1
1-83 Model 91
MODEL 91
3/8” Diameter
Single Turn
Cermet Trimming
Potentiometer
ELECTRICAL
Standard Resistance Range, Ohms 10 to 2Meg
Standard Resistance Tolerance ±20%
Input Voltage, Maximum 250 Vdc or rms not to exceed power rating
Slider Current, Maximum 100mA or within rated power, whichever is less
Power Rating, Watts 0.5 at 70°C derating to 0 at 125°C
End Resistance, Maximum 2 Ohms
Actual Electrical Travel, Nominal 174°
Dielectric Strength 500 Vrms
Insulation Resistance, Minimum 1,000 Megohms
Resolution Essentially infinite
Contact Resistance Variation, Maximum 1% or 1 Ohm, whichever is greater
ENVIRONMENTAL
Temperature Coefficient, Maximum ±100ppm/°C
Operating Temperature Range –55°C to +125°C
Thermal Shock 5 cycles, –55°C to +125°C (1% ∆RT, 1% ∆VR)
Moisture Resistance Ten 24 hour cycles (1% ∆RT, IR 100 Megohms Min.)
Shock, 6ms Sawtooth 100G’s (1% ∆RT, 1% ∆VR)
Vibration 20G’s, 10 to 2,000 Hz (1% ∆RT, 1% ∆VR)
High Temperature Exposure 250 hours at 125°C (2% ∆RT, 2% ∆VR)
Rotational Life 200 cycles (3% ∆RT)
Load Life at 0.5 Watts 1,000 hours at 70°C (2% ∆RT)
Resistance to Solder Heat 260°C for 10 sec. (1% ∆RT)
MECHANICAL
Mechanical Stops Solid
Stop Strength 12 oz.-in. (0.085 N-m)
Torque, Starting Maximum 5oz.-in. (0.042 N-m)
Weight, Nominal .03 oz. (0.85 grams)
Specifications subject to change without notice.
.10
2.54
.20
5.08
.25
6.35
Max.
.18
4.57
.20
5.08.40
10.2
.015 ± .005
0.381 ± 0.127
True Radius (Typ.)
(2)
(3) (1)
Min.
Model 91E
Model 91
1-84
.375
9.525
Max. Dia.
Arrow Indicates Slider Position. Electrical Adjustments
May Be Made With A Phillips Or Blade Screwdriver And Is Fingertip Adjustable.
For Phillips
Screwdriver
Dia.
Resistance Value
Marked On This Surface
Model Number
Marked On This Surface
For Blade
Screwdriver
Slot: .034
0.864
.15
3.81
.20
5.08
.20
5.08
.18
4.57
.20
5.08
Wide X
Min.
Deep
.050
1.270
.10
2.54
(1) (3)
(2)
.10
2.54
.20
5.08
.385
9.779
Max.
.020 ± .005
0.508 ± 0.127
Solderable
Terminals
Standoffs (2)
Model 91A
TOP ADJUSTMENT (Inch/mm)
(3)
(2)
(1)
.10
2.54
.20
5.08
.25
6.35
Max. .18
4.57
Min.
.10
2.54
Model 91B
(3)
(2)
(1)
.172
4.369
.25
6.35
Max. .18
4.57
Min.
.10
2.54
.156
3.962
.344
8.738
Model 91C
1
1-85 Model 91
.10
2.54
(3)
(2)
(1)
.20
5.08
.18
4.57
.345
8.763
Max.
.10
2.54
Min.
Model 91X
.10
2.54
(3)
(2)
(1)
.20
5.08
.18
4.57
.345
8.763
Max.
.10
2.54
Min.
Model 91T
SIDE ADJUSTMENT (Inch/mm)
.172
4.369
(3)
(2)
(1)
.344
8.738
.18
4.57
.40
10.2
Max.
.156
3.962
Min.
Model 91V
.10
2.54
(3)
(2)
(1)
.20
5.08
.18
4.57
.25
6.35
Max.
Min.
Model 91W
91 A R 10K LF
Model Series
Pin Style
RoHS Compliant Product Code - Optional
Resistance Value
Resistance Prefix
1-86 Model 91
CIRCUIT DIAGRAM
(1)
(2)
(3)
CW
NOTES
mm
INCH
Metric equivalents, based on 1 inch = 25.4mm are
rounded to the same number of significant figures
as in the original English units and are provided for
general information only.
Tolerances unless otherwise specified:
Linear = ± .01 inches (.25mm)
Angular = ± 2 degrees
Standard:
PACKAGING
ORDERING INFORMATION
Standard:Boxes
Capacity = 100 Units
STANDARD RESISTANCE VALUES, OHMS
10 200 5K 50K 500K
20 500 10K 100K 1Meg
50 1K 20K 200K 2Meg
100 2K 25K 250K
