[TechAssist] Re: Diode testing
- From: Paul <dntwntv@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 27 Aug 2004 09:52:40 -0700 (PDT)
They are not noted in the service literature as any thing special. The only
thing that sets them apart is that they are fast recovery diodes. I have a
fluke and a beckman meter. They both check about the same. These two diodes are
doing some strange things that
I don't remember seeing before. One of them changes like a capacitor charging
Paul
Kevin <kevintv@xxxxxxx> wrote:
Could these 2 diodes be Schottky ones? With my Fluke 12 on diode
setting, Schottky diodes measure very low resistance one way, and the
other way the meter just blinks '0' and open.
Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Paul
Sent: Thursday, August 26, 2004 7:11 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Diode testing
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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Paul ,B
Central TV&Video
911W Grand Ave
Grover Beach Ca.
(805)481-8084
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