Meter check of a transistor

Wendy

Joined Mar 24, 2008
23,801
What kind of meters are you using? I've never tried with a DVM, but VOMs work really well.

Here I'm assuming the use of a multimeter with only a single continuity range (resistance) function to check the PN junctions. Some multimeters are equipped with two separate continuity check functions: resistance and “diode check,” each with its own purpose. If your meter has a designated “diode check” function, use that rather than the “resistance” range, and the meter will display the actual forward voltage of the PN junction and not just whether or not it conducts current.
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After reading the entire article this will work. Care to pick up the discussion in the Electronics Chat Forum?
 

Wendy

Joined Mar 24, 2008
23,801
Related, but I suspect the OP hasn't read it.

To the OP:

A suggestion, and likely my last word on this subject in this forum, try it on a known transistor to get a feel for the readings and how it works.
 

AlexR

Joined Jan 16, 2008
732
The OP is correct. The procedure will not work with an a if you are using a digital meter and it is set to Ohms. The meter MUST be set to "Diode test" for it to work.

The typical digital meter put out around 0.2Volt on the Ohms range which is not enough to forward bias the PN junction.
 
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