MODEL A
1-13/16” Diameter
10-Turn
Wirewound
Precision Potentiometer
ELECTRICAL
2
Resistance Range, Ohms
Standard Resistance Tolerance
Minimum Practical Resistance Tolerance
Independent Linearity
Minimum Practical Independent Linearity
Power Rating, Watts
Input Voltage, Maximum
Dielectric Strength
Insulation Resistance, Minimum
Noise, Maximum
Actual Electrical Travel
Tap Tolerance
End Voltage, Maximum
(% of input voltage)
This model available in a hybrid version – contact factory for details.
ENVIRONMENTAL (MIL-R-12934)
10 to 500K
< 100 Ohms = ±5%,
≥
100 Ohms = ±3%
±1%
< 300 Ohms = ±0.50%,
≥
300 Ohms = ±0.25%
±0.15%,
≤
20 Ohms
±0.10%, < 100 Ohms
±0.075%, < 300 Ohms
±0.05%,
≥
300 Ohms
5.0 at 40°C derating to 0 at 85°C
1,000Vdc not to exceed power rating
1,000V rms
1,000 Megohms
500 Ohms: RT
≤
2613.7 Ohms
250 Ohms: RT > 2613.7 Ohms
3600° + 4° – 0°
≤
20 Ohms = ±3°, < 100 Ohms = ±2°
< 300 Ohms = ±1.5°,
≥
300 Ohms = ±1°
10 Ohms = 3%, 25 Ohms = 1.2%
50 Ohms = 0.6%,
≥100
Ohms = 0.25%
Operating Temperature Range
Temperature Cycling
Shock, 6ms Sawtooth
Vibration
Moisture Resistance
High Temperature Exposure
Rotational Load Life
Specifications subject to change without notice.
Static: –65°C to +85°C
Dynamic: –40°C to +85°C
5 cycles, –65°C to +85°C (5%
∆R)
100G’s (0.1ms discontinuity max.)
6 hours, 10 to 55 Hz (5%
∆RT,
0.1ms discontinuity max.)
Ten 24 hour cycles (3%
∆R)
1,000 hours at 85°C (5%
∆R)
2 mil. shaft rev. + 900 hrs. at rated wattage at 40°C (5%
∆R)
2-5
Model A
MECHANICAL
Total Mechanical Travel
Number of Gangs, Maximum
Weight, Nominal (Single Gang)
Static Stop Strength
Backlash, Maximum
Panel Nut Tightening Torque, Maximum
Shaft End Play, Maximum
Shaft Runout, T.I.R., Maximum
Pilot Diameter Runout, T.I.R., Maximum
Lateral Runout, T.I.R., Maximum
Shaft Radial Play, Maximum
Start/Run Torque, Maximum (per gang)
STANDARD RESISTANCE VALUES, OHMS
3600° + 4° – 0°
3
4.4 oz.
550 oz.-in.
1°
25 lb.-in.
.005”
.0005”
.002”
.003”
.003”
3.0 oz.-in.
Total
Resistance
10
25
50
100
200
500
1K
2K
5K
10K
20K
50K
100K
200K
300K
500K
Theoretical
Resolution
(% Nominal)
0.082
0.040
0.031
0.040
0.031
0.024
0.021
0.016
0.014
0.011
0.009
0.007
0.006
0.005
0.005
0.005
* Lower tempco available as a special model.
Tempco
of Wire
+800 ppm/°C
+800 ppm/°C
+800 ppm/°C
±20 ppm/°C
±20 ppm/°C
±20 ppm/°C
±20 ppm/°C
±20 ppm/°C
+130 ppm/°C
+130 ppm/°C
+130 ppm/°C
+130 ppm/°C
±20 ppm/°C
±20 ppm/°C
±20 ppm/°C
±20 ppm/°C
*
*
*
*
*
*
*
2-6
Model A
OUTLINE DIMENSIONS (Inch/mm)
Dim. “L”
2.016
Max.
51.21
4.243
Max.
107.78
6.143
Max.
156.04
Dim. “M”
2.062±.031
52.38±0.79
Dim. “RS”
2.875±.031
73.03±0.79
No.of Gangs
1
5.016±.031
4.205±.031
106.81±0.79 127.41±.0.79
6.100±.031
154.94±0.79
6.906+.031
175.42±0.79
2
3
2
RS
M
L
Slider
CCW
CW
Mounting Surface
.062±.016
1.58±0.41
.812±.031
20.6±0.79
1.812±.016
46.03±0.41
Dia.
+.000
.406 -.002
Dia.
+0.000
10.312 -0.051
+.0000
.2497 -.0003
Dia.
+0.0000
6.3424 -0.0076
1.250
R Max.
31.75
.562±.016
14.3±0.41
Chamfer .016 Max. x 45°
0.41
3/8 - 32 UNEF Thread
2 & 3 Gang Outline
Locating Lug
.125±.005/3.175±0.127 Dia.
Positioned as Shown
±5°
.312±.025
7.93±0.64
.062±.016
1.58±0.41
.312±.016
7.93±0.41
METRIC CONVERSIONS
1 in.
1 oz.
25.4mm
28.4 gm
1 oz.-in.
1 lb.-in.
0,007 N-m
0,113 N-m
2-7
Model A
SPECIAL FEATURE CODES
Center Tap
Linearity Tape
Rear Shaft Extension
Flatted Shaft
Slotted Shaft
Shaft Lock
Color Coded
Additional Gangs
ORDERING INFORMATION
CT
LT
RS
FS
SS
SL
CC
2G or 3G
A R 10K T2 L .25 XX
Model Series
Resistance Prefix
Resistance Value
Linearity
Optional
Non-Standard Tolerance
Optional Special
Feature Code
MATCHING TURNS COUNTING DIALS
2606, 2607, 2626, 2627, 2646, 2647, 2126, 2606S, 2607S, 2646S, 2647S, RB
CIRCUIT DIAGRAM
NOTES
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
(S)
(CCW)
(CW)
INCH
mm
2-8
Model A
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