MODEL 7280 SERIES 7/8” Diameter 10-Turn Wirewound 2 Precision Potentiometer MODEL STYLES 7281 7283 7284 7286 7288 (for heavy side load applications) NEW PRODUCT 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 ELECTRICAL Resistance Range, Ohms Standard Resistance Tolerance Minimum Practical Resistance Tolerance Independent Linearity Minimum Practical Independent Linearity 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 Power Rating, Watts Dielectric Strength Insulation Resistance, Minimum Noise, Maximum Actual Electrical Travel Tap Tolerance End Voltage, Maximum 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) 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) MECHANICAL Total Mechanical Travel Number of Gangs, Maximum Weight, Nominal (single gang) Backlash, Maximum 7281, 7284, 7286 60 oz.-in. 25 lb.-in. .010” .003” .004” .005” .003” 0.8 oz.-in. 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) 3600° + 15° – 0° 2 0.75 oz. 1° 7283 36 oz.-in. N/A .005” .002” .002” .004” .002” 0.6 oz.-in. STANDARD RESISTANCE VALUES, OHMS Total Resistance Theoretical Resolution (% Nominal) Tempco of Wire 100 200 500 1K 2K 5K 10K 20K 50K 100K 0.059 0.037 0.030 0.024 0.020 0.018 0.017 0.016 0.010 0.008 ±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) Models 7281, 7284 and 7286 Bushing Mount with Sleeve Bearing Dim. 7281 7284 7286 A .688 ± .031 17.475 ± 0.787 .812 ± .031 20.625 ± 0.787 .812 ± .031 20.625 ± 0.787 +0.0000 .2362 -0.0005 +0.0000 .2500 -0.0005 +0.0000 .1248 -0.0003 B 1.125±.031 28.58±0.79 .750±.016 19.1±0.41 Slider CCW CW 3.1699 +0.0000 -0.0076 .281 +0.000 -0.002 Mounting Surface Dim. A C .125 Min. 3.18 D +0.000 7.137 -0.051 Dia. 6.0000 +0.0000 -0.0127 .406 +0.000 -0.002 10.312 +0.000 -0.051 Dia. 1/4 - 32 UNEF Thread Dia. 6.3500 +0.0000 -0.0127 .406 +0.000 -0.002 10.312 +0.000 -0.051 Dia. 3/8 - 32 UNEF Thread 2 Dia. 3/8 - 32 UNEF Thread 75° Max. Dim. B Dia. .625 R Max. 15.9 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° .875±.016 Dia. 22.2±0.41 Dim. D .312±.016 7.93±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 .110 2.794 SLIDER .625 R MAX 15.9 R MAX .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 1.250±.031 31.75±0.79 .375±.031 9.53±0.79 .781 Dia. Max. 19.8 +.0000 .1248 -.0003 Dia. +0.0000 3.1699 -0.0076 .875±.016 22.2±0.41 .250 CCW 6.35 CW Min. Slider +.000 -.001 +0.000 Dia. 15.875 -0.025 .625 .080±.001 Dia. 2.03±0.03 .875±.016 22.2±0.41 Housing Dia. .057 Min. 1.45 .062±.005 1.58±0.13 Clamp Ears .625 R. Max. 15.9 105° Max. +.005 .875 -.010 +0.13 Dia. 22.2 -0.25 Chamfer .016/0.406 Max. x 45° .062±.005 1.58±0.13 Clamp .922 Dia. Max. 23.4 OPTIONAL TERMINAL CONFIGURATION .110 2.794 105° MAX .020 Thickness 40° .060 ± .003 Dia. 1.524 ± .076 VIEW B SLIDER .625 R MAX 15.9 R MAX .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 2-100 1 oz.-in. 1 lb.-in. 0,007 N-m 0,113 N-m 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) CT LT RS FS SS SL HT 2G FT ORDERING INFORMATION 7286 R 10K T2 L .25 XX Optional Special Feature Code Model Series Resistance Prefix Resistance Value 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 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. (S) (CCW) (CW) INCH mm Tolerances unless otherwise specified: Linear = ± .01 inches (.25mm) Angular = ± 2 degrees 2-101 Model 7280 Series 2