Model 132, 138, 139
Vishay Spectrol
1-5/16” (33.3mm) Low Cost Industrial Single Turn
Wirewound, Conductive Plastic, Cermet
FEATURES
•
•
•
•
Choice of Three Elements for Broad Resistance Range
Center Tap Available
Continuous Rotation & Mechanical Stops Both Standard
High Power Rating (139)
ELECTRICAL SPECIFICATIONS
PARAMETER
Total Resistance: Model 132 Wirewound
Tolerance: 50Ω and above
Below 50Ω
Model 138 Conductive Plastic
Tolerance:
Model 139 Cermet
Tolerance:
Linearity (Independent)
Total Resistance (132)
5Ω to 20Ω
20Ω to 200Ω
200Ω and above
138/139
Noise (132)
Output Smoothness (138 & 139)
Power Rating
Model 132
Model 138
Model 139
Electrical Rotation
Continuous
Stops
Insulation Resistance
Dielectric Strength
Absolute Minimum Resistance
Minimum Voltage
Temperature Coefficient of Resistance
132
138
139
MIL-PRF-12934/MIL-PRF-39023 TEST PROCEDURES APPLY
STANDARD
SPECIAL
5Ω to 20KΩ
to 35KΩ
±
3%
±
1%
±
5%
±
3%
1KΩ to 50KΩ
–
±
10%
±
5%
500Ω to 2MΩ
–
±
20%
±
5%
STANDARD
BEST PRACTICAL
±
±
±
±
1.0%
1.0%
0.5%
0.5%
±
0.75%
±
0.50%
±
0.25%
±
0.25%
100Ω ENR
0.1% maximum
40°C Ambient
2.75 watts
2 watts
5 watts
All Models derated to zero at 125°C
MODEL 132
MODEL 138
MODEL 139
352°
±
2°
345°
±
4°
345°
±
4°
336°
±
2°
336°
±
4°
336°
±
4°
1000MΩ minimum at 500VDC
1000V
RMS
, 60Hz
1.0% of total resistance or 0.5Ω whichever is
greater (132 only)
0.5% maximum
Refer to standard resistance element data
±
500ppm/°C maximum
±
100ppm/°C maximum
MATERIAL SPECIFICATIONS
Housing
Rear Lid
Shaft
Terminals
Mount Hardware
Lockwasher Internal Tooth:
Panel nut:
Molded glass filled thermoplastic
Glass filled thermoset plastic
Stainless steel, non-magnetic
Brass, plated for solderability,
Non-passivated
Steel, nickel plated
Brass, nickel plated
ENVIRONMENTAL SPECIFICATIONS
Vibration
Shock
Salt Spray
Rotational Life
Shaft Revolutions
Model 132
Model 138
Model 139
Operating Temperature Range
Moisture Resistance
15Gs thru 2000 Hz
50g
48 Hours
500,000
2 million
2 million
- 55°C to + 125°C
–
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
Document Number: 57038
Revision 16-Jul-03
For technical questions, contact sfer@vishay.com
www.vishay.com
53
Model 132, 138, 139
Vishay Spectrol
1 - 5/16” (33.3mm) Low Cost Industrial Single Turn
Wirewound-, Conductive Plastic, Cermet
±
0.031
0.875
+ 0.0000
- 0.0020
Ø 0.4062 MTG. (10.32)
DIMENSIONS
in inches (millimeters)
±
0.015
60
°
0.625
(15.88)
(22.22)
±
0.015
0.187
(4.75)
±
0.015
Ø 0.500
(12.70)
BC
±
0.015
0.375
(9.52)
±
0.010
0.032
(0.81)
+ 0.0000
Ø 0.2497 (6.34) - 0.0003
0.062
(1.57)
0.030 MAX. (0.76)
±
0.015
Ø 1.312
(33.32)
0.562 (14.27)
0.032 (0.81)
3/8 - 32 UNEF - 2A
Ø 0.125 (3.18)
2
0.062 (1.57)
CW
1
3
TOLERANCES: UNLESS OTHERWISE NOTED
DECIMALS
±
0.005 ANGLES
±
2
°
MTG. SURFACE
SCHEMATIC
MECHANICAL SPECIFICATIONS
PARAMETER
Rotation
Bearing Type
Torque (Maximums)
Runouts (Maximums)
Shaft Runout (TIR)
Pilot Dia. Runout (TIR)
Lateral Runout (TIR)
Shaft End Play
Shaft Radial Play
Weight
Stop Strength
360° (continuous) 340°
±
5° stops
Sleeve
STARTING
RUNNING
1.0 oz - in (72gm - cm )
0.7 oz - in (50, 40gm - cm)
0.002 in (0.05mm)
0.003 in (0.08mm)
0.005 in (0.13mm)
0.008 in (0.20mm)
0.003 in (0.08mm)
1.0 oz maximum (28,35gm)
8.0 in - lbs (9.21 Kgm - cm) (Stops Version Only)
POWER RATING CHART
RATED POWER IN (WATTS)
6.0
5.0
4.0
3.0
2.0
1.0
0
20
40
60
80
100
120
AMBIENT TEMPERATURE IN (
°
C)
140
132
138
139
RESISTANCE ELEMENT DATA
MAXIMUM
CURRENT
AT 40
°
C
AMBIENT
(mA)
742
524
371
234
166
122
74.2
52.4
37.1
23.4
16.6
12.2
8.88
MAXIMUM
VOLTAGE
ACROSS
COIL
(V)
3.71
5.24
7.42
11.7
16.6
24.4
37.1
52.4
74.2
117
166
244
311
WIRE
TEMP.
COEF.
(ppm/
°
C)
800
800
800
20
20
20
20
20
20
20
20
20
20
RESISTANCE RESO-
VALUES
LUTION
(
Ω
)
(%)
5
10
20
50
100
200
500
1K
2K
5K
10K
20K
35K
0.419
0.327
0.280
0.290
0.251
0.212
0.161
0.150
0.132
0.107
0.080
0.067
0.057
OHMS
PER
TURN
0.021
0.032
0.056
0.145
0.251
0.424
0.806
1.50
2.64
5.34
7.98
13.4
20.0
MARKING
Unit
Identification
Units shall be marked with Spectrol name,
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
www.vishay.com
54
For technical questions, contact sfer@vishay.com
Document Number: 57038
Revision 16-Jul-03
Legal Disclaimer Notice
Vishay
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.
Document Number: 91000
Revision: 08-Apr-05
www.vishay.com
1
