Measuring Resistance - Digimaster DM38A Manual De Empleo

E. Me asuring R esi st anc e
Warning – To avoid da mages to the Meter or to th e devic es under t est, dis conn ec t circuit pow er and
disch arge all the high- volta ge c ap acitor s before m ea suring resi st anc e.
To measu re r esist anc e, conn ect the Meter as f ollo ws:
7. Insert th e red test lea d into t he VΩ te rmina l an d th e bl ack test le ad i nto the CO M te rmi nal.
8. Set the rota ry switch to an ap prop riat e me as ureme nt p osition in Ω ran ge.
9. Con nect the test le ads acr oss with th e obj ect bein g me asu red.
The m eas ur e valu e sh ows on the disp lay .
Note
The t est leads c an a dd 0.1Ω to 0.3Ω of error t o th e resista nce me asur em ent. To o btai n precision r eadi ngs in l o w-
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resistanc e, that is th e ran ge of 20 0Ω, short-circuit th e re d an d bl ack test l eads bef ore hand and rec ord t he readi ng
obta ined (call ed this r ea di ng as X). Th en use t he e quati on:
Meas ur ed resist anc e valu e (Y ) – ( X) = pr ecisi on re adi ngs of resistance.
For h igh res istanc e ( >1MΩ), it is norm al taki ng s everal s econds to obt ain a stable r ea di ng.
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When th ere is n o in put, f or example in op en ci rcu it con diti on, the Met er d ispl ay s "1".
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When r esist anc e meas ur eme nt h as be en c ompleted, disco nnect th e co nnectio n bet wee n th e testi ng l ea ds a nd
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the circ uit u nder test.
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(figure 5)
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