Products > Test Equipment
Measuring hfe of a transistor by multimeter ?
(1/4) > >>
Nhan95:
Some cheap multimeters have a transistor socket to measure hfe. But some new multimeter, the transistor socket is not available. So Is there any way to measure the hfe by any multimeters that do not have transistor socket on them ?
tautech:
Yes I've noticed this too, and is the reason why I still have a Vichy 99.
I have found faulty transistors with it, matched pairs, and selected subsitutes to fall within a HFE range as listed in datasheets.
IMO exact measurement of gain is not so important, but comparison and confirmation of a working or failed device is when it becomes very useful.
rdl:
Get one of those cheap component testers from eBay. It's one of the most useful items I have. price starts around $20 or less, though I'd recommend spending a bit more and get one that comes in some kind of case. Just search on eBay for transistor esr tester. There's a many pages long thread about them here somewhere.

edit: here it is, was only a few threads away

https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/
bson:
I think mainly because getting a quality (usable, if you depend on it) measurement of some property of a transistor is a bit more involved.  The most obvious problem is that hfe changes with temperature - as the DUT warms up hfe will increase.  Temperature changes with Ic... so there's no single hfe to measure.  :(

The diode tester will tell you if a BJT good...  An NPN BJT can be checked as two diodes with a common anode (KAK).  A PNP is the opposite.
Electro Fan:
another device worth considering (not as cost-effective as a built in DMM feature, but handy if you are into transistors):



They also have another model that does more via a PC interface.
Navigation
Message Index
Next page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod