2
2-97 Model 7280 Series
MODEL 7280 SERIES
7/8” Diameter
10-Turn
Wirewound
Precision Potentiometer
ELECTRICAL
Resistance Range, Ohms 100 to 100K
Standard Resistance Tolerance ±5%
Minimum Practical Resistance Tolerance ±1%
Independent Linearity ±0.25%
Minimum Practical Independent Linearity ±0.15%, < 300 Ohms
±0.075%, ≥300 Ohms
Power Rating, Watts 2.0 at 70°C derating to 0 at 125°C
Dielectric Strength 1,000V rms
Insulation Resistance, Minimum 1,000 Megohms
Noise, Maximum 100 Ohms
Actual Electrical Travel 3600° + 10° – 0°, > 100 Ohms
3600° + 10° – 5°, ≤100 Ohms
Tap Tolerance ±3°
End Voltage, Maximum 0.25% of input voltage
MODEL STYLES
7281 1/8” Shaft, 1/4” Bushing
7283 1/8” Shaft, Servo
7284 6mm Shaft, 3/8” Bushing
7286 1/4” Shaft, 3/8” Bushing
7288 (for heavy side load applications) NEW PRODUCT 1/4” Shaft, 3/8” Bushing
Specifications subject to change without notice.
2-98 Model 7280 Series
MECHANICAL
Total Mechanical Travel 3600° + 15° – 0°
Number of Gangs, Maximum 2
Weight, Nominal (single gang) 0.75 oz.
Backlash, Maximum 1°
7281, 7284, 7286 7283
Static Stop Strength 60 oz.-in. 36 oz.-in.
Panel Nut Tightening Torque, Maximum 25 lb.-in. N/A
Shaft End Play, Maximum .010” .005”
Shaft Runout, T.I.R., Maximum .003” .002”
Pilot Diameter Runout, T.I.R., Maximum .004” .002”
Lateral Runout, T.I.R., Maximum .005” .004”
Shaft Radial Play, Maximum .003” .002”
Start/Run Torque, Maximum (per gang) 0.8 oz.-in. 0.6 oz.-in.
STANDARD RESISTANCE VALUES, OHMS
Theoretical
Total Resolution Tempco
Resistance (% Nominal) of Wire
100 0.059 ±20 ppm/°C
200 0.037 ±20 ppm/°C
500 0.030 ±20 ppm/°C
1K 0.024 ±20 ppm/°C
2K 0.020 ±20 ppm/°C
5K 0.018 ±20 ppm/°C
10K 0.017 ±20 ppm/°C
20K 0.016 ±20 ppm/°C
50K 0.010 ±20 ppm/°C
100K 0.008 ±20 ppm/°C
ENVIRONMENTAL (MIL-R-12934)
Operating Temperature Range Static: –55°C to +125°C
Dynamic: –40°C to +125°C
Temperature Cycling 5 cycles, –55°C to +125°C (5% ∆R)
Shock, 6ms Sawtooth 100G’s (0.1ms discontinuity max.)
Vibration 15G’s, 10 to 2,000 Hz (5% ∆R, 0.1ms discontinuity max.)
Moisture Resistance Five 24 hour cycles (3% ∆R)
High Temperature Exposure 1,000 hours at 125°C (5% ∆R)
Rotational Load Life 1 mil. shaft rev. + 900 hrs. at rated wattage at 70°C (5% ∆R)
Rotational Life Model 7288 (1 pound Side Load) 1 mil. shaft rev. + 900 hrs. at rated wattage at 70°C (5% ∆R)
2
2-99 Model 7280 Series
OUTLINE DIMENSIONS (Inch/mm)
.625
15.9 R Max.
.875±.016
22.2±0.41Dia.
75°
Max.
Slot: .032±.005/0.813±0.127 Wide X
.032+.010-.000/0.813+0.254-0.000 Deep
(Not on Rear Shaft Models)
Chamfer
.016/0.41 Max. x 45°
Dim. D
.312±.016
7.93±0.41
+.000
-.010
+0.00
-0.25
.062
1.58
.080±.001
2.03±0.03 Dia.
1.125±.031
28.58±0.79
Mounting Surface
Dim. A
Dim. B
Dim. C
.125
3.18 Min.
.750±.016
19.1±0.41
Slider
CCW
CW
Dim. 728672847281
A
B
C
D
.688 ± .031
17.475 ± 0.787
.812 ± .031
20.625 ± 0.787
.812 ± .031
20.625 ± 0.787
+0.0000
-0.0003
+0.0000
-0.0076
Dia.
.1248
3.1699
+0.0000
-0.0005
+0.0000
-0.0127
Dia.
.2362
6.0000
+0.0000
-0.0005
+0.0000
-0.0127
Dia.
.2500
6.3500
+0.000
-0.002
+0.000
-0.051
Dia.
.281
7.137
+0.000
-0.002
+0.000
-0.051
Dia.
.406
10.312
+0.000
-0.002
+0.000
-0.051
Dia.
.406
10.312
1/4 - 32 UNEF Thread 3/8 - 32 UNEF Thread 3/8 - 32 UNEF Thread
OPTIONAL TERMINAL CONFIGURATION
40°
SLIDER
.625 R MAX
15.9 R MAX
VIEW B
.110
2.794
.020 Thickness .060 ± .003
1.524 ± .076
.062 ± .003
1.524 ± .076
Enlarged View B
Dia.
Use Special Feature Code “FT” to order.
Models 7281, 7284 and 7286
Bushing Mount with Sleeve Bearing
2-100 Model 7280 Series
OPTIONAL TERMINAL CONFIGURATION
105°
Max.
Clamp
.922
23.4Dia. Max.
.625
15.9 R. Max.
Clamp
Ears
.875±.016
22.2±0.41
Housing Dia.
Slider
.080±.001
2.03±0.03Dia.
.057
1.45 Min.
.062±.005
1.58±0.13
.062±.005
1.58±0.13
Chamfer
.016/0.406 Max. x 45°
.625
15.875
+.000
-.001
+0.000
-0.025
.875
22.2
+.005
-.010
+0.13
-0.25
.1248
3.1699
+.0000
-.0003
+0.0000
-0.0076
Dia. Dia.
Dia.
Mounting Surface
.375±.031
9.53±0.79
.781
19.8 Dia. Max.
1.250±.031
31.75±0.79
.875±.016
22.2±0.41
.250
6.35
Min.
CCW
CW
OUTLINE DIMENSIONS (Inch/mm)
40°
SLIDER
.625 R MAX
15.9 R MAX
VIEW B
105° MAX
Use Special Feature Code “FT” to order.
.110
2.794
.020 Thickness .060 ± .003
1.524 ± .076
.062 ± .003
1.524 ± .076
Enlarged View B
Dia.
METRIC CONVERSIONS
1 in. 25.4 mm
1 oz. 28.4 gm
1 oz.-in. 0,007 N-m
1 lb.-in. 0,113 N-m
Model 7283
Servo Mount with Ball Bearing
2
2-101 Model 7280 Series
ORDERING INFORMATION
7286 R 10K T2 L .25 XX
Model Series
Resistance Prefix
Resistance Value
Optional Special
Feature Code
Linearity
Optional
Non-Standard Tolerance
(CCW)
(S)
(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
NOTES
mm
INCH
CIRCUIT DIAGRAM
MATCHING TURNS COUNTING DIALS
7281: RBJ, 2601, 2641
7286: 2606, 2607, 2626, 2627, 2646, 2647, 2126, 2606S, 2607S, 2646S, 2647S, RB
SPECIAL FEATURES
Center Tap CT
Linearity Tape LT
Rear Shaft Extension (7283, 7286 single cup only) RS
Flatted Shaft FS
Slotted Shaft (Standard on single cup 7286 without RS) SS
Shaft Lock (7281, 7286 only) SL
High Torque, 2–6 oz.-in. (7286 only) HT
Additional Gangs 2G
Gold Plated Solder Lug Terminals (See Optional Terminal Configuration) FT
