2" (50.8 mm) single turn conductive plastic precision potentiometer model 308 vishay spectrol www.vishay.com for technical questions, contact: sfer@vishay.com document number: 57058 38 revision: 17-may-10 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 ? compliant to rohs directive 2002/95/ec electrical specifications parameter total resistance standard range 500 to 100 k to l e r a n c e 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 v dc 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 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 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 ordering information/description the model 308 can be ordered from this data sheet with a variety of alternate characteristics, as shown. for most rapid service on your order, please state: 308 b 1 20k bo1 model mounting number of sections total resistance of each section packaging b : bushing s: servo up to 6 beginning with the section nearest the mounting end box of 1 piece other characteristics will be standard as described on this data s heet. if special characteristics are required, such as: speci al linearity tolerance, special resistance tolerance, extra taps, non-linear functions, etc., please state t hese on your order and allow additional lea d time for delivery. sap part numbering guidelines 308 s 1 203 b01 model style gang number ohmic value gang n o 1packaging b : bushing s: servo from 1 up to 6 20k
model 308 2" (50.8 mm) single tu rn conductive plastic precision potentiometer vishay spectrol document number: 57058 for technical questions, contact: sfer@vishay.com www.vishay.com revision: 17-may-10 39 dimensions in inches (millimeters) 0. 8 31 (21.10) 0.010 0.625 (15. 88 ) 0.031 0.073 min. (1. 8 5) ? 2.000 (50. 8 0) ? 1. 8 750 (47.62) + 0.0000 - 0.0005 ? 0.2497 (6.34) + 0.0000 - 0.0003 0.062 (1.57) mtg. face ? 2.000 (50. 8 0) 0.015 ? 1. 8 12 max. (46.02) 0.093 (2.36) 0.340 min. ( 8 .64) 15 typ. 45 5 3 1 2 1.200 r max. (30.4 8 ) 1.140 r max. (2 8 .96) servo mount: 30 8 s bushing mount: 30 8 b ? 2.000 (50. 8 0) 0.015 ? 1.375 (34.92) 0.015 ? 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. 8 75 (22.22) 0.031 0.375 (9.52) 0.010 0.062 (1.57) ? 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 2 3 1 1 1 power rating chart (ratings for cup no. 1. additional cups 75 % of values shown) ambient temperature in c rated power in w 20 40 60 8 0 100 120 140 160 0 1 2 3 4 resistance element data resistance values ( ) maximum voltage applicable (v) 500 32 1k 45 2k 71 5k 100 10k 141 20k 224 50k 316 100k 350* * maximum voltage allowable
model 308 vishay spectrol 2" (50.8 mm) single tu rn conductive plastic precision potentiometer www.vishay.com for technical questions, contact: sfer@vishay.com document number: 57058 40 revision: 17-may-10 mechanical sp ecifications parameter rotation 360 (continuous) bearing type servo mount: bushing mount: ball bearing sleeve bearing ganging 6 sections maximum terminal alignment, added 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) marking unit identification units shall be marked with spectrol name, model no, and data code, and on each section, resistance, resistance tolerance, linearit y and terminal identification
document number: 91000 www.vishay.com revision: 18-jul-08 1 disclaimer legal disclaimer notice vishay all product specifications and data are subject to change without notice. vishay intertechnology, inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, ?vishay?), disclaim any and all liability fo r any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. vishay disclaims any and all li ability arising out of the use or application of any product describ ed herein or of any information provided herein to the maximum extent permit ted by law. the product specifications do not expand or otherwise modify vishay?s terms and conditions of purcha se, including but not limited to the warranty expressed therein, which apply to these products. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of vishay. the products shown herein are not designed for use in medi cal, life-saving, or life-sustaining applications unless otherwise expressly indicated. customers using or selling vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify vishay for any damages arising or resulting from such use or sale. please contact authorized vishay personnel to obtain written terms and conditions regarding products designed for such applications. product names and markings noted herein may be trademarks of their respective owners.
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