diode/continuity tester sa mga DMM...

[tikbalang]

ano ang mine-measure nito pag diode ang tinetest? reliable ba ito para makapag ID ng mga diodes?

[rdpzycho]

forward voltage. 'di siya masyadong reliable kung pagbabasehan kung exactly same 'yung diode dahil iba-iba ang characteristic ng diode kapag low current. though, pwede siyang basis kung may problem sa similar diode (or transistor) sa mga circuit.

[???]

Simple checking ng diode at transistor kung shorted in-circuit. Minsan nakakapagbigay kung anong collector or emitter pin using its forward voltage reading.

[bravokilo]

Well,actually continuity tester yan. However, since a DC voltage is used, magkakaroon talaga ng polarity. For example, if instead of the meer, we put an incandescent bulb. Then nakaseries ng 1.5V battery. We will have a crude continuity tester, di ba? kapag may contact yung tinetest, ilaw. Walang issue ang polarity. kahit baliktarin and probes, sindi pa rin. ow, if the part nder test is a diode, we will soon observe na hinde pala pwede baliktarin ang probes. so, we color the probe red where the positive line is and black for the other end. So, in testing a diode, we know we have to inject the plus towards the arrow(sa walang band ng diode). Yung black probe sa may band. Dapat sumindi. Kapag nireverse and probes, dapat hinde sumindi. Kung sumindi, shorted and diode. Kung hinde sumisindi either way, OPEN ang diode.

BK

[NORTH LUZON]

pag sa ordinary diode at gumalaw kabilaan ang metro mo sure sira na yan

mas magandang tanong sana kung papanu itetest ang mga high voltage diodes

[???]

Paano nga ba kagawad?

[bravokilo]

Well, diodes have PIV or peak inverse voltage. We cannot test that with an ordinary tester. We need a variable voltage source but at low current. Plus on the band side. At the PIV, tagos ang plus and we can read off the plus dun sa cathode. Yan ang principle ng Zener diodes di ba? may breakdown voltage.