[TechAssist] Re: Diode testing
- From: Edward Gaidies <teltek3@xxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 26 Aug 2004 22:57:35 -0400
Paul;
Most digital meters have a diode testing position.
I use a Beckman 300. I don't know what the expected reading would be,
but after years of using the same meter, you get a feel for it.
Probably the same for ESR meters. May not always shoe what's on the
scale...but it's just a feeling.
-Ed-
Ed Gaidies
Tel-Tek Electronics
Ontario-Canada
teltek3@xxxxxxxxxxxx
On 26-Aug-04, at 10:10 PM, Paul wrote:
> When checking diodes for leakage, what range on the ohm meter do you
> use and is there an acceptable amount? Sounds like electronics 101
> but I have a couple of diodes that are flat case diodes mounted on a
> heat sink. They read 160 front to back on the diode check. No reading
> back to front. However they read 20k on the ohms scale. If heated this
> reading goes down to 2 or 3 K. I normally set my meter on 100k ohm for
> leakage. I thought they must be leaking. But wondered if there are
> some big diodes that test this way normally? Someone said that 10X the
> back to front was normal. These are in the secondary of a SMPS + & --
> 25v to convergence amps.
>
> Paul
>
> Paul ,B
> Central TV&Video
> 911W Grand Ave
> Grover Beach Ca.
> (805)481-8084
>
>
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