MODEL 7280 SERIES
7/8” Diameter
10-Turn
Wirewound
Precision Potentiometer
MODEL STYLES
2
7281
7283
7284
7286
7288 (for heavy side load applications)
NEW PRODUCT
ELECTRICAL
1/8” Shaft, 1/4” Bushing
1/8” Shaft, Servo
6mm Shaft, 3/8” Bushing
1/4” Shaft, 3/8” Bushing
1/4” Shaft, 3/8” Bushing
Resistance Range, Ohms
Standard Resistance Tolerance
Minimum Practical Resistance Tolerance
Independent Linearity
Minimum Practical Independent Linearity
Power Rating, Watts
Dielectric Strength
Insulation Resistance, Minimum
Noise, Maximum
Actual Electrical Travel
Tap Tolerance
End Voltage, Maximum
100 to 100K
±5%
±1%
±0.25%
±0.15%, < 300 Ohms
±0.075%,
≥
300 Ohms
2.0 at 70°C derating to 0 at 125°C
1,000V rms
1,000 Megohms
100 Ohms
3600° + 10° – 0°, > 100 Ohms
3600° + 10° – 5°,
≤
100 Ohms
±3°
0.25% of input voltage
Specifications subject to change without notice.
2-97
Model 7280 Series
ENVIRONMENTAL (MIL-R-12934)
Operating Temperature Range
Temperature Cycling
Shock, 6ms Sawtooth
Vibration
Moisture Resistance
High Temperature Exposure
Rotational Load Life
Rotational Life Model 7288 (1 pound Side Load)
MECHANICAL
Static: –55°C to +125°C
Dynamic: –40°C to +125°C
5 cycles, –55°C to +125°C (5%
∆R)
100G’s (0.1ms discontinuity max.)
15G’s, 10 to 2,000 Hz (5%
∆R,
0.1ms discontinuity max.)
Five 24 hour cycles (3%
∆R)
1,000 hours at 125°C (5%
∆R)
1 mil. shaft rev. + 900 hrs. at rated wattage at 70°C (5%
∆R)
1 mil. shaft rev. + 900 hrs. at rated wattage at 70°C (5%
∆R)
Total Mechanical Travel
Number of Gangs, Maximum
Weight, Nominal (single gang)
Backlash, Maximum
Static Stop Strength
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
7281, 7284, 7286
60 oz.-in.
25 lb.-in.
.010”
.003”
.004”
.005”
.003”
0.8 oz.-in.
3600° + 15° – 0°
2
0.75 oz.
1°
7283
36 oz.-in.
N/A
.005”
.002”
.002”
.004”
.002”
0.6 oz.-in.
Total
Resistance
100
200
500
1K
2K
5K
10K
20K
50K
100K
Theoretical
Resolution
(% Nominal)
0.059
0.037
0.030
0.024
0.020
0.018
0.017
0.016
0.010
0.008
Tempco
of Wire
±20 ppm/°C
±20 ppm/°C
±20 ppm/°C
±20 ppm/°C
±20 ppm/°C
±20 ppm/°C
±20 ppm/°C
±20 ppm/°C
±20 ppm/°C
±20 ppm/°C
2-98
Model 7280 Series
OUTLINE DIMENSIONS (Inch/mm)
Dim.
A
7281
.688
±
.031
17.475
±
0.787
+0.0000
.1248 -0.0003
B
Mounting Surface
.281
Dim. A
C
D
7.137
3.1699
+0.0000
-0.0076
+0.000
-0.002
+0.000
-0.051
7284
.812
±
.031
20.625
±
0.787
+0.0000
.2362 -0.0005
6.0000
.406
Dia.
10.312
+0.0000
-0.0127
+0.000
-0.002
+0.000
-0.051
7286
.812
±
.031
20.625
±
0.787
+0.0000
.2500 -0.0005
6.3500
.406
Dia.
10.312
+0.0000
-0.0127
+0.000
-0.002
+0.000
-0.051
Models 7281, 7284 and 7286
Bushing Mount with Sleeve Bearing
Dia.
Dia.
Dia.
2
Dia.
1.125±.031
28.58±0.79
.750±.016
19.1±0.41
Slider
CCW
CW
.125
Min.
3.18
1/4 - 32 UNEF Thread
3/8 - 32 UNEF Thread
75°
Max.
3/8 - 32 UNEF Thread
.625
R Max.
15.9
Dim. B
Dim. C
.080±.001
Dia. .062 +.000
2.03±0.03
-.010
+0.00
1.58 -0.25
Chamfer
.016/0.41 Max. x 45°
Dim. D
.312±.016
7.93±0.41
.875±.016
Dia.
22.2±0.41
Slot: .032±.005/0.813±0.127 Wide X
.032+.010-.000/0.813+0.254-0.000 Deep
(Not on Rear Shaft Models)
OPTIONAL TERMINAL CONFIGURATION
40°
VIEW B
SLIDER
.625 R MAX
15.9 R MAX
.110
2.794
.020 Thickness
.060
±
.003
Dia.
1.524
±
.076
.062
±
.003
1.524
±
.076
Use Special Feature Code “FT” to order.
Enlarged View B
2-99
Model 7280 Series
OUTLINE DIMENSIONS (Inch/mm)
Model 7283
Servo Mount with Ball Bearing
Mounting Surface
.375±.031
9.53±0.79
.781
Dia. Max.
19.8
+.0000
.1248
-.0003
Dia.
+0.0000
3.1699
-0.0076
+.000
-.001
+0.000 Dia.
15.875
-0.025
.625
.057
Min.
1.45
.062±.005
1.58±0.13
Chamfer
.016/0.406 Max. x 45°
.062±.005
1.58±0.13
1.250±.031
31.75±0.79
.875±.016
22.2±0.41
.250
CCW 6.35
CW Min.
.625
R. Max.
15.9
105°
Max.
Clamp
Ears
Slider
.080±.001
Dia.
2.03±0.03
.875±.016
22.2±0.41
Housing Dia.
+.005
.875 -.010
+0.13 Dia.
22.2 -0.25
Clamp
.922
Dia. Max.
23.4
OPTIONAL TERMINAL CONFIGURATION
105° MAX
40°
VIEW B
SLIDER
.625 R MAX
15.9 R MAX
.110
2.794
.020 Thickness
.060
±
.003
Dia.
1.524
±
.076
.062
±
.003
1.524
±
.076
Enlarged View B
Use Special Feature Code “FT” to order.
METRIC CONVERSIONS
1 in.
1 oz.
25.4 mm
28.4 gm
1 oz.-in.
1 lb.-in.
0,007 N-m
0,113 N-m
2-100
Model 7280 Series
SPECIAL FEATURES
Center Tap
Linearity Tape
Rear Shaft Extension (7283, 7286 single cup only)
Flatted Shaft
Slotted Shaft (Standard on single cup 7286 without RS)
Shaft Lock (7281, 7286 only)
High Torque, 2–6 oz.-in. (7286 only)
Additional Gangs
Gold Plated Solder Lug Terminals (See Optional Terminal Configuration)
ORDERING INFORMATION
CT
LT
RS
FS
SS
SL
HT
2G
FT
2
7286 R 10K T2 L .25 XX
Model Series
Resistance Prefix
Resistance Value
Optional Special
Feature Code
Linearity
Optional
Non-Standard Tolerance
MATCHING TURNS COUNTING DIALS
7281: RBJ, 2601, 2641
7286: 2606, 2607, 2626, 2627, 2646, 2647, 2126, 2606S, 2607S, 2646S, 2647S, RB
CIRCUIT DIAGRAM
NOTES
(S)
(CCW)
(CW)
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
INCH
mm
2-101
Model 7280 Series
