hfe on multimeters

pdul · 21st February 2010, 07:32 PM

Anybody here who knows if it is possible to buy some kind of test lead, that
will fit into the little round outlet for hfe measurement on typical cheap
multimeters?

mjf · 21st February 2010, 08:30 PM

hello.
once i cut off the legs of a dead transistor and soldered it onto a piece of cable...........
greets

pdul · 22nd February 2010, 04:47 PM

Thanks for the reply.
I was just thinking that since that little very unpractical outlet has been around for god knows how long, Maybe somebody out there could have invented some kind of commercial design/ solution for the connection.
I will probably dedicate an instrument to hfe measurement, and solder the wires directly in the instrument and make a little hole in the side of the cabinet

AndrewT · 22nd February 2010, 04:56 PM

the hFE measurement built into DMMs is not worth much.
Most of them feed a constant fixed base current and measure the collector current.
You have no control over the collector current, nor the power dissipated, nor the temperature. Only good for a rough grouping.

Make up a little jig and do your own hFE measurement.

pdul · 22nd February 2010, 05:33 PM

Rough grouping!
Good exspression for what i need here. Right now it is a question hfe 400-500 or 100-200
etc. or as close as possible.
The golden jig that will make the fat lady sing, will be later on

21st February 2010, 07:32 PM	#1
pdul diyAudio Member Join Date: Jan 2009	hfe on multimeters Anybody here who knows if it is possible to buy some kind of test lead, that will fit into the little round outlet for hfe measurement on typical cheap multimeters?

22nd February 2010, 04:56 PM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	the hFE measurement built into DMMs is not worth much. Most of them feed a constant fixed base current and measure the collector current. You have no control over the collector current, nor the power dissipated, nor the temperature. Only good for a rough grouping. Make up a little jig and do your own hFE measurement. __________________ regards Andrew T.

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21st February 2010, 08:30 PM	#2
mjf diyAudio Member Join Date: Jan 2009 Location: upper austria/near linz	hello. once i cut off the legs of a dead transistor and soldered it onto a piece of cable........... greets

22nd February 2010, 04:47 PM	#3
pdul diyAudio Member Join Date: Jan 2009	Thanks for the reply. I was just thinking that since that little very unpractical outlet has been around for god knows how long, Maybe somebody out there could have invented some kind of commercial design/ solution for the connection. I will probably dedicate an instrument to hfe measurement, and solder the wires directly in the instrument and make a little hole in the side of the cabinet

22nd February 2010, 05:33 PM	#5
pdul diyAudio Member Join Date: Jan 2009	Rough grouping! Good exspression for what i need here. Right now it is a question hfe 400-500 or 100-200 etc. or as close as possible. The golden jig that will make the fat lady sing, will be later on

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