MODEL A 1-13/16” Diameter 10-Turn Wirewound 2 Precision Potentiometer ELECTRICAL Resistance Range, Ohms Standard Resistance Tolerance Minimum Practical Resistance Tolerance Independent Linearity Minimum Practical Independent Linearity 10 to 500K < 100 Ohms = ±5%, ≥ 100 Ohms = ±3% ±1% < 300 Ohms = ±0.50%, ≥ 300 Ohms = ±0.25% ±0.15%, ≤ 20 Ohms ±0.10%, < 100 Ohms ±0.075%, < 300 Ohms ±0.05%, ≥ 300 Ohms 5.0 at 40°C derating to 0 at 85°C 1,000Vdc not to exceed power rating 1,000V rms 1,000 Megohms 500 Ohms: RT ≤ 2613.7 Ohms 250 Ohms: RT > 2613.7 Ohms 3600° + 4° – 0° ≤ 20 Ohms = ±3°, < 100 Ohms = ±2° < 300 Ohms = ±1.5°, ≥ 300 Ohms = ±1° 10 Ohms = 3%, 25 Ohms = 1.2% 50 Ohms = 0.6%, ≥100 Ohms = 0.25% Power Rating, Watts Input Voltage, Maximum Dielectric Strength Insulation Resistance, Minimum Noise, Maximum Actual Electrical Travel Tap Tolerance End Voltage, Maximum (% of input voltage) This model available in a hybrid version – contact factory for details. ENVIRONMENTAL (MIL-R-12934) Operating Temperature Range Temperature Cycling Shock, 6ms Sawtooth Vibration Moisture Resistance High Temperature Exposure Rotational Load Life Static: –65°C to +85°C Dynamic: –40°C to +85°C 5 cycles, –65°C to +85°C (5% ∆R) 100G’s (0.1ms discontinuity max.) 6 hours, 10 to 55 Hz (5% ∆RT, 0.1ms discontinuity max.) Ten 24 hour cycles (3% ∆R) 1,000 hours at 85°C (5% ∆R) 2 mil. shaft rev. + 900 hrs. at rated wattage at 40°C (5% ∆R) Specifications subject to change without notice. 2-5 Model A MECHANICAL Total Mechanical Travel Number of Gangs, Maximum Weight, Nominal (Single Gang) Static Stop Strength Backlash, Maximum 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° + 4° – 0° 3 4.4 oz. 550 oz.-in. 1° 25 lb.-in. .005” .0005” .002” .003” .003” 3.0 oz.-in. STANDARD RESISTANCE VALUES, OHMS Total Resistance 10 25 50 100 200 500 1K 2K 5K 10K 20K 50K 100K 200K 300K 500K Theoretical Resolution (% Nominal) 0.082 0.040 0.031 0.040 0.031 0.024 0.021 0.016 0.014 0.011 0.009 0.007 0.006 0.005 0.005 0.005 Tempco of Wire +800 ppm/°C +800 ppm/°C +800 ppm/°C ±20 ppm/°C ±20 ppm/°C ±20 ppm/°C ±20 ppm/°C ±20 ppm/°C +130 ppm/°C +130 ppm/°C +130 ppm/°C +130 ppm/°C ±20 ppm/°C ±20 ppm/°C ±20 ppm/°C ±20 ppm/°C * * * * * * * * Lower tempco available as a special model. 2-6 Model A OUTLINE DIMENSIONS (Inch/mm) Mounting Surface .062±.016 1.58±0.41 .812±.031 20.6±0.79 RS M L Slider Dim. “M” Dim. “RS” No.of Gangs 2.062±.031 52.38±0.79 2.875±.031 73.03±0.79 1 4.243 Max. 107.78 5.016±.031 4.205±.031 106.81±0.79 127.41±.0.79 2 6.143 Max. 156.04 6.100±.031 154.94±0.79 6.906+.031 175.42±0.79 3 +.000 .406 -.002 Dia. +0.000 10.312 -0.051 +.0000 .2497 -.0003 Dia. +0.0000 6.3424 -0.0076 CW CCW 1.812±.016 46.03±0.41 Dia. .312±.025 7.93±0.64 Dim. “L” 2.016 Max. 51.21 1.250 R Max. 31.75 .562±.016 14.3±0.41 Chamfer .016 Max. x 45° 0.41 3/8 - 32 UNEF Thread .062±.016 1.58±0.41 .312±.016 7.93±0.41 2 & 3 Gang Outline Locating Lug .125±.005/3.175±0.127 Dia. Positioned as Shown ±5° METRIC CONVERSIONS 1 in. 1 oz. 25.4mm 28.4 gm 1 oz.-in. 1 lb.-in. 2-7 0,007 N-m 0,113 N-m Model A 2 SPECIAL FEATURE CODES Center Tap Linearity Tape Rear Shaft Extension Flatted Shaft Slotted Shaft Shaft Lock Color Coded Additional Gangs CT LT RS FS SS SL CC 2G or 3G ORDERING INFORMATION A R 10K T2 L .25 XX Optional Special Feature Code Model Series Resistance Prefix Linearity Resistance Value Optional Non-Standard Tolerance MATCHING TURNS COUNTING DIALS 2606, 2607, 2626, 2627, 2646, 2647, 2126, 2606S, 2607S, 2646S, 2647S, RB 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 2-8 Model A