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Maynard A. Philbrook Jr.

In article ,
says...

"Phil Allison" wrote in message
...

"Gareth Magennis"
"Phil Allison"

I recently bought some TIP35C transistors from Farnell UK. Just before
I fitted one to an amplifier I thought I'd just check the pinouts.
Good job I did because instead of BCE they measured BEC.

** That is just not possible.

The middle leg is always the collector and metal tab used for
heatsinking.

FFS - get an ohmmeter and verify that simple fact.

Seems your dopey microprocessor ( ie software) based POS has gone ape
and confused Collector with Emitter.

I did suspect my dopey checker, but even with a fresh battery it ALWAYS
reads EXACTLY the same,

** ROTFL - since when is THAT any reason to trust it ?????

" It must be right cos it always tells the SAME lie "

Wot an idiot you are.

which is: 3 of them measure BEC with an Hfe of 5, the other one BCE with
an Hfe of 20.

** No fooling.

BJTs have very low Hfes if C and E are reversed.

Like 2 or 3 instead of 100 or 200.

They *also* show very low readings if the meter is no ****ing good.

See how that might be confusing ???

you need a real full range tester..
I have an old B&K that has test currents to select from and you need
to use the upper scale to properly test large units.

Bigger units have higher saturation voltage, higher forward Vbe voltage
and requires more Ibe just to get out of the hole..

In otherwords, you need to subject it to higher currents.

There are a variety of power BJTs that have much different saturations
on the Vce(sat) verses the Vf(be) ect.

If you have one of those auto sensing units, it'll fail!

Jamie

Jamie