Measuring Resistance - Digimaster DM-58 A Manual De Uso

C. Mea suring Resis tan ce
Warning – To a void d amages to the Me ter or to the de vic es und er t est, dis conne ct circuit
pow er and dis charg e all th e high-v oltage c apa citors before meas uring resi stanc e.
The r esista nc e ra ng es a re:
Mod el D M5 8A/: 2 00 Ω, 2k Ω, 2 0kΩ, 2 MΩ, 20 MΩ a nd 200 MΩ.
Mod el D M5 8B: 2 00Ω, 2k Ω, 2 0kΩ, 2 MΩ and 2 0MΩ.
7. Insert th e red test le ad int o the HzVΩ
into the C OM ter min al.
8. Set th e rotary switch to a n a ppro priate m eas ur em ent p ositi on i n Ω ran g e.
9. Con nect the test lea ds acr oss with th e o bj ect bein g me asu re d.
The meas ur ed v al ue sho ws on th e dis pl ay .
Note
The test le a ds can add 0.1 Ω to 0. 2 Ω of err or to th e slo w-r esista nce measur em ent. To o btai n accur ate
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rea di ngs in l ow-r esistanc e, short-circ uit the i nput te rmi n als before han d and r eco rd th e r eadi ng o btai ned
(call ed t his re ading as X). ( X) is the a dditi on al resista nce f rom the test le a d. Then use the equ atio n:
Measur ed resist anc e value (Y) – (X) = accurate rea dings of resistance.
If the inp ut term in al short-circuit read ing > 0.5 Ω , c heck th e test le a ds f or any loos eness or oth er ca use.
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For high resista nce ( >1 MΩ) , it is nor ma l taki ng s ev eral sec onds t o obt ain a sta ble r eadi ng; s el ect sh ort
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test lea ds f or stabl e a nd prec ise r ea di ngs.
When th e r esista nc e is h ig he r th an the maxi mu m ra nge or in o p en circ uit c onditi on, t he Meter d ispl ays
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"1".
When r esistance m eas urem ent has bee n com plet ed, d isco nn ect the co nn ectio n b etwe en the testing
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lea ds a nd th e circuit und er test.
black
(D M58 B) or VΩ (D M58 A/) t ermi nal and the bl ack test l ead
red
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