308 VISHAY

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www.vishay.com Vishay Spectrol Revision: 27-Mar-15 1 Document Number: 57058 For technical questions, contact: sferprecisionpot@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 2" (50.8 mm) Single Turn Conductive Plastic Precision Potentiometer

FEATURES

  • Bushing mount and servo mount types available
  • Virtually infinite resolution
  • Up to 6 sections available
  • Rotational life exceeds 20 million shaft revolutions
  • Co-molded track and multi-finger wiper provide low noise signal
  • Large ohmic value range: 500  to 100 k
  • Material categorization: fo r definitions of compliance please see www.vishay.com/doc?99912 QUICK REFERENCE DATA Sensor type ROTATIONAL , conductive plastic Output type Output by turrets Market appliance Professional Dimensions 2" (50.8 mm) ELECTRICAL SPECIFICATIONS PARAMETER Total resistance standard range 500  to 100 k Tolerance STANDARD ± 10 % SPECIAL ± 5 % Linearity (independent) STANDARD ± 0.25 % SPECIAL ± 0.05 % Electrical angle 350° ± 2° Power rating Section 1 Additional sections

2.0 W at 70 °C ambient derated to zero at 125 °C (400 V

DC maximum) 75 % of the rating of section 1 Output smoothness 0.1 % maximum Insulation resistance 1000 M  minimum, 500 VDC Dielectric strength 1000 V RMS, 60 Hz Taps (extra) Extra taps available as special Phasing Points at which output ratio is 0.5 aligned ± 1° (ref. to section 1) Temperature coefficient of resistance ± 600 ppm/°C maximum

ORDERING INFORMATION

MODEL STYLE GANGS OHMIC VALUE GANGS No 1 OHMIC VALUE GANGS No 2 SPECIAL REQUEST

308 B : bushing

S: servo 470 = 47  222 = 2.200  103 = 10 k For ohmic value range see electrical specification 470 = 47  222 = 2.200  103 = 10 k For ohmic value range see electrical specification xxxx PART NUMBER DESCRIPTION (for information only) 308- 1 2 103 203 xxxx MODEL STYLE GANGS OHMIC VALUE GANGS No 1 OHMIC VALUE GANGS No 2 SPECIAL B: 1 S: 2

www.vishay.com Vishay Spectrol Revision: 27-Mar-15 2 Document Number: 57058 For technical questions, contact: sferprecisionpot@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 DIMENSIONS in inches (millimeters) MECHANICAL SPECIFICATIONS PARAMETER Rotation 360° (continuous) Bearing type Servo mount: Bushing mount: Ball bearing Sleeve bearing Ganging 6 sections maximum. Terminal alignment, a dded sections, within ± 10° of section 1 terminals Torque (maximums) Mounting Servo, 1 section Bushing, 1 section Each additional section STARTING 1.0 oz. - in (72.00 g - cm) 1.7 oz. - in (122.40 g - cm) 0.6 oz. - in (43.20 g - cm) RUNNING 0.5 oz. - in (36.00 g - cm) 1.0 oz. - in (72.00 g - cm) 0.4 oz. - in (28.80 g - cm) Runouts (maximums) Shaft (TIR/in) Pilot dia. (TIR) Lateral (TIR) Shaft end Play Shaft Radial play SERVO 0.002" (0.05 cm) 0.002" (0.05 cm) 0.003" (0.08 cm) 0.005" (0.13 cm) 0.002" (0.05 cm) BUSHING 0.002" (0.05 cm) 0.002" (0.05 cm) 0.005" (0.13 cm) 0.005" (0.13 cm) 0.003" (0.08 cm) Moment of inertia 2.0 g - cm 2 per section maximum Weight Single section Each additional section 4.0 oz. (127.57 g) 1.2 oz. (34.02 g) 0.831 (21.10) ± 0.010 0.625 (15.88) ± 0.031 0.073 MIN. (1.85) Ø 2.000 (50.80) Ø 1.8750 (47.62) + 0.0000 - 0.0005 Ø 0.2497 (6.34) + 0.0000 - 0.0003 0.062 (1.57)MTG. FACE Ø 2.000 (50.80) ± 0.015 Ø 1.812 MAX. (46.02) 0.093 (2.36) 0.340 MIN. (8.64) 15° TYP. 45° ± 5° 3 1.200 R MAX. (30.48) 1.140 R MAX. (28.96) SERVO MOUNT: 308S/308-2 BUSHING MOUNT: 308B/308-1 Ø 2.000 (50.80) ± 0.015 Ø 1.375 (34.92) ± 0.015 Ø 0.4062 (10.32) + 0.0000 - 0.0010 3/8 - 32 UNEF - 2A MTG. FACE 0.010 (0.25) 0.239 MIN. (6.07) 0.705 (17.91) ± 0.015 0.875 (22.22) ± 0.031 0.375 (9.52) ± 0.010 0.062 (1.57) Ø 0.2497 (6.34) + 0.0000 - 0.0003 1 ADD 0.500 ± 0.002 (12.70) FOR EACH ADDITIONAL SECTION TOLERANCES: UNLESS OTHERWISE NOTED. DECIMALS ± 0.005 ANGLES ± 2° CW SCHEMATIC

www.vishay.com Vishay Spectrol Revision: 27-Mar-15 3 Document Number: 57058 For technical questions, contact: sferprecisionpot@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 POWER RATING CHART (Ratings for cup No. 1. Additi onal cups 75 % of values shown) Note

  • Nothing stated herein shall be construed as a guarantee of quality or durability. Note (1) Maximum voltage allowable MATERIAL SPECIFICATIONS Housing and lids Aluminum, anodized Shaft and clamp rings Stainless steel, non-magnetic non-passivated Terminals Brass, gold plated for solderability Bushing mount hardware Lockwasher internal tooth: Panel nut: Steel, nickel plated Brass, nickel plated MARKING Unit identification Units shall be marked with Spectrol name, model no, and data code, and on each section, resistance, resistance tolerance, linearity and terminal identification. Example of a marking for a standard part: 308-21503AMBIENT TEMPERATURE IN °C RATED POWER IN W 20 40 60 80 100 120 140 160 ENVIRONMENTAL SPECIFICATIONS Vibration 15 g thru 2000 Hz Shock 50 g Salt spray 96 h Rotational life Servo: 20 million shaft revolutions Bushing: 5 million shaft revolutions Load life 900 h Temperature range -55 °C to +125 °C RESISITANCE ELEMENT DATA RESISTANCE VALUES () MAXIMUM VOLTAGE APPLICABLE (V) 500 32 1K 45 2K 71 5K 100 10K 141 20K 224 50K 316 100K 350 (1)

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