Model 308 www.vishay.com Vishay Spectrol 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: for 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 500 to 100 k Total resistance standard range 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 VDC maximum) 75 % of the rating of section 1 Output smoothness 0.1 % maximum Insulation resistance 1000 M minimum, 500 VDC Dielectric strength 1000 VRMS, 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 3 0 8 S 1 2 0 MODEL STYLE GANGS 308 B: bushing S: servo 1 2 3 4 5 6 3 2 0 OHMIC VALUE GANGS No 1 470 = 47 222 = 2.200 103 = 10 k For ohmic value range see electrical specification 3 OHMIC VALUE GANGS No 2 470 = 47 222 = 2.200 103 = 10 k For ohmic value range see electrical specification SPECIAL REQUEST 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 Revision: 27-Mar-15 Document Number: 57058 1 For technical questions, contact: [email protected] 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 Model 308 www.vishay.com Vishay Spectrol DIMENSIONS in inches (millimeters) SERVO MOUNT: 308S/308-2 ± 0.010 ± 0.031 0.831 (21.10) 1 0.625 (15.88) 0.340 MIN. (8.64) 15° TYP. 3 1 2 ± 5° 45° 0.073 MIN. (1.85) 0.093 (2.36) 1.200 R MAX. (30.48) + 0.0000 ± 0.015 Ø 1.8750 - 0.0005 (47.62) Ø 2.000 (50.80) Ø 1.812 MAX. (46.02) Ø 2.000 (50.80) 0.062 (1.57) MTG. FACE + 0.0000 Ø 0.2497 - 0.0003 (6.34) 1.140 R MAX. (28.96) BUSHING MOUNT: 308B/308-1 ± 0.015 1 ± 0.031 0.875 (22.22) 0.705 (17.91) ± 0.010 0.375 (9.52) 0.239 MIN. (6.07) Ø 0.2497 (6.34) + 0.0000 - 0.0003 0.062 (1.57) + 0.0000 - 0.0010 Ø 0.4062 (10.32) 2 ± 0.015 Ø 2.000 (50.80) CW 3 1 SCHEMATIC 1 ± 0.015 Ø 1.375 (34.92) 0.010 (0.25) 3/ 8 - 32 UNEF - 2A MTG. FACE TOLERANCES: UNLESS OTHERWISE NOTED. DECIMALS ± 0.005 ANGLES ± 2° ADD 0.500 ± 0.002 (12.70) FOR EACH ADDITIONAL SECTION MECHANICAL SPECIFICATIONS PARAMETER Rotation 360° (continuous) Bearing type Servo mount: Bushing mount: Ganging Torque (maximums) Mounting Servo, 1 section Bushing, 1 section Each additional section Runouts (maximums) Shaft (TIR/in) Pilot dia. (TIR) Lateral (TIR) Shaft end Play Shaft Radial play Moment of inertia Weight Single section Each additional section Revision: 27-Mar-15 Ball bearing Sleeve bearing 6 sections maximum. Terminal alignment, added sections, within ± 10° of section 1 terminals 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) 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) 2.0 g - cm2 per section maximum 4.0 oz. (127.57 g) 1.2 oz. (34.02 g) Document Number: 57058 2 For technical questions, contact: [email protected] 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 Model 308 www.vishay.com Vishay Spectrol MATERIAL SPECIFICATIONS ENVIRONMENTAL SPECIFICATIONS Housing and lids Vibration Aluminum, anodized Stainless steel, non-magnetic non-passivated Shaft and clamp rings Terminals Brass, gold plated for solderability Bushing mount hardware Lockwasher internal tooth: Panel nut: Steel, nickel plated Brass, nickel plated MARKING 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: 308-21503 Unit identification POWER RATING CHART RATED POWER IN W (Ratings for cup No. 1. Additional cups 75 % of values shown) 4 3 2 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 Note • Nothing stated herein shall be construed as a guarantee of quality or durability. RESISITANCE ELEMENT DATA RESISTANCE VALUES () MAXIMUM VOLTAGE APPLICABLE (V) 500 1K 2K 5K 10K 20K 50K 100K 32 45 71 100 141 224 316 350 (1) Note (1) Maximum voltage allowable 1 0 20 40 60 80 100 120 140 160 AMBIENT TEMPERATURE IN °C Revision: 27-Mar-15 Document Number: 57058 3 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. 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