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Re: Checking M.O. diodes

Original poster: "David Sharpe by way of Terry Fritz <twftesla-at-uswest-dot-net>" <sccr4us-at-erols-dot-com>


Use a low voltage adjustable lab supply (~0-16VDC), set constant
current limit at about 50mA (low range).  Wire diode + to - in forward
conduction direction and adjust voltage upward.  You'll need 12-14VDC
depending on number of series diodes to initiate forward conduction.
Reverse connection and NO detectable current flow should be seen.
A better test would be a high voltage curve tracer, but this test will at least
tell you if the diode is properly forward conducting and blocking in
reverse direction, and is a simple test no requiring HV to perform.


Dave Sharpe, TCBOR
Chesterfield, VA USA

Tesla list wrote:

> Original poster: "J. B. Weazle McCreath by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <weazle-at-hurontel.on.ca>
> Hello coilers,
> Anyone have a proven method for checking microwave oven diodes?
> My VOM, even on its highest ohms scale, won't show continuity
> in one direction as it does on "ordinary" (1N4007) type diodes.
> I tried measuring a known good diode, but no luck there either.
> 73, Weazle, VE3EAR/VE3WZL
> Listening: 147.030+ and 442.075+
> E-mail:    weazle-at-hurontel.on.ca
>            or ve3ear-at-rac.ca
> Web site:  www.hurontel.on.ca/~weazle