www.vishay.com for technical questions, contact: ww2bresistors@vishay.com document number: 30160 42 revision: 02-jul-10 WSMS2908 vishay dale power metal strip ? meter shunt resistor, very low value (down to 0.0001 ) features ? high power to resistor size ratio ? 5-terminal connection design ? use for single or multi-phase energy meters ? proprietary processing technique produces extremely low resistance values ? all welded construction ? very low inductance (< 5 nh) ? low thermal emf (< 3 v/c) ? compliant to rohs directive 2002/95/ec note (1) other values may be available, contact factory standard electrical specifications global model size power rating p 70 c w tolerance % resistance value range resistance values currently available (1) weight (typical) g/1000 pieces WSMS2908 2908 3.0 5.0 50 to 1000 100, 250, 300, 430, 500 2100 technical specifications parameter unit resis tor characteristics temperature coefficient ppm/c 500 for 100 , 225 for 250 , 175 for 300 , 430 , and 500 operating temperature range c - 65 to + 170 maximum current rating a ( p / r ) 1/2 global part number information global part numbering: WSMS2908l2500jk (WSMS2908, 0.00025 , 5 %) global model resistance value tolerance code packaging code special WSMS2908 l = m l1000 = 0.00010 l2500 = 0.00025 l3000 = 0.00030 l4300 = 0.00043 l5000 = 0.00050 j = 5.0 % k = bulk pack e = tape and reel (dash number) (up to 2 digits) from 1 to 99 as applicable ** please see document vishay material category policy: www.vishay. com/doc?99902 w s m s 2 9 0 8 l 2 5 0 0 j k
document number: 30160 for tec hnical questions, contact: ww2bresistors@vishay.com www.vishay.com revision: 02-jul-10 43 WSMS2908 power metal strip ? meter shunt resistor, very low value (down to 0.0001 ) vishay dale dimensions in inches (millimeters) derating 1.142 (29.0) 0.010 calibration notch terminal thickness 0.040 (1.0) all values 0.787 (20.0) ? 0.165 (? 4.2) 2 places 90 0.2 0.110 (2.8) 0.142 (3.6) 0.157 (4.0) 0.059 (1.5) 0.453 (11.5) 0.118 (3.0) 0.315 (8.0) 0.157 (4.0) 70 120 100 80 60 40 20 0 175 150 125 100 75 50 25 0 - 25 - 50 - 65 ambient temperature in c rated power in % tolerances on decimals xxx 0.005 resistance value ( ) resistor element thickness (inches) element length element material 100 0.040 0.080 mn-cu 250 0.059 0.276 mn-cu 300 0.051 0.276 mn-cu 430 0.038 0.315 mn-cu 500 0.033 0.315 mn-cu performance test conditions of test test limits thermal shock - 55 c to + 150 c, 1000 cycles, 15 min at each extreme 0.5 % r short time overload 5 x ra ted power for 5 s 0.5 % r low temperature operation - 65 c for 45 min 0.5 % r high temperature exposure 1000 h at + 170 c 1.0 % r bias humidity + 85 c, 85 % rh, 10 % bias, 1000 h 0.5 % r mechanical shock 100 g s for 6 ms, 5 pulses 0.5 % r vibration frequency varied 10 hz to 2000 hz in 1 min, 3 directions, 12 h 0.5 % r load life 1000 h at + 70 c, 1.5 h on, 0.5 h off 1.0 % r moisture resistance mil-std-202, method 106, 0 % power, 7b not required 0.5 % r
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.
|
