document number: 57057 revision 20-nov-01 www.vishay.com 78 model 302 vishay spectrol features servo and bushing mount ? ? to 50k ? 2?single turn wirewound precision potentiometer ordering information the model 302 can be ordered from this data sheet with a variety of alternate characteristics, as shown. for most rapid servic e on your order, please state: 302 2 1 xxx model mounting number of sections total resistance of each section 1 . bushing beginning with the section nearest the 2 . servo mounting end 3 . screw other characteristics will be standard as described on this data sheet. if special characteristics are required, such as: spec ial linearity tolerance, special resistance tolerance, extra taps, non-linear functions, etc., please state these on your order and allow add itional lead time for delivery. parameter standard special total resistance: 5 ? to 50k ? 85k tolerance 50 ? and above 3% 1% below 50 ? 5% 3% absolute minimum resistance linearity x total resistance or 0.5 ? whichever is greater end voltage linearity x total applied voltage for total resistance above 20 ? , 2.0% of total applied voltage for 20 ? and below linearity (independent) standard best practical 5 ? to 50 ? 1.0% 0.50% 50 ? to 200 ? 0.50% 0.35% 200 ? to 1k ? 0.25% 0.20% 1k to 10k 0.25% 0.15% 10k and above 0.25% 0.10% noise 100 ? enr rotation 350 2 power rating section 1: 4.0 watts 70 c ambient derated to zero at 125 c additional sections 75% of the rating of section 1 (3.0 watts at 70 c) insulations resistance 1000m ? minimum 500 vdc dielectric strength 1000v rms , 60hz taps (extra) 21 available as special, standard tolerance 1 phasing (ccw end points) additional sections phased to section 1 within 1 electrical specifications
www.vishay.com 79 model 302 vishay spectrol document number: 57057 revision 20-nov-01 dimensions in inches (millimeters) 2?single turn wirewound precision potentiometer 1 3 2 cw schematic parameter rotation 360 (continuous) bearing type servo & screw mount: ball bushing mount: sleeve ganging 6 sections maximum terminal alignment, added sections, within 10 of section 1 terminals torque (maximums) starting running 1 section 1.0 oz - in (72.00gm - cm) 0.5 oz - in (36.00gm - cm) bushing (1 section) 1.7 oz - in (122.42gm - cm) 1.0 oz - in (72.00gm - cm) each added section 0.6 oz - in (43.21gm - cm) 0.4 oz - in (28.80gm - cm) mechanical runouts (maximums) servo and screwing bushing shaft tir/in 0.002 in (0.05cm) 0.002 in (0.05cm) pilot dia tir 0.002 in (0.05cm) 0.002 in (0.05cm) lateral tir 0.003 in (0.08cm) 0.005 in (0.13cm) shaft end play 0.005 in (0.13cm) 0.005 in (0.13cm) shaft radial play 0.002 in (0.05cm) 0.003 in (0.08cm) moment of inertia 2.0gm - cm 2 per section maximum weight (maximums) single section: 4.0 oz (113.40gm) each additional section: 1.2 oz (34.02gm) mechanical specifications 0.800 (20.32) 0.010 0.625 (15.88) 0.062 (1.57) 0.031 2.000 (50.80) 0.015 0.7500 (19.05) + 0.0000 - 0.0005 0.2497 (6.34) + 0.0000 - 0.0003 mtg. face 0.312 min (7.92) 15 typ 1 2 3 1.200 r max (30.48) 8-32 unc - 2b 0.187 deep (4.75) 3 holes equally spaced 1.250 b.c (31.75) 1.140 r max (28.96) 0.005 45 5 0.705 (17.91) 0.010 0.875 (22.22) 0.031 0.375 (9.52) 0.015 3/8-32 unef 2a 2.000 (50.80) 0.015 0.4062 (10.32) + 0.0000 - 0.0010 0.2497 (6.34) + 0.0000 - 0.0003 mtg. face 0.062 (1.57) 0.239 min (6.07) 2.000 (50.80) 1.8750 (47.62) + 0.0000 - 0.0005 mtg. face 1.812 max (46.02) 2.000 (50.80) 0.015 0.062 (1.57) 0.093 (2.36) 0.831 (21.11) 0.010 0.625 (15.88) 0.031 0.073 min (1.85) 0.340 min (8.64) 0.2497 (6.34) + 0.0000 - 0.0003 1 1 1 add 0.500 (12.70) foe each additional section 0.002 tolerances: unless otherwise noted. decimals 0.005 angles 2 servo mount bushing mount screw mount
document number: 57057 revision 20-nov-01 www.vishay.com 80 model 302 vishay spectrol power rating chart (ratings for cup no. 1. additional cups 75% of values shown) ambient temperature in ( c) r ated power in (w atts) material specifications housing and lids aluminum, anodized shaft and clamp rings stainless steel, non-magnetic non-passivated terminals brass, plated for solderability bushing mount hardware lockwasher internal tooth: steel, nickel plated panel nut: brass, nickel plated environmental specifications vibration 15g thru 2000 hz shock 50g salt spray 96 hours rotational life 1 million shaft revolutions temperature range - 55 c to + 125 c humidity cycling: moisture resistance unit units shall be marked with spectrol name, model no and date code, and on each section, identification resistance, resistance tolerance, linearity and terminal identification marking maximum maximum current voltage wire resistance reso- ohms at 70 c across temp. values lution per ambient coil coef. ( ? ) (%) turn (ma ) (v) (ppm/ c) 5 0.320 0.016 893 4.48 800 10 0.200 0.020 633 6.32 800 20 0.165 0.033 447 8.95 800 50 0.148 0.074 283 14.1 800 100 0.151 0.151 200 20.0 20 200 0.126 0.252 141 28.4 20 500 0.115 0.573 89.4 44.7 20 1k 0.098 0.981 63.3 63.2 20 2k 0.085 1.70 44.7 89.5 20 5k 0.059 2.93 28.3 141 20 10k 0.051 5.16 20.0 200 20 20k 0.043 8.55 14.1 284 20 50k 0.032 15.80 8.94 447 20 resistance element data 20 40 60 80 100 120 140 160 0 2 4 6 8 2?single turn wirewound precision potentiometer special 150 c standard 125 c
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