* contact factory for values below 0r005 ohms open air sense resistors oar series 1, 3 and 5 watts ?% or ?% tolerance resistance wire tcr ?0 ppm/? resistance values down to 0r005 ohms dimensions (mm) type a b c e f oar-1 11.43 +1.020/-0.508 5.08 ?.54 3.18 ?.762 1.65 +0.254/-0.127 1.02 ?.051 oar-3 15.24 +1.020/-0.50 25.4 max. 3.18 ?.762 1.65 +0.254/0.127 1.02 ?.051 oar-5 20.32 +1.020/-0.50 25.4 max. 3.18 ?.762 1.65 +0.254/-0.127 1.02 ?.051 general note welwyn components reserves the right to make changes in product specification without notice or liability. all information is subject to welwyn s own data and is considered accurate at time of going to print. ?welwyn components limited ?bedlington, northumberland ne22 7aa, uk telephone: +44 (0) 1670 822181 ?facsimile: +44 (0) 1670 829465 ?email: info@welwyn-tt.com ?website: www.welwyn-tt.com 101 oar-1 oar-3 oar-5 power rating at 85? watts 1 3 5 resistance range ohms 0r005* to 0.10 0r005 to 0.10 0r005 to 0.05 electrical data physical data issue d ?08.04 a subsidiary of tt electronics plc welwyn components b a c f e on lower ranges stand-off may be eliminated note: contact factory for: 1. variations of ??dimension 2. different lead diameter test point (kelvin connection) oar_d.qxd 8/9/04 4:15 pm page 1
performance dat a open ai r sense resistor s oar serie s ? w elwyn components limited bedlington, northumberland ne22 7aa, uk t elephone: +44 (0 ) 1670 822181 facsimile: +44 (0 ) 1670 829465 email: info@welwyn-tt.com w ebsite: ww w .welwyn-tt.com 102 issue d 08.04 w elwyn components maximum change load life: 1000 hrs at 25c ? 1 % r moistu r e no load 100 hrs ? 1 % r t emperatu r e cycle at -40c & +125c (1000 cyc): ? 1 % r featu r es ? w elded construction ? flamep r oof ? inductance less than 10 nanohenries ? solderable copper leads applications ? cur r ent sensing ? feedback ? low inductance ? surge and pulse oar-5 resistanc e 0.00 5 0.01 0 0.01 5 0.02 0 0.025 heigh t 15.24 0 19.30 4 19.30 4 22.86 0 22.860 oar-3 resistanc e 0.00 5 0.01 0 0.01 5 0.02 0 0.02 5 0.03 0 0.04 0 0.05 0 0.07 0 0.08 0 0.10 heigh t 16.00 2 16.51 0 16.51 0 17.01 8 22.09 8 22.86 0 16.00 2 18.28 8 22.86 0 21.59 0 22.860 oar-1 resistanc e 0.005 - 0.100 heigh t 5.080 height standa r d s all resistances a r e in ohms. all t olerances a r e 2.54. dimensions (mm) o r dering p r ocedu r e oar_d.qxd 8/9/04 4:15 pm page 2 e x a m p l e : o ar 3 a t 1 0 m i ll i o h m s and 5% t o l e r an c e i n bu l k pa ck - o a r 3 ? r 0 1 j i t y p e v a l ue ( u s e i e c62 c ode ) t o l e r an c e ( u s e i e c62 c ode ) f 1 % j 5 % p a ck i ng i b u l k s t and a r d
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