Measuring Diodes - Digimaster DM-58 A Manual De Uso

D. Mea suring Diode s
Warning – To a void da mage to th e Meter or to th e equip me nt under t est, disconnect circ uit
pow er and dis charg e all high- volta ge c ap acitors before m ea suring diode s.
To avoid h arms to y ou, plea se do not atte mp t to input vol tag es high er than 60V DC or 3 0 V rms AC.
Use the di od e test to c heck di od es, tra nsisto rs, an d ot her semicond ucto r d evices. The diod e test se nds a
curr ent th ro ugh the semic on duct or j uncti on, and then me asu res t he v olta ge dr op acr oss th e j uncti on. A g ood
silico n ju nctio n d rops bet we en 0.5 V a nd 0.8 V.
To test out a di od e o ut of a circuit, co nn ect the Meter as f ollo ws:
Insert t he re d test le ad int o th e HzV Ω
7.
into the C OM ter min al.
8. Set th e rotary switch to
9. For f or ward voltage dr o p re adi n gs on any semicon duct or comp on ent, place th e re d test le ad on the
comp one nt's ano de and place t he black test l ead on the c ompone nt's cat hode.
The meas ur ed v al ue sho ws on th e dis pl ay .
Note
In a circ uit, a go od di ode s h oul d sti ll pr oduce a f or ward v olt age drop re a din g of 0.5 V to 0.8V: h o wev er,
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the rev erse v olta ge d ro p re adin g can v ary de pe ndin g on th e resist ance of othe r pat h way s b etween the
pro b e tips.
Con nect the test le ads to the pr oper termi na ls as sai d a bove to avoid err or display . The LCD will d ispl ay
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"1" indicati n g o pen-circu it f or wrong co nnectio n. Th e unit of dio de is V olt ( V), dis play in g th e p ositiv e-
con necti on v olta ge-d ro p value.
The op en-circuit voltag e is ar oun d 3 V.
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When di ode testing has be en co mp lete d, discon nect th e con nection bet wee n t he testing le ads and the
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circuit u n der test.
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(D M58 B) or VΩ
.
black
red
(D M58 A/) te rmi na l a nd the black test l ead