MODEL A 1-13/16 Diameter 10-Turn Wirewound 2 Precision Potentiometer ELECTRICAL Resistance Range, Ohms 10 to 500K Standard Resistance Tolerance < 100 Ohms = 5%, 100 Ohms = 3% Minimum Practical Resistance Tolerance 1% Independent Linearity < 300 Ohms = 0.50%, 300 Ohms = 0.25% Minimum Practical Independent Linearity 0.15%, 20 Ohms 0.10%, < 100 Ohms 0.075%, < 300 Ohms 0.05%, 300 Ohms Power Rating, Watts 5.0 at 40C derating to 0 at 85C Input Voltage, Maximum 1,000Vdc not to exceed power rating Dielectric Strength 1,000V rms Insulation Resistance, Minimum 1,000 Megohms Noise, Maximum 500 Ohms: RT 2613.7 Ohms 250 Ohms: RT > 2613.7 Ohms Actual Electrical Travel 3600 + 4 0 Tap Tolerance 20 Ohms = 3, < 100 Ohms = 2 < 300 Ohms = 1.5, 300 Ohms = 1 End Voltage, Maximum 10 Ohms = 3%, 25 Ohms = 1.2% (% of input voltage) 50 Ohms = 0.6%, 100 Ohms = 0.25% This model available in a hybrid version contact factory for details. ENVIRONMENTAL (MIL-R-12934) Operating Temperature Range Static: 65C to +85C Dynamic: 40C to +85C Temperature Cycling 5 cycles, 65C to +85C (5% R) Shock, 6ms Sawtooth 100Gs (0.1ms discontinuity max.) Vibration 6 hours, 10 to 55 Hz (5% RT, 0.1ms discontinuity max.) Moisture Resistance Ten 24 hour cycles (3% R) High Temperature Exposure 1,000 hours at 85C (5% R) Rotational Load Life 2 mil. shaft rev. + 900 hrs. at rated wattage at 40C (5% R) Specifications subject to change without notice. 2-5 Model AMECHANICAL Total Mechanical Travel 3600 + 4 0 Number of Gangs, Maximum 3 Weight, Nominal (Single Gang) 4.4 oz. Static Stop Strength 550 oz.-in. Backlash, Maximum 1 Panel Nut Tightening Torque, Maximum 25 lb.-in. Shaft End Play, Maximum .005 Shaft Runout, T.I.R., Maximum .0005 Pilot Diameter Runout, T.I.R., Maximum .002 Lateral Runout, T.I.R., Maximum .003 Shaft Radial Play, Maximum .003 Start/Run Torque, Maximum (per gang) 3.0 oz.-in. STANDARD RESISTANCE VALUES, OHMS Theoretical Total Resolution Tempco Resistance (% Nominal) of Wire 10 0.082 +800 ppm/C * 25 0.040 +800 ppm/C * 50 0.031 +800 ppm/C * 100 0.040 20 ppm/C 200 0.031 20 ppm/C 500 0.024 20 ppm/C 1K 0.021 20 ppm/C 2K 0.016 20 ppm/C 5K 0.014 +130 ppm/C * 10K 0.011 +130 ppm/C * 20K 0.009 +130 ppm/C * 50K 0.007 +130 ppm/C * 100K 0.006 20 ppm/C 200K 0.005 20 ppm/C 300K 0.005 20 ppm/C 500K 0.005 20 ppm/C * Lower tempco available as a special model. 2-6 Model A