 360° (continuous) 340° ± 5° stops
Bearing Type Sleeve
Torque (Maximums) STARTING RUNNING
1.0 oz - in (72gm - cm ) 0.7 oz - in (50, 40gm - cm)
Runouts (Maximums)
Shaft Runout (TIR) 0.002 in (0.05mm)
Pilot Dia. Runout (TIR) 0.003 in (0.08mm)
Lateral Runout (TIR) 0.005 in (0.13mm)
Shaft End Play 0.008 in (0.20mm)
Shaft Radial Play 0.003 in (0.08mm)
Weight 1.0 oz maximum (28,35gm)
Stop Strength 8.0 in - lbs (9.21 Kgm - cm) (Stops Version Only)
MAXIMUM MAXIMUM
CURRENT VOLTAGE WIRE
RESISTANCE RESO- OHMS AT 40
°
C ACROSS TEMP.
VALUES LUTION PER AMBIENT COIL COEF.
(
Ω
) (%) TURN (mA)(V) (ppm/
°
C)
5 0.419 0.021 742 3.71 800
10 0.327 0.032 524 5.24 800
20 0.280 0.056 371 7.42 800
50 0.290 0.145 234 11.7 20
100 0.251 0.251 166 16.6 20
200 0.212 0.424 122 24.4 20
500 0.161 0.806 74.2 37.1 20
1K 0.150 1.50 52.4 52.4 20
2K 0.132 2.64 37.1 74.2 20
5K 0.107 5.34 23.4 117 20
10K 0.080 7.98 16.6 166 20
20K 0.067 13.4 12.2 244 20
35K 0.057 20.0 8.88 311 20
RESISTANCE ELEMENT DATA
POWER RATING CHART
Unit Units shall be marked with Spectrol name,
Identification model number, resistance and tolerance,
linearity, terminal identification, and data code
Applicable test procedures: Model 132, MIL-
R-12934: Model 138 & 139. MIL-R-39023
MARKING
± 0.031
0.875
(22.22) Ø 0.4062 MTG. (10.32)
+ 0.0000
- 0.0020
0.032
(0.81)
Ø 0.2497 (6.34)
0.030 MAX. (0.76)
+ 0.0000
- 0.0003
0.562 (14.27)
0.032 (0.81)
3/8 - 32 UNEF - 2A
Ø 0.125 (3.18)
0.062 (1.57)
MTG. SURFACE
0.062
(1.57)
0.625
(15.88)
± 0.015
0.187
(4.75)
± 0.015
Ø 1.312
(33.32)
± 0.015
60°
± 0.015
Ø 0.500
(12.70)
BC
0 20 40 60 80 100 120 140
AMBIENT TEMPERATURE IN (°C)
RATED POWER IN (WATTS)
6.0
5.0
4.0
3.0
2.0
1.0
139
132
138
TOLERANCES: UNLESS OTHERWISE NOTED
DECIMALS ± 0.005 ANGLES ± 2°
13
2
SCHEMATIC
CW
0.375
(9.52)
± 0.015
± 0.010
Legal Disclaimer Notice
Vishay
Document Number: 91000 www.vishay.com
Revision: 08-Apr-05 1
Notice
Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc.,
or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, by
estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's
terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express
or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness
for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify Vishay for any damages resulting from such improper use or sale.
