diode test

Uwe Zimmermann

• January 14, 2019 19:45

From a normal multimeter I am used to get the value of the forward voltage drop when testing a diode. However, Pokit only seems to switch between ",000" for infinity compliance and "1,000" in forward direction. The same "1,000" also shows when just shorting the probe leads.

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  Ingo Stiegler

  • January 16, 2019 21:34

  Hello Uwe,
  That's the same with my two Pokits.
  I think that is still a bug (not a feature).
  Hope this is also improved with an update.
  greetings
  Ingo

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  TeraWales

  • December 17, 2021 17:49
  • Edited

  Hi....I measured a red LED with my 87V and I got 1.830V.
  I added another meter in series to measure the current and I read 0.98mA so I thought ok, the 87V establishes enough voltage to force 1mA in the diode and returns that value.Then I tested a second LED (white) and here what I got: 2.667V 0.85mA
  so my previous hypothesis is wrong.Moreover I tried the same LEDs with another meter, now using the 87V as an ammeter.
  Here the measurements:
  red LED 1.805V 0.67mA
  white LED 2.580V 0.31mA

  Make sure to consider the losses of components also. Many pcb assembly don't contain the good material and always cause a huge loss of signal. 

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