My new multimeter, with capacitance / transistor tester relevant question.

finkfloyd · February 17, 2006, 12:09:16 PM

Hi bought one of these, as it looked a bargain from here:
http://cgi.ebay.co.uk/Digital-multimeter-capacitance-meter-Excellent_W0QQitemZ7589248662QQcategoryZ58277QQrdZ1QQcmdZViewItem

But the question is, on the transistor socket, it only has markings "EBCE" for each PNP & NPN, How would I measure a transistor with markings DSG?

Thanks

H.Manback · February 17, 2006, 12:15:46 PM

Well, as far as I know, the 'transistor tester' of a multimeter only works with bipolar transistors and maybe darlington and the like ('regular' transistors). What you are talking about with DSG pins, are Field Effect Transistors (FETs). I don't think that will work in a multimeter tester actually.

flibbergibbin · February 17, 2006, 12:18:41 PM

I think this should clear it up but I could be mistaken. Anyway, hope this helps.

http://www.st-andrews.ac.uk/~jcgl/Scots_Guide/info/comp/active/jfet/jfet.htm

flibbergibbin · February 17, 2006, 12:25:33 PM

I thought that I should clarify. The last sentence says "In each case the source puts fresh charges into the channel while the drain removes them at the other end. " So with that in mind I imagine you associate the source as the collector, the gate as the base, and the drain as the emitter allowing you to get your measurements accordingly. I might have misunderstood your question and if I did still this might be of use to someone.

finkfloyd · February 17, 2006, 01:37:40 PM

Hi, thanks for the info, I do not think that method works, as how would we know whether a fet was to go into the pnp or npn socket..

How do people measure FET's then?

StickMan · February 17, 2006, 01:46:40 PM

FETs are either n-channel or p-channel, which are roughly equivalent to NPN and PNP in terms of current flow. Look up the data sheets on www.digchip.com to find out what a particular FET is. Also, that's the best way to find out which lead is which, too.

flibbergibbin · February 17, 2006, 02:02:35 PM

another place to check pinouts as well as p-channel or n-channel.

http://www.nteinc.com/search.html

finkfloyd · February 17, 2006, 02:36:28 PM

Hi, thanks for the help

I get it now, does 150 - 215's sound about right for bunch of j201 fets?

Paul Perry (Frostwave) · February 18, 2006, 05:58:09 AM

http://www.4qd.co.uk/serv/mostest.html
tells you how to test (or at least check) fets.
A 'transistor' tester is for your 'ordinary' transistors; it's not a fet tester!

News:

My new multimeter, with capacitance / transistor tester relevant question.