MODEL 7380 SERIES 7/8” Diameter 3–Turn Wirewound 2 Precision Potentiometer MODEL STYLES 7381 7383 7386 7388 (for heavy side load applications) NEW PRODUCT 1/8” Shaft, 1/4” Bushing 1/8” Shaft, Servo 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 100 to 30K ±5% ±1% ±0.30% (<500 Ohms) ±0.25% (≥500 Ohms) ±0.30%, < 500 Ohms ±0.20%, ≥ 500 Ohms 1.5 at 70°C derating to 0 at 125°C 1,000V rms 1,000 Megohms 100 Ohms 1080° + 10° – 0°, > 100 Ohms 1080° + 10° – 5°, ≤ 100 Ohms ±3° 0.25% of input voltage Minimum Practical Independent Linearity Power Rating, Watts Dielectric Strength Insulation Resistance, Minimum Noise, Maximum Actual Electrical Travel Tap Tolerance End Voltage, Maximum Specifications subject to change without notice. 2-103 Model 7380 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 7388 (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) 300K shaft rev. + 900 hrs. at rated wattage at 70°C (5% ∆R) 300K 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 7381, 7386 60 oz.-in. 25 lb.-in. .010” .003” .004” .005” .003” 1.2 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) 1080° + 15° – 0° 2 0.75 oz. 1° 7383 36 oz.-in. N/A .005” .002” .002” .004” .002” 0.9 oz.-in. STANDARD RESISTANCE VALUES, OHMS Total Resistance Theoretical Resolution (% Nominal) Tempco of Wire 100 200 500 1K 2K 5K 10K 20K 0.059 0.037 0.030 0.024 0.020 0.018 0.017 0.016 ±20 ppm/°C ±20 ppm/°C ±20 ppm/°C ±20 ppm/°C ±20 ppm/°C ±20 ppm/°C ±20 ppm/°C ±20 ppm/°C 2-104 Model 7380 Series OUTLINE DIMENSIONS (Inch/mm) Models 7381 & 7386 Bushing Mount with Sleeve Bearing Dim. 7381 7386 A .688±.013 17.475±0.787 .812±.031 20.625±0.787 B +.0000 -.0003 Dia. +0.0000 3.1699 -0.0076 +.0000 -.0005 Dia. +0.0000 6.3500 -0.0127 C +.000 -.002 Dia. +0.000 7.137 -0.051 +.000 -.002 Dia. +0.000 10.312 -0.051 D 1/4-32 UNEF Thread 3/8-32 UNEF Thread .1248 .2500 .281 1.125±.031 28.58±0.79 .750±.016 19.1±0.41 Slider CCW CW .080±.001 Dia. 2.03±0.03 Mounting Surface .406 Dim. A .125 Min. 3.18 Dim. B 75° Max. Dim. C .625 R Max. 15.9 Slot: .032±.005/0.813±0.127 Wide X .032+.010-.000/0.813+0.254-0.000 Deep (Not on Rear Shaft Models) +.000 -.010 +0.00 1.58 -0.25 .875±.016 Dia. 22.2±0.41 Chamfer Dim. D .016/0.41 Max. x 45° .062 .312±.016 7.93±0.41 OPTIONAL TERMINAL CONFIGURATION .110 2.794 40° VIEW B SLIDER .020 Thickness .060 ± .003 Dia. 1.524 ± .076 .625 R MAX 15.9 R MAX .062 ± .003 1.524 ± .076 Enlarged View B Use Special Feature Code “FT” to order. 2-105 Model 7380 Series 2 OUTLINE DIMENSIONS (Inch/mm) Model 7383 Servo Mount with Ball Bearing Mounting Surface 1.250±.031 31.75±0.79 Slider .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. +.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° Clamp .922 Dia. Max. 23.4 .062±.005 1.58±0.13 OPTIONAL TERMINAL CONFIGURATION .110 2.794 105° MAX 40° .020 Thickness VIEW B .060 ± .003 Dia. 1.524 ± .076 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 2-106 1 oz.-in. 1 lb.-in. 0,007 N-m 0,113 N-m Model 7380 Series SPECIAL FEATURES Center Tap Linearity Tape Rear Shaft Extension Flatted Shaft Slotted Shaft (Standard on single cup 7386 without RS) Shaft Lock (7381, 7386 only) High Torque, 2–6 oz.-in. (7386 only) Additional Gangs Gold Plated Solder Lug Terminals (See optional terminal configuration) CT LT RS FS SS SL HT 2G FT ORDERING INFORMATION 7386 R 10K T2 L .50 XX Optional Special Feature Code Model Series Resistance Prefix Resistance Value Linearity Optional Non-Standard Tolerance MATCHING TURNS COUNTING DIALS 7381: RBJ, 2601, 2641 7386: RB, 2126, 2606, 2606S, 2607, 2607S, 2626, 2627, 2646, 2646S, 2647, 2647S NOTES CIRCUIT DIAGRAM 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 2-107 Model 7380 Series 2