Precision Potentiometers

Transcription

1 Precision Potentiometers w w w. b o u r n s. c o m I. Product Selection Guide...58 II. Potentiometers Multiturn...60 Single-Turn...65 Knobpot...70 Pushbutton (Digital Readout)...7 III. Definitions & Test Procedures...74 Specifications are subject to change without notice. 57

2 Product Selection Guide Multiturn Precision Potentiometers Model Element Resistance Resistance Standard Pkg. Pkg. Shaft Page No. Turns Type Tolerance Range Linearity Dia. Depth Dia./Length Mount No. (Ohms) Wirewound ±3% K ±0.5% Wirewound ±3% 50-00K ±0.0% Wirewound ±5% 00-00K ±0.5% Hybritron ±0% K-00K ±0.5% Wirewound ±5% 0-50K ±0.5% Wirewound ±5% 50-50K ±0.5% -3/6-3/4 /4 X 3/6 (30mm) (46mm) (6 X mm) 7/8 /4 X 3/6 (mm) (5mm) (6 X mm) 7/8 3/4 /4 X 3/6 (mm) (9mm) (6 X mm) 7/8 3/4 /4 X 3/6 (mm) (9mm) (6 X mm) 7/8 3/4 /4 X 3/6 (mm) (9mm) (6 X mm) 7/8 3/4 /4 X 3/6 (mm) (9mm) (6 X mm) Bushing 60 Bushing 6 Bushing 6 Bushing 6 Bushing 63 Bushing Wirewound ±5% 00-00K ±0.5% 7/8 3/4 (mm) (9mm) Various Bushing 64 Single-Turn Precision Potentiometers Model Element Resistance Resistance Standard Pkg. Pkg. Shaft Page No. Type Tolerance Range Linearity Dia. Depth Dia./Length Mount No. (Ohms) Conductive ±0% K-00K ±% 7/8 / /8 X / Plastic (mm) (3mm) (3 X.7mm) Conductive ±0% K-00K ±% 7/8 9/3 /8 X / Plastic (mm) (5mm) (3 X.7mm) Conductive ±5% K-00K ±% 7/8 9/3 /8 X / Plastic (mm) (5mm) (3 x.7mm) Conductive ±0% K-00K ±0.% 9/3 /4 X 7/8 Plastic (5mm) (5mm) (6 X mm) Conductive ±0% K-00K ±% 7/8 9/6 /8 X 7/8 Plastic (mm) (4mm) (3 X mm) Conductive ±5% K-00K ±% 7/8 /3 /4 X 7/8 Plastic (mm) (7mm) (6 x mm) Conductive ±0% K-00K ±% -5/6 5/3 /4 X 7/8 Plastic (33mm) (0mm) (6 X mm) Servo 65 Servo 65 Servo 68 Servo 66 Bushing 67 Bushing 68 Bushing Specifications are subject to change without notice.

3 Product Selection Guide Knobpot Precision Potentiometers Model Element Resistance Resistance Pkg. Pkg. Shaft Page No. Turns Type Tolerance Range Accuracy Dia. Depth Dia./Length Mount No. (Ohms) See Wirewound ±5% 00-00K Data Sheet See Wirewound ±5% 00-00K Data Sheet 3/4 (9mm) 7/8 (mm) See Data N/A Bushing 70 Sheet See Data N/A Snap-in 7 Sheet Digital Pushbutton Potentiometers Model Element Resistance Resistance Pkg. Pkg. Shaft Page No. Digits Type Tolerance Range Accuracy Dia. Depth Dia./Length Mount No. (Ohms) See See See 368 Cermet ±3% 50- Meg Data Data Data N/A Snap-in 7 Sheet Sheet Sheet See See See Cermet ±3% 50- Meg Data Data Data N/A Snap-in 7 Sheet Sheet Sheet Specifications are subject to change without notice. 59

4 Bushing mount Optional ±0.05 linearity option Excellent wiper stability High stop strength Sealable Precision Potentiometer Electrical Characteristics Standard Resistance Range...00 to 500K ohms Resistance Tolerance...±3% Independent Linearity...±0.5% Resolution...See recommeded part number Effective Electrical Angle , -0 Absolute Minimum Resistance... ohm or 0.5% maximum (whichever is greater) Noise...00 ohms ENR maximum Power Rating (Voltage Limited By Power Dissipation, or...(40 C) 5 watts,000 VAC, Whichever Is Less)...(5 C) 0 watt Dielectric Withstanding Voltage...MIL-STD-0, Method 30 Sea Level...,000 VAC minimum 80,000 Feet VAC minimum Insulation Resistance (500 VDC)...,000 megohms minimum Environmental Characteristics Static Operation Temperature Range C to +5 C Dynamic Temperature Range...+ C to +5 C Temperature Coefficient...±0ppm/ C maximum/unit Moisture Resistance...MIL-STD-0, Method 03, Condition B Total Resistance Shift...±% maximum Vibration...0G Wiper Bounce...0. millisecond maximum Total Resistance Shift...±% maximum Voltage Ratio Shift...±0.% maximum Shock...50G Wiper Bounce...0. millisecond maximum Total Resistance Shift...±% maximum Voltage Ratio Shift...±0.% maximum Load Life...,000 hours, 5 watts Total Resistance Shift...±% maximum Rotational Life (No Load)...,000,000 shaft revolutions Total Resistance Shift...±5% maximum Mechanical Characteristics Mechanical Angle , -0 Shaft Runout in. (0.05mm) T.I.R. Shaft End Play in. (0.3mm) T.I.R. Shaft Radial Play in. (0.06mm) T.I.R. Pilot Diameter Runout in. (0.05mm) T.I.R. Lateral Runout in. (0.3mm) T.I.R. Stop Strength oz.-in. (388 Ncm) minimum Torque (Starting & Running)...0 oz.-in. (.4 Ncm) maximum Backlash...0 maximum Weight...Approximately 0G Terminals...Gold-plated solder lugs Markings...Manufacturer s name and part number, resistance value and tolerance, linearity tolerance, wiring diagram, date code Ganging... cups maximum WIPER 9.37 (-5/3) -3/6 (46.04).0 (.04) WIDE SLOT X.0 (.04) DEEP CW.5 (.06) / ±.79 (-3/4 ± /3) 0.64 (3/6) 4.76 (3/6) TYP..36 TYP. (.093) 3/8"-3 A THD UNEF 45 X.5 CHAMFER / -.05 ( / -.00) PILOT 39.4 ADD (.55) FOR ADDITIONAL CUP / -.0 ( / ) SHAFT 4.3 (9/6) 3.8 ANTI-ROTATION PIN (.5) EXTENDS.0 PAST MOUNTING SURFACE (.04) NOTE: LOCKWASHER AND HEX NUT TO BE SUPPLIED WITH EACH UNIT. 3 CW 6.35 (/4).5.3 DECIMALS:.XX ±.XXX ± (.00), (.005) FRACTIONS: ±/64 DIMENSIONS: ( IN.) WIPER Part Number Resistance Resolution 3400S--0, S--50 5, S--03 0, At room ambient: +5 C nominal and 50% relative humidity nominal, except as noted. Consult manufacturer for complete specification details for resistances below 500 ohms and above 00K ohms. 60 Specifications are subject to change without notice.

5 Bushing mount Sealable Non-standard features and specifications available Optional high torque feature Optional center tap feature Gangable Precision Potentiometer Electrical Characteristics Standard Resistance Range...50 to 00K ohms Resistance Tolerance...±3% Independent Linearity...±0.0% Resolution...See recommeded part numbers Effective Electrical Angle , -0 Absolute Minimum Resistance/Minimum Voltage... ohm or 0.% maximum (whichever is greater) Noise...00 ohms ENR maximum Power Rating (Voltage Limited By Power Dissipation or 35 VAC, Whichever Is Less) +70 C... watts +5 C...0 watt Dielectric Withstanding Voltage MIL-STD-0, Method 30 Sea Level...,500 VAC minimum 70,000 Feet VAC minimum Insulation Resistance (500 VDC)...,000 megohms minimum Environmental Characteristics Static Operation Temp Range C to +5 C Dynamic Temp Range...+ C to +5 C Temperature Coefficient...±50ppm/ C maximum/unit Vibration...0G Wiper Bounce...0. millisecond maximum Total Resistance Shift...±% maximum Voltage Ratio Shift...±0.% maximum Shock...00G Wiper Bounce...0. millisecond maximum Total Resistance Shift...±% maximum Voltage Ratio Shift...±0.% maximum Load Life...,000 hours, watts Total Resistance Shift...±% maximum Rotational Life (No Load)...,000,000 shaft revolutions Total Resistance Shift...±5% maximum Moisture Resistance...MIL-STD-0, Method 03,Condition B Total Resistance Shift...±% maximum Mechanical Characteristics Mechanical Angle , -0 Shaft Runout in. (0.05mm) T.I.R. Lateral Runout in. (0.3mm) T.I.R. Pilot Diameter Runout in. (0.05mm) T.I.R. Shaft End Play in. (0.3mm) T.I.R. Shaft Radial Play in. (0.08mm) T.I.R. Stop Strength...96 oz.-in. (67.8 Ncm) min. Torque (Starting & Running) oz.-in. (0.4 Ncm) max. Backlash...0 maximum Weight...Approximately 8G Terminals...Gold-plated solder lugs Ganging... cups maximum Part Number Resistance Resolution 3500S--0, S--50 5, S--03 0, S-/350H- WIPER 5.46 ±.76 (.5 ±.030) CW 8.0 ±.38 (.35 ±.05) 5.4 ±.5 (.00 ±.0) 0.64 ±.79 (3/6 ± /3) 6.0 (.63) R MAX. 45 ± 5.3 (7/8) 3/8"-3 A THD UNEF.5 X 45 CHAMFER (.00) / -.05 ( /-.00) PILOT.7 REF. (/) NOTE: LOCKWASHER AND HEX NUT TO BE SUPPLIED WITH EACH UNIT. NOTE: SHAFT LENGTH VARIATIONS 3500S--RC 3500S--RC 350H--RC.5 (.06) 45 ± (.35) /-.0 ( /-.0003) LOCATION OF OPTIONAL.9 A/R PIN ON R (7.37) ADJUSTMENT SLOT.8 WIDE X (.03).8 ±.5 DEEP (.03 ±.00).5.3 DECIMALS:.XX ±.XXX ± (.00), (.005) FRACTIONS: ±/64 3 CW /6 (7.46) 3/6 (0.64) 3/6 (0.64) WIPER At room ambient: +5 C nominal and 50% relative humidity nominal, except as noted. Consult manufacturer for complete specification details for resistances below 500 ohms. Specifications are subject to change without notice. 6

6 Bushing mount Optional center tap and rear shaft extension Optional AR lug feature Gangable with common or concentric shafts High torque available Optional 0.% linearity Non-standard features and specifications available 3540/354 - Precision Potentiometer Electrical Characteristics Wirewound Element Hybritron Element Standard Resistance Range...00 to 00K ohms...k to 00K ohms Resistance Tolerance...±5%...±0% Independent Linearity...±0.5%...±0.5% Resolution...See recommended part numbers Essentially infinite Effective Electrical Angle , , -0 Absolute Minimum Resistance/... ohm or 0.% maximum...minimum voltage Minimum Voltage (whichever is greater) 0.% maximum Noise...00 ohms ENR maximum...output smoothness 0.% maximum Power Rating (Voltage Limited By Power Dissipation or 447 VAC, Whichever Is Less) +70 C... watts... watts +5 C...0 watt...0 watt Dielectric Withstanding Voltage...MIL-STD-0, Method 30...MIL-STD-0, Method 30 Sea Level...,000 VAC minimum...,000 VAC minimum Insulation Resistance (500 VDC)...,000 megohms minimum...,000 megohms minimum 3540S-/354H- 8.3 (.7) 4.35 ±.38 (.565±.05) 3.5 (.06) 7.9 ±.38 (.3 ±.05) 9.05 ±.38 (.750 ±.05) 5.7 ±.38 (.5±.05) /.05 ( /-.00) 3/8" 3-UNEF-ATHD.5 X 45 CHAMFER (.00) ADJUSTMENT SLOT.8 WIDE (.03) X.8±.5 DEEP (.03±.00) / ( /-.0003) 0.6 ±.79 (.8 ±.03) Environmental Characteristics Static Operation Temp Range C to +5 C C to +5 C Dynamic Temp Range...+ C to +5 C...+ C to +5 C Temperature Coefficient...±50ppm/ C maximum/unit...±00ppm/ C maximum/unit Vibration...5G...5G Wiper Bounce...0. millisecond maximum...0. millisecond maximum Shock...50G...50G Wiper Bounce...0. millisecond maximum...0. millisecond maximum Load Life...,000 hours, watts...,000 hours, watts Total Resistance Shift...±%...±5% Rotational Life (No Load)...,000,000 shaft revolutions..5,000,000 shaft revolutions Total Resistance Shift...±5% maximum...±5% maximum Moisture Resistance...MIL-STD-0, Method 03,..MIL-STD-0, Method 03, Condition B Condition B Total Resistance Shift...±% maximum...±5% maximum Mechanical Characteristics Mechanical Angle , , - Shaft Runout in. (0.08mm) T.I.R in. (0.08mm) T.I.R. Lateral Runout in. (0.3mm) T.I.R in. (0.3mm) T.I.R. Pilot Diameter Runout in. (0.08mm) T.I.R in. (0.08mm) T.I.R. Shaft End Play in. (0.30mm) T.I.R (0.30mm) T.I.R. Shaft Radial Play in. (0.08mm) T.I.R (0.08mm) T.I.R. Stop Strength...75 oz-in. (53 Ncm) minimum..75 oz.-in. (53 Ncm) minimum Torque (Starting & Running) oz.-in. (0.35 Ncm) max oz.-in. (0.35 Ncm) max. Backlash...0 maximum...0 maximum Weight...Approximately G...Approximately.5G Terminals...Gold-plated solder lugs...gold-plated solder lugs Ganging... cups maximum... cups maximum At room ambient: +5 C nominal and 50% relative humidity nominal, except as noted. Consult manufacturer for complete specification details R MAX. (.65) OPTIONAL ANTIROTATION LUG (-9).4 X.50 ON 7.4 RADIUS. LENGTH.7 FROM MOUNTING SURFACE. (SUGGESTED PANEL HOLE.6 ) 30 ± (.5).3 ±.38 (.875 ±.05).45 (.49).5.3 DECIMALS:.XX ±.XXX ± (.00), (.005) FRACTIONS: ±/64 MTG. FACE 5.88 MIN. (.65) 3 CW WIPER Part Number Resistance Resolution 3540S S S--0, S--0, S--50 5, S--03 0, S--03, Part Number Resistance Resolution 3540S--03 0, S--03 0, S , S , H--0, H--50 5, H--03 0, Specifications are subject to change without notice.

7 Bushing mount Optional AR pin feature Non-standard features and specifications available Gangable 3543/ Precision Potentiometer Electrical Characteristics Turn 5-Turn Standard Resistance Range...0 to 50K ohms...50 to 50K ohms Resistance Tolerance...±5%...±5% Independent Linearity...±0.5%...±0.5% Resolution...See recommended part numbers See recommended part numbers Effective Electrical Angle , , -0 Absolute Minimum Resistance/... ohm or 0.% maximum... ohm or 0.% maximum Minimum Voltage (whichever is greater) (whichever is greater) Noise...00 ohms ENR maximum...00 ohms ENR maximum Power Rating (Voltage Limited By Power Dissipation or 4 VAC [3543] or 73 VAC [3545], Whichever Is Less) +70 C... watt...5 watt +5 C...0 watt...0 watt Dielectric Withstanding Voltage...MIL-STD-0, Method 30...MIL-STD-0, Method 30 Sea Level...,000 VAC minimum...,000 VAC minimum Insulation Resistance (500 VDC)...,000 megohms minimum...,000 megohms minimum Environmental Characteristics Static Operation Temp Range C to +5 C C to +5 C Dynamic Temp Range...+ C to +5 C...+ C to +5 C Temperature Coefficient...±50ppm/ C maximum/unit...±50ppm/ C maximum/unit Vibration...5G...5G Wiper Bounce...0. millisecond maximum...0. millisecond maximum Shock...50G...50G Wiper Bounce...0. millisecond maximum...0. millisecond maximum Load Life...,000 hours, watt...,000 hours,.5 watts Total Resistance Shift...±% maximum...±% maximum Rotational Life (No Load)...300,000 shaft revolutions...500,000 shaft revolutions Total Resistance Shift...±5% maximum...±5% maximum Moisture Resistance...MIL-STD-0, Method 03,..MIL-STD-0, Method 03, Condition B Condition B Total Resistance Shift...±% maximum...±% maximum Mechanical Characteristics Mechanical Angle , , -0 Shaft Runout in. (0.08mm) T.I.R in. (0.08mm) T.I.R. Lateral Runout in. (0.3mm) T.I.R in. (0.3mm) T.I.R. Pilot Diameter Runout in. (0.08mm) T.I.R in. (0.08mm) T.I.R. Shaft End Play in. (0.5mm) T.I.R in. (0.5mm) T.I.R. Shaft Radial Play in. (0.08mm) T.I.R in. (0.08mm) T.I.R. Stop Strength...75 oz.-in. (53 Ncm) min oz.-in. (53 Ncm) min. Torque (Starting & Running) oz.-in. (0.35 Ncm) max oz.-in. (0.35 Ncm) max. Weight...Approximately G...Approximately G Terminals...Gold-plated solder lugs...gold-plated solder lugs Backlash...0 maximum...0 maximum Ganging... cups maximum... cups maximum At room ambient: +5 C nominal and 50% relative humidity nominal, except as noted. Consult manufacturer for complete specification details. 3543S-/3545S- 8.3 (.7) 4.35 ±.38 (.565 ±.05) 3.5 (.06) 7.9 ±.38 (.3 ±.05) 9.05 ±.38 (.750 ±.05) 5.7 ±.38 (.5 ±.05) / -.05 ( /-.00) 3/8" 3-UNEF-ATHD 0.6 ±.79 (.8 ±.03) OPTIONAL ANTIROTATION LUG (-9).4 X.50 ON 7.4 RADIUS (.056 X.0) (.9) LENGTH.7 FROM MOUNTING SURFACE. (SUGGESTED PANEL HOLE.6 ) (.063) 30 ± (.5).3 ±.38 (.875 ±.05).5 X 45 CHAMFER (.00) ADJUSTMENT.8 SLOT WIDE (.03) X.8±.5 DEEP (.03±.060) / ( /-.0003) NOTE: LOCKWASHER AND MOUNTING NUTS SUPPLIED. ADD.75 (9) FOR ADDITIONAL CUPS (.65) R MAX..45 (.49).5.3 DECIMALS:.XX ±.XXX ± (.00), (.005) FRACTIONS: ±/64 MTG. FACE 5.88 MIN. (.65) 3 CW WIPER Part Number* Resistance Resolution (Ω) (%) 3543S--0, S--0, S--50 5, S--03 0, Part Number Resistance Resolution (Ω) (%) 3545S--0, S--0, S--50 5, S--03 0, Specifications are subject to change without notice. 63

8 Bushing mount Optional AR pin feature Plastic or metal shaft and bushings Wirewound Solder lugs or PC pins Sealable (Full body seal) Non-standard features and specifications available Precision Potentiometer Electrical Characteristics Standard Resistance Range...00 to 00K ohms Resistance Tolerance...±5% Independent Linearity...±0.5% Resolution...See recommended part numbers Effective Electrical Angle , -0 Absolute Minimum Resistance... ohm or 0.% maximum (whichever is greater) Noise...00 ohms ENR maximum Power Rating (Voltage Limited By Power Dissipation or 450 VAC, Whichever is Less) +40 C... watts +5 C...0 watt Dielectric Withstanding Voltage...MIL-STD-0, Method 30 Sea Level...,000 VAC minimum Insulation Resistance (500 VDC)...,000 megohms minimum Environmental Characteristics Static Operation Temperature Range C to +5 C Dynamic Operation Temperature Range...+ C to +5 C Temperature Coefficient...±50ppm/ C maximum/unit Vibration...5G Wiper Bounce...0. millisecond maximum Shock...50G Wiper Bounce...0. millisecond maximum Load Life...,000 hours, watts Total Resistance Shift...±% maximum Rotational Life (No Load)...,000,000 shaft revolutions Total Resistance Shift...±5% maximum Moisture Resistance...MIL-STD-0, Method 03, Condition B Total Resistance Shift...±% maximum Mechanical Characteristics Mechanical Angle , -0 Shaft Runout in. (0.3mm) T.I.R. Lateral Runout in. (0.0mm) T.I.R. Pilot Diameter Runout in. (0.08mm) T.I.R. Shaft End Play in. (0.5mm) T.I.R. Shaft Radial Play in. (0.3mm) T.I.R. Stop Strength...64 oz.-in. (45 Ncm) minimum Torque (Starting & Running) oz.-in. (0.40 Ncm) maximum (unsealed).5 oz.-in. (. Ncm) maximum (sealed) Mounting Torque in.-lbs. ( Nm) (plastic) 5-8 in.-lbs. (.7 - Nm) (metal) Backlash...0 maximum Terminals...Solder lugs or PC pins Weight...Approximately 9G NOTE: For Anti-Rotation pin add 9 after configuration dash number. Example: - becomes -9 to add AR pin. At room ambient: +5 C nominal and 50% relative humidity nominal, except as noted. Consult manufacturer for complete specification details for resistance below K ohms. 64 Resistance Resolution (Printed Circuit) (Solder Lug) (Ω) (%) 3590P S--0, P S--0, P S--50 5, P S--03 0, P S--03 0, P S , P S , ±.38 (.00 ±.05) 8.6 ±.4 (.73 ±.05).5 (.00) 7.9 (.3) STANDOFFS 5.54 R (.6) 5.08 ±.38 (.00 ±.05) 6.99 ±.38 (.75 ±.05) /-.3 ( /-.005) 3 BUSHING DIAMETER (SEE PART NUMBERS).8 (.03) ±.38 (.875 ±.05) SHAFT DIAMETER (SEE PART NUMBERS).9 (PLASTIC VERSIONS) (.047).8 ±.5 (METAL VERSIONS) (.03 ±.00).70 (.500) MOUNTING SURFACE RECOENDED PC BOARD MOUNTING HOLE LOCATIONS HOLE DIAMETER.08 (.08) FMS (.00) (.00) (.75) 0.6 ±.8 (.8 ±.03). (.48).5.3 DECIMALS:.XX ±.XXX ± (.0), (.005) FRACTIONS: ±/64.8 (.465) CW 3 SHAFT & BUSHING CONFIGURATIONS (Bushing - DxL, Shaft - D) (-) Plastic Bushing (3/8 x 5/6 ) and Shaft ( , -.00) (-) Metal Bushing (3/8 x 5/6 ) and Shaft ( , ) (-3) Sealed, Plastic Bushing (3/8 x 5/6 ) and Shaft ( , -.00) (-4) Sealed, Metal Bushing (3/8 x 5/6 ) and Shaft ( , ) (-5) Metric, Plastic Bushing (9mm x 7.94mm) and Shaft (6mm + 0, -.076mm) (-6) Metric, Metal Bushing (9mm x 7.94mm) and Shaft (6mm + 0, -.03mm) (-7) Metric, Sealed, Plastic Bushing (9mm x 7.94mm) and Shaft (6mm + 0, -.076mm) (-8) Metric, Sealed, Metal Bushing (9mm x 7.94mm) and Shaft (6mm + 0, -.03mm) CW Specifications are subject to change without notice.

9 Infinite resolution element Standard linearity:.0% Extended temperature range:-65 C to +5 C Extended life version (6538) Output smoothness: 0.% standard Molded-in rear terminals Non-standard features and specifications available 6537/ mm Precision Potentiometer Electrical Characteristics Standard Resistance Range...K to 00K ohms...k to 00K ohms Resistance Tolerance...±0%...±0% Independent Linearity...±%...±% Resolution...Essentially infinite...essentially infinite Effective Electrical Angle End Voltage...0.5% max...0.5% max Output Smoothness...0.%...0.% Power Rating (Voltage Limited By Power Dissipation or 300 VAC, Whichever is Less) +70 C... watt... watt +5 C...0 watt...0 watt Dielectric Withstanding Voltage...MIL-STD-0, Method 30...MIL-STD-0, Method 30 Sea Level VAC min VAC min. Insulation Resistance (500 VDC) megohms min....,000 megohms min. Environmental Characteristics Static Operation Temp Range C to +5 C C to +5 C Dynamic Temp Range...+ C to +5 C...+ C to +5 C Temperature Coefficient...±500ppm/ C max...±500ppm/ C max Moisture Resistance...MIL-STD-0, Method 06...MIL-STD-0, Method 06 Total Resistance Shift...±0% max...±0% max Vibration...5G...5G Wiper Bounce...0. millisecond max...0. millisecond max Total Resistance Shift...±5% max...±5% max Voltage Ratio Shift...±0.5% max...±0.5% max Shock...50G...50G Wiper Bounce...0. millisecond max...0. millisecond max Total Resistance Shift...±5% max...±5% max Voltage Ratio Shift...±0.5% max...±0.5% max Load Life...,000 hours, watt...,000 hours, watt Total Resistance Shift...±0% max...±0% max Rotational Life (No Load)...0,000,000 shaft rev s...0,000,000 shaft rev s Total Resistance Shift...±0% max...±0% max Mechanical Characteristics Mechanical Angle...Continuous...Continuous Backlash...0. max...0. max Shaft Runout in. (0.3mm) T.I.R in. (0.05mm) T.I.R. Shaft End Play in. (0.3mm) T.I.R in. (0.3mm) T.I.R. Shaft Radial Play (0.3mm) T.I.R in. (0.08mm) T.I.R. Pilot Diameter Runout in. (0.06mm) T.I.R in. (0.06mm) T.I.R. Lateral Runout in. (0.08mm) T.I.R in. (0.08mm) T.I.R. Torque (Starting & Running) oz.-in. (0.40 Ncm) max oz.-in. (0.8 Ncm) max. Terminals...Molded-in rear...molded-in rear (.06).3 (.875) 3.8 (.5) 30 ± 3 TYP BALL BEARING.3 (.875) 3.8 (.5).57 (.06) 45 ± 5.70 ±.38 (.500 ±.05) /-.008 (.06) ( /-.0003).5 30 ± 0 x (.00) CHAMFER.57 (.06).9 (4.80) R 5.08 R (.00).5 (.00) REF /-.0 ( /-.0005).70 ±.38 (.475 ±.05).57 (.06).57 (.06).70 ±.80 (.375 ±.03) 45 ± 5 x.5 (.00) CHAMFER.5 (.00) REF /-.0 ( /-.0005).70 ±.38 (.500 ±.03) 9.8 (.780) 9.8 (.780) Part Number Resistance (Ω) 6537S--03 0,000 Part Number Resistance (Ω) 6538S--0, S--0, S--50 5, S--03 0, DECIMALS:.XX ±.XXX ± (.00), (.005) FRACTIONS: ±/64 WIPER 3 CW At room ambient: +5 C nominal and 50% relative humidity nominal, except as noted. Specifications are subject to change without notice. 65

10 Servo mount style Shaft supported by front and rear precision ball bearings Non-standard features and specifications available Gangable up to 0 cups Precision Potentiometer Electrical Characteristics Standard Resistance Range...K to 00K ohms Resistance Tolerance...±0% Independent Linearity...±0.5% Effective Electrical Angle ± Minimum Voltage...0.% maximum (0.% at K ohms, 0.4% at K ohms) Resolution...Essentially infinite Power Rating (Voltage Limited By Power Dissipation or 350 VAC, Whichever is Less) +70 C... watts +5 C...0 watt Output Smoothness...0.% Dielectric Withstanding Voltage...MIL-STD-0, Method 30 Sea Level...,000 VAC minimum 70,000 Feet VAC minimum Insulation Resistance (500 VDC)...,000 megohms minimum 6.35 (.5) /-.5 ( /-.00) 5.4 ±.787 (.600 ±.03) MIN..36 (.093).57 (.06).03 (.080) MIN /-.007 ( /-.0003).5 (.00) X 45 CHAMFER / -.05 ( /-.00) 5.9 ±.80 (5/8 ± /3) Environmental Characteristics Static Operation Temperature Range C to +5 C Dynamic Operation Temperature Range...+ C to +5 C Temperature Coefficient...±500ppm/ C maximum Moisture Resistance...MIL-STD-0, Method 03, Condition B Total Resistance Shift...±0% maximum Vibration...5G Wiper Bounce...0. millisecond maximum Total Resistance Shift...±% maximum Shock...60G Wiper Bounce...0. millisecond maximum Rotational Life (No Load)...5,000,000 shaft revolutions Total Resistance Shift...±0% maximum Load Life...,000 hours,.5 watts Total Resistance Shift...±0% maximum Mechanical Characteristics Shaft Runout in. (0.05mm) T.I.R. Shaft End Play in. (0.08mm) T.I.R. Shaft Radial Play in. (0.08mm) T.I.R. Pilot Diameter Runout in. (0.05mm) T.I.R. Lateral Runout in. (0.08mm) T.I.R. Backlash...0. maximum Mechanical Angle...Continuous Torque (Starting & Running) oz.-in. (0.53 Ncm) maximum 90 MAX. 3 5 ± 3 5 ± DECIMALS:.XX ±.XXX ± (.05), (.005) FRACTIONS: ±/64 3 CW WIPER 9.59 (.65) MAX. Part Number* Resistance (W) 6574S--0, S--50 5, S--03 0,000 At room ambient: +5 C nominal and 50% relative humidity nominal, except as noted. 66 Specifications are subject to change without notice.

11 Bushing mount Excellent resolution High rotational life Non-standard features and specifications available Precision Potentiometer Electrical Characteristics Standard Resistance Range......K to 00K ohms Resistance Tolerance...±0% Independent Linearity...±% Effective Electrical Angle End Voltage...0.5% maximum Output Smoothness...0.% maximum Resolution...Essentially infinite Power Rating (Voltage Limited By Power Dissipation or 300 VAC, Whichever is Less) +70 C... watt +5 C...0 watt Dielectric Withstanding Voltage...MIL-STD-0, Method 30 Sea Level VAC minimum Insulation Resistance (500 VDC)...,000 megohms minimum Environmental Characteristics Static Operation Temp Range C to +5 C Dynamic Temp Range...+ C to +5 C Temperature Coefficient...±500ppm/ C maximum Moisture Resistance...MIL-STD-0, Method 06 Total Resistance Shift...±0% maximum Vibration...5G Wiper Bounce...0. millisecond maximum Total Resistance Shift...±5% maximum Voltage Ratio Shift...±0.5% maximum Shock...50G Wiper Bounce...0. millisecond maximum Total Resistance Shift...±5% maximum Voltage Ratio Shift...±0.5% maximum Rotational Life (No Load)...0,000,000 shaft revolutions Total Resistance Shift...±0% maximum Load Life...,000 hours, watt Total Resistance Shift.±0% maximum Mechanical Characteristics Mechanical Angle...Continuous Backlash...0.º maximum Shaft Runout in. (0.05mm) T.I.R. Shaft End Play in. (0.3mm) T.I.R. Shaft Radial Play in. (0.3mm) T.I.R. Torque (Starting & Running) oz.-in. (0.40 Ncm) max. Part Numbers Resistance (W) 6637S--0, S--50 5, S--03 0, /8" ().57 (.06).5 ±.38 (.443 ±.05).3 (7/8) 3.8 (/8) CW BOURNS 3 30 ± 3 TYP /-.05 ( /-.00) 3/8-3 UNEF-THD /-.008 ( /-.0003).5 45 X (.00) CHAMFER 9.53 ±.79 (3/8 ± /3).3 ±.79 (7/8 ± /3) SHAFT SLOT.8 (.03) WIDE X.8 (.03) DEEP NOTE: SHAFT SUPPORTED BY FRONT SLEEVE BEARING. 3 CW WIPER 4.83 (.9) R At room ambient: +5 C nominal and 50% relative humidity nominal, except as noted. Specifications are subject to change without notice. 67

12 Essentially infinite resolution Excellent rotational life High quality, rugged construction General purpose applications Non-standard features available Cost and space saving 6539/ Precision Potentiometer At room ambient: +5 C nominal and 50% relative humidity nominal, except as noted Servo Mount Bushing Mount Electrical Characteristics Standard Resistance Range...K to 00K ohms...k to 00K ohms Resistance Tolerance Standard...±5%...±5% Independent Linearity Standard...±.0%...±.0% Resolution...Essentially infinite...essentially infinite Effective Electrical Angle End Voltage...0.5% maximum...0.5% maximum Output Smoothness...0.%...0.% Power Rating (Voltage Limited By Power Dissipation or 300 VAC, Whichever is Less) +70 C...0 watt...0 watt +5 C...0 watt...0 watt Dielectric Withstanding Voltage...MIL-STD-0, Method 30...MIL-STD-0, Method 30 Sea Level VAC minimum VAC minimum Insulation Resistance (500 VDC) megohms minimum megohms minimum Environmental Characteristics Static Operation Temp Range C to +5 C C to +5 C Dynamic Temp Range...+ C to +5 C...+ C to +5 C Vibration...5G...5G Wiper Bounce...0. millisecond maximum...0. millisecond maximum Shock...50G...50G Wiper Bounce...0. millisecond maximum...0. millisecond maximum Rotational Life (No Load)...0,000,000 shaft...0,000,000 shaft revolutions revolutions Total Resistance Shift...±0% maximum...±0% maximum Mechanical Characteristics Mechanical Angle...Continuous, Stops...Continuous, Stops (340 +8, -0 ) available (340º +8º -0º) available Backlash...0.º maximum...0.º maximum Shaft Runout in. (0.3mm) T.I.R in. (0.3mm) T.I.R. Shaft End Play in. (0.3mm) T.I.R in. (0.3mm) T.I.R. Shaft Radial Play in. (0.3mm) T.I.R in. (0.3mm) T.I.R. Pilot Diameter Runout in. (0.06mm) T.I.R. Lateral Runout in. (0.08mm) T.I.R. Torque (Starting & Running) oz.-in. (0.40 Ncm) max oz.-in. (0.40 Ncm) max. Terminals...Rear Turret Type...Rear Turret Type Bearing Type...Brass Sleeve...Nickel Plated Brass Markings...Manufacturer s name,...manufacturer s name, part number, resistance part number, resistance value and tolerance, value and tolerance, linearity tolerance, linearity tolerance, wiring diagram and wiring diagram and date code. date code. Part Number Resistance (Ω) 6539S--0, S--50 5, S--03 0,000 Part Numbers Resistance Bushing Mount Mechanical Stops (Ω) 6639S S-30-0, S--0, S S , S S , S--03 0, (.875) (.875) 65/ ±.38 (.500 ±.05) 3.8 (.5).5 ±.38 (.443±.05).57 (.06) 3.8 (.5) CW BOURNS 3 30 ± 3 TYP..5 3/8" - 3 UNEF (.00) REF 9.53 ±.79 (.375 ±.03).3 ±.76 (.875 ±.03) 3 CW.57 (.06).57 (.06).57 (.06).5 (.00) REF WIPER /-.008 ( /-.0003) SHAFT.5 30 ± 0 x (.00) CHAMFER /-.0 ( /-.0005) 9.8 (.780).70 ±.79 (.500 ±.03) /-.05 ( /-.00) /-.008 ( /-.0003) SHAFT.5 30 ± 0 ± (.00) CHAMFER.9.60 SLOT (.047) X (.063).38.3 DECIMALS:.XX ±.XXX ± (.05) (.005) FRACTIONS: ±/ R (.8) 68 Specifications are subject to change without notice.

13 Bushing mount Shaft supported by front sleeve bearing Non-standard features and specifications available Precision Potentiometer Electrical Characteristics Standard Resistance Range...K to 00K ohms Resistance Tolerance...±0% Independent Linearity...±% Resolution...Essentially infinite Effective Electrical Angle ±3 End Voltage...0.5% maximum Output Smoothness...0.% Power Rating (Voltage Limited By Power Dissipation or 300 VAC, Whichever is Less) +70 C...5 watts +5 C...0 watt Dielectric Withstanding Voltage...MIL-STD-0, Method 30 Sea Level VAC minimum Insulation Resistance (500 VDC)...,000 megohms minimum Environmental Characteristics Static Operation Temperature Range C to +5 C Dynamic Operation Temperature Range...+ C to +5 C Temperature Coefficient...±500ppm/ C maximum Vibration...5G Wiper Bounce...0. millisecond maximum Total Resistance Shift...±5% maximum Voltage Ratio Shift...±0.5% maximum Shock...50G Wiper Bounce...0. millisecond maximum Total Resistance Shift...±5% maximum Voltage Ratio Shift...±0.5% maximum Load Life...,000 hours,.5 watts Total Resistance Shift...±0% maximum Rotational Life (No Load)...0,000,000 shaft revolutions Total Resistance Shift...±0% maximum Moisture Resistance...MIL-STD-0, Method 06 Total Resistance Shift...±5% maximum Mechanical Characteristics Mechanical Angle...Continuous Backlash...0. maximum Shaft Runout in. (0.05mm) T.I.R. Shaft End Play in. (0.3mm) T.I.R. Shaft Radial Play in. (0.3mm) T.I.R. Torque (Starting & Running) oz.-in. (0.40 Ncm) maximum At room ambient: +5 C nominal and 50% relative humidity nominal, except as noted (-5/6).57 (.06) 6.46 ±.38 (.648 ±.05) 3.8 (/8) CW BOURNS 3 30 ± 3 TYP /-.05 ( /-.00) SHAFT 3/8"-3 UNEF-ATHD /-.008 ( /-.0003) SHAFT.5 45 X (.00) CHAMFER 9.53 ±.79 (3/8± /3).3 ±.79 (7/8 ± /3) SHAFT SLOT.9 WIDE (.047).60 X DEEP (.063).5.3 DECIMALS:.XX ±.XXX ± (.00), (.005) FRACTIONS: ±/64 WIPER 6.35 R (.5) 3 CW Part Number* Resistance (Ω) 6657S--0, S--0, S--50 5, S--03 0,000 Specifications are subject to change without notice. 69

14 Bushing mount Cost saving; pre-phased Highly readable clockface readout Easy mounting Precision Potentiometer Electrical Characteristics Standard Resistance Range...00 to 00K ohms Resistance Tolerance...±5% Accuracy (Correlation of Dial Readout to Voltage Ratio Output)...±0.5% voltage ratio Repeatability of Dial Readout...±0.% voltage ratio Resolution...See recommended part numbers Effective Electrical Angle nominal Absolute Minimum Resistance... ohm or 0.% maximum (whichever is greater) Noise...00 ohms ENR maximum Power Rating (Voltage Limited By Power Dissipation or 385 VAC, Whichever is Less) +5 C...5 watts +85 C...0 watt Dielectric Withstanding Voltage...MIL-STD-0, Method 30 Sea Level...,000 VAC minimum 70,000 Feet VAC minimum Insulation Resistance (500 VDC)...,000 megohms minimum Environmental Characteristics Static Operation Temperature Range C to +85 C Dynamic Operation Temperature Range...+ C to +85 C Temperature Coefficient...±50ppm/ C maximum/unit Moisture Resistance...MIL-STD-0, Method 03, Condition B Total Resistance Shift...±% maximum Vibration...0G Wiper Bounce...0. millisecond maximum Total Resistance Shift...±% maximum Voltage Ratio Shift...±0.% maximum Shock...50G Wiper Bounce...0. millisecond maximum Total Resistance Shift...±% maximum Voltage Ratio Shift...±0.% maximum Load Life...,000 hours,.5 watts Total Resistance Shift...±% maximum Rotational Life (No Load)...00,000 shaft revolutions Total Resistance Shift...±% maximum Mechanical Characteristics Mechanical Angle , -0 Stop Strength...0 oz.-in. (4 Ncm) minimum Torque (Starting & Running) oz.-in. (.8 Ncm) maximum Variation...0 oz.-in. (0.7 Ncm) maximum Backlash...0 maximum Weight...Approximately 7G Terminals...Gold-plated J-Hooks Markings...Manufacturer s name and part number, resistance value and date code At room ambient: +5 C nominal and 50% relative humidity nominal, except as noted. Consult manufacturer for complete specification details for resistances below 00 ohms. 9.0 (3/4) NON-TURN PIN EXTENDS.70 ±.3 (.067 ±.005) 5.40 ±.80 (.00 ±.03) KNOBPOT (3/4) 8.73 (/3) NON-TURN PIN EXTENDS.70 ±.3 (.067 ±.005) 7. (.80) 0.4 ±.08 (.40 ±.003) PANEL HOLE PATTERN LOCKWASHER AND MOUNTING NUT TO BE SUPPLIED WITH EACH UNIT WIPER PILOT 0.6 ±.05 (.404 ±.00) 3/8"-3UNEF-ATHD 3.96 (.56) MAX. -.5 (.060) MIN. PANEL THICKNESS # AWG GOLD PLATED GRADE A.74 NICKEL SOLDER LUGS (.085) LOCATED ON.05 RADIUS 3.8 ±.79 (/8 ±/3).40 ±.38 (.055 ±.05) I.D ±.79 (3/6 ± /3) / -.03 ( /-.00).5.3 DECIMALS:.XX ±.XXX ± (.00), (.005) FRACTIONS: ±/64 Part Number Resistance Resolution (Ω) (%) 3600S--0, S--50 5, S--03 0, CW 70 Specifications are subject to change without notice.

15 Snap-in mounting Space saving - extends only 5/8 behind most panels Easy one-hole, snap-in mounting Digital dial provides excellent readability Precision Potentiometer Electrical Characteristics Standard Resistance Range...00 to 00K ohms Resistance Tolerance...±5% Accuracy (Correlation of Dial Readout to Voltage Ratio Output)...±0.5% voltage ratio Repeatability of Dial Readout...±0.% voltage ratio Resolution...See recommended part numbers Effective Electrical Angle nominal Absolute Minimum Resistance... ohm or 0.% maximum (whichever is greater) Noise...00 ohms ENR maximum Power Rating (Voltage Limited By Power Dissipation or 385 VAC, Whichever is Less) +5 C...5 watts +85 C...0 watt Dielectric Withstanding Voltage...MIL-STD-0, Method 30 Sea Level...,000 VAC minimum 70,000 Feet VAC minimum Insulation Resistance (500 VDC)...,000 megohms minimum Environmental Characteristics Static Operation Temperature Range...-5 C to +85 C Dynamic Operation Temperature Range...+ C to +85 C Temperature Coefficient...±50ppm/ C maximum/wire Moisture Resistance...MIL-STD-0, Method 03, Condition B Total Resistance Shift...±% maximum Vibration...0G Wiper Bounce...0. millisecond maximum Total Resistance Shift...±% maximum Voltage Ratio Shift...±0.% maximum Shock...50G Wiper Bounce...0. millisecond maximum Total Resistance Shift...±% maximum Voltage Ratio Shift...±0.% maximum Load Life...,000 hours,.5 watts Total Resistance Shift...±% maximum Rotational Life (No Load)...50,000 shaft revolutions Total Resistance Shift...±% maximum Mechanical Characteristics Mechanical Angle , -0 Stop Strength...0 oz.-in. (4 Ncm) minimum Torque (Starting & Running) oz.-in. (.8 Ncm) maximum Variation...0 oz.-in. (0.7 Ncm) maximum Backlash...0 maximum Weight...Approximately 0G Terminals...Gold-plated J-Hooks Markings...Manufacturer s name and part number, resistance value and date code At room ambient: +5 C nominal and 50% relative humidity nominal, except as noted. Consult manufacturer for complete specification details for resistances below 500 ohms and above 00K ohms..3 (7/8) 4.7 (.56) VIEW ROTATED 45 ANTIROTATION KEY PANEL HOLE PATTERN 3.64 (NO. 30 DRILL) (.85) 3 FULL R WIPER.65 REF. (.498) 5.40 (.00) NOTES:. SNAP-IN MOUNTING CUP ACCOODATES PANEL THICKNESS.64 (.05) THRU.98 (.078) (NO. GA 3.8 THRU NO. 4GA) AND (.5) 8.80 ±.38 (.740 ±.05) 6.6 ±.38 (.640 ±.05) 4.76 ±.79 (3/6 ± /3).5.3 DECIMALS:.XX ±.XXX ± (.00), (.005) FRACTIONS: ±/64 ANTIROTATION KEY # AWG GOLD PLATED PINS.74 (.085) LOCATED ON.7 RADIUS (.050) (.40) 3 CW Part Number Resistance Resolution (W) (%) 360S--0, S--50 5, S--03 0,000.0 Specifications are subject to change without notice. 7

16 Repeatable settings Resolution to 0.00% Digital display provides excellent readability Snap-in panel mount Precision Potentiometer Electrical Characteristics Standard Resistance Range...50 ohms to megohm Resistance Tolerance...±3% Absolute Minimum Resistance...3 ohms or 0.% maximum (whichever is greater) Resolution % % Insulation Resistance (500 VDC)...,000 megohms minimum Power Rating (Voltage Limited By Power Dissipation or 500 VAC, Whichever is Less) +5 C... watts +85 C...0 watt Dielectric Withstanding Voltage...MIL-STD-0, Method 30 Sea Level...,000 VAC minimum Accuracy (Dial Reading to Output Ratio)...±0.5% full scale 3680 a 3 3 Environmental Characteristics Range...-5 C to +85 C Temperature Coefficient...±00ppm/ C maximum Vibration...0G Wiper Bounce...0. millisecond maximum Total Resistance Shift...±% maximum Voltage Ratio Shift...±0.% maximum Shock...50G Wiper Bounce...0. millisecond maximum Total Resistance Shift...±% maximum Voltage Ratio Shift...±0.% maximum Load Life...,000 hours, watts Total Resistance Shift...±% maximum Mechanical Characteristics Expected Life...75,000 button operations each decade Total Resistance Shift...±% maximum Terminals...0. in. (.79mm) wide x.06 in. (.4mm) thick, tinned solder lugs for 3 #0 AWG wires Readout Marking...0 positions, 0-9 Markings...Manufacturer s name and part number, resistance value and date code e c b 7.87 (.3) d 7.77 ±.38 (.306 ±.05) At room ambient: +5 C nominal and 50% relative humidity nominal, except as noted. NOTE: Terminals & 3 are reversed from illustration for models 368 and (.80) 3.6 (.93) Model Dimensions Weight (Approx.) a b c d e ±.05 (±.38) oz. gms (.050) 5.5 (.990) 0.67 (.40).94 (.47) 8.38 (.330) (.460) 35.3 (.390) 8.54 (.730).94 (.47) 4.9 (.65) Dimensions Model f ±.00 (±.54) g ±.00 (±.54) (.830) 5.9 (.00) (.830) (.40) Resistance 368S- 3683S- (Ω) 3 Decade Decade, , K K K -04 RECOENDED PANEL CUTOUT g.030 (.76) R MAX. f 8.38 ±.38 (.33 ±.05) PANEL.8 MIN. (.03) MAX. 3.8 (.5) WIPER 3 INCR (.050).38.3 DECIMALS:.XX ±.XXX ± (.05) (.005) FRACTIONS: ±/ (.5) 7 Specifications are subject to change without notice.

17 For use with Model 3680 digital pushbutton precision potentiometer H Panel Seal Assembly Physical Characteristics Material (Boot)...Clear silicone rubber Material (Frame)...Rigid black plastic Expected Life...00,000 actuations minimum Weight H Approximately 8.50G H Approximately 9.9G H-385 MOUNTING INSTRUCTIONS. Cut out and drill panel per chart.. Install snap-in potentiometer. 3. Locate silicone boot 3 and frame 4 over potentiometer and holes. 4. Attach panel seal assembly to panel with two #6 screws (not supplied). Application Data Protects front of the pot from unwanted entry of rain, dust, grease or oils Transparent for easy viewing of numerals Tear resistant for long life Matte finish black plastic frame to complement most front panels 3 4 Bourns Model H-385 Panel Seal Assembly minimizes accidental entry of liquids or foreign matter through the front of the Model 3680 Family Potentiometer. PANEL CUT-OUT/HOLE DIMENSIONS RECOENDED HOLE FOR TWO #6 SCREWS (NOT SUPPLIED) 0.54 ±.3 (.45 ±.005).08 ±.5 (.830 ±.00).5 "C" ± (.00).5 "A" ± (.00) 4.40 ±.38 (.63 ±.05) 6.73 ±.3 (.65 ±.005).5 "B" ± (.00) Frame Panel Cutout/ For Use With Part Number Dimensions Hole Dimensions C A B 368 H (.99) 5.9 (.00) (.550) 3683 H (.39) (.40) (.950) At room ambient: +5 C nominal and 50% relative humidity nominal, except as noted. Specifications are subject to change without notice. 73

18 Definitions and Test Procedures Cermet Elements Cermet elements are available in a wide range of resistance values and tapers. They offer essentially infinite resolution and excellent stability in the most severe environmental conditions. Static and dynamic noise (CRV) performance is good but not as good as that of conductive plastic. The temperature coefficient of cermet elements, though not as good as wirewound elements, is better than conductive plastic or carbon type elements. Linearity is quite good for a film type element and can be improved considerably for greater dial setting accuracy by laser tailoring. Frequency response of cermet materials is very good and the practical application range extends well beyond 00 MHZ. Conductive Plastic Elements Conductive plastic is a thick film ink, similar to cermet, but has a smoother surface. This characteristic offers several operational advantages over cermet. Dynamic noise characteristics (CRV or output smoothness) and rotational life are measurably improved as a result of the surface smoothness. Resolution is essentially infinite. Conductive plastic elements are generally available in a wide range of resistance values and tapers. Moisture resistance, temperature coefficient, power dissipation and wiper current capacity for conductive plastic elements are not as good as cermet elements. Wirewound Elements Wirewound elements offer good stability, excellent linearity, low noise, high power capabilities and good operational life. Wirewound elements offer a wide selection of resistance values up to 500k ohms. One primary limitation of wirewound elements is the finite resolution steps, which result from the wiper moving from turn to turn. (These steps are distinct, sudden, repeatable changes in output.) Resolution improves as resistance values increase due to the manufacturing processes whereby smaller wire and a higher number of turns are utilized. In systems that might be sensitive to such discrete steps, care should be taken to select an element with resolution fine enough to avoid difficulty. The many turns of resistance wire exhibit an inductive reactance that increases directly with frequency. This effect is most noticeable in low total resistance elements because the inductive reactance can be larger than the resistance, even at frequencies as low as 0KHZ. The performance of wirewound elements is also affected by inherent capacitance. Capacitance exists from turn to turn and also between the winding and the mandrel. Capacitance effects are most significant in high total resistance elements. Hybritron Elements This element is a combination of a wirewound element with a conductive plastic coating. It exhibits the temperature coefficient and resistance stability approaching a pure wirewound element. It displays the long operational life, essentially infinite resolution and low noise characteristics of the pure conductive plastic elements. The combination of the two provides the major benefits of both types of elements. Not recommended in applications requiring high wiper currents. CAUTION: CONDUCTIVE PLASTIC AND HYBRITRON ELEMENTS SHOULD BE APPLIED IN VOLTAGE DIVIDER CIRCUITS ONLY. Absolute Minimum Resistance The resistance measured between the wiper terminal and either end terminal when the wiper is positioned to give a minimum value on the measuring device. TEST PROCEDURE The wiper shall be positioned at one end of the resistance element so that a minimum value of resistance shall be measured as specified between the wiper and the corresponding end terminal. The same procedure shall be followed for the opposite end of the resistance element. Contact Resistance Variation (CRV) The apparent resistance seen between the wiper and the resistance element when the wiper is energized with a specified current and moved over the adjustment travel in either direction at a constant speed. The output variations are measured over a specified frequency bandwidth, exclusive of the effects due to roll-on or roll-off of the terminations and expressed in ohms or percent of total resistance test procedure CRV shall be tested using the circuit as shown in Fig. on page 53 of Potentiometer Handbook (or its equivalent). The operating shaft shall be rotated in both directions through 90% of the adjustment travel for a total of 6 cycles. Only the last 3 cycles shall count in determining whether or not a contact resistance variation is observed at least twice in the same area (within 5%), exclusive of the roll-on or roll-off points where the wiper moves from the termination, on or off, the resistance element. The rate of rotation of the operating shaft shall be such that the wiper completes cycle in 5 seconds, minimum, to minutes, maximum. The test current used shall be in accordance with the table below, unless otherwise specified. Test Current (±0%) Total Resistance Range 30 ma 50 Ohms 0 ma = or >50 Ohms to <500 Ohms ma = or >500 Ohms to <00K Ohms 00 ua = or >00K Ohms to < Megohms 50 ua = or > Megohms Dielectric Withstanding Voltage The ability to withstand under prescribed conditions, a specified potential of a given characteristic between the terminals of each cup and exposed conducting surface of the potentiometer, or between the terminals of each cup and the terminals of every other cup in the assembly without exceeding a specified leakage current value. TEST PROCEDURE The magnitude of the test voltage shall be specified. Connect the equipment by applying the high voltage source between the potentiometer terminals (interconnected) and the shaft or case. Raise the test voltage from zero to the proper maximum value at a rate of 500 volts per second maximum. Maintain the test voltage at this level while operating the shaft through one full sweep of its mechanical travel in a time interval of not less than 5 seconds nor more than 60 seconds. Monitor the 74 Specifications are subject to change without notice.

19 Definitions and Test Procedures leakage current indicating device throughout this test for evidence of damage, arcing, breakdown, or leakage current in excess of milliampere. Upon completion of the test, prior to disconnecting the leads, gradually reduce the test voltage to zero. For ganged potentiometers, repeat the foregoing applying the high voltage between the terminals of each cup and the terminals of every other cup on the potentiometer under test. Equivalent Noise Resistance (ENR) Any spurious variation in the electrical output not present in the input, defined quantitatively in terms of an equivalent parasitic transient resistance in ohms, appearing between the contact and the resistance element when the shaft is rotated or translated. The equivalent noise resistance is defined independently of the resolution, the functional characteristics, and the total travel. The magnitude of the equivalent noise resistance is the maximum departure from a specified reference line. The wiper of the potentiometer is required to be excited by a specified current and moved at a specified speed. TEST PROCEDURE The potentiometer shaft is cycled not less than ten times over a minimum of 95% of the electrical continuity travel within the rated travel speed of the potentiometer just prior to making noise measurements. The potentiometer shaft is then connected mechanically to the constant speed drive and electrically connected to the test circuit. With the constant speed drive engaged, the potentiometer noise characteristic may then be noted on the oscilloscope as the wiper traverses one complete cycle over the full electrical continuity travel and the maximum values are compared to the specified limit. If only random spikes of noise are noted, the potentiometer should be cycled again. If the random spikes are repetitive, the maximum values should be noted. Otherwise do not consider the initial measurements as noise. Independent Linearity The maximum deviation expressed as a percent of the total applied voltage, of the actual function characteristic from a straight line whose slope and position minimize the maximum deviations over the actual electrical travel, or any specified portion thereof. TEST PROCEDURE Consult factory. Insulation Resistance The resistance to a specified impressed DC voltage between the terminals of each cup and the exposed conducting surfaces of the potentiometer, or between the terminals of each cup and the terminals of every other cup in the gang, under prescribed conditions. TEST PROCEDURE Interconnect all electrically insulated terminals of each cup of the potentiometer. Connect the insulation resistance test set to the terminal of the first cup and to some exposed conducting surface (shaft, housing, etc.) and apply the specified test voltage. Unless otherwise specified the test voltage shall be 500 VDC. Maintain the test voltage at this level for 5 to 0 seconds before initiating movement of the shaft through one full sweep of the total mechanical travel in a time interval of not less than 5 seconds nor more than 60 seconds. Monitor the indicated insulation resistance during this voltage application, the insulation resistance is the minimum value observed during the movement of the shaft. For ganged potentiometers, repeat the procedure for each cup applying the high voltage between the terminal of each cup and the exposed conducting surface of the potentiometer. Output Smoothness The spurious variations in the electrical output not present in the input. They are measured for specified travel increments over the theoretical electrical travel and expressed as a percentage of the total applied voltage. TEST PROCEDURE Mount the potentiometer in the constant-speed drive (4 RPM) and excite it with the power supply. Connect the wiper and the power common lead to the input of the filter and the output of the filter to the oscilloscope. When a load is specified for a conformity test, use that load for the output smoothness test. When no load is specified for the conformity test, apply a load equal to 00 times the nominal resistance value of the potentiometer under test between the wiper and the end (unless otherwise specified). The output smoothness is the largest excursion voltage occurring over one specified travel increment, divided by the total applied voltage. Unless otherwise specified, the travel increment is % of the theoretical electrical travel. Excursions occurring at the point of abrupt changes in input slope (start, end, and reversal) are not considered output smoothness faults. Power Rating The maximum power, in watts, that a potentiometer can dissipate across the entire resistive element under specified conditions while meeting specified operating performance requirements. Resolution A measure of the sensitivity to which the output of a potentiometer may be set. (Applicable to wirewound potentiometers only.) Theoretical resolution; the reciprocal of the number of turns of wire in the resistance winding in the actual electrical travel, expressed as a percentage. Travel resolution; the maximum value of shaft travel (in degrees for rotary devices) in one direction per incremental voltage stop in any specified portion of the resistance element. Voltage resolution; the maximum incremental change in output ratio with shaft travel in one direction in any specified portion of the resistance element. TEST PROCEDURE Consult factory. Specifications are subject to change without notice. 75