To test HV diodes, you can do two independent tests with different
setups. Check forward drop, conduction mode, with a normal 24-48 VDC
power supply, and a series resistor to limit I. You might assume
10-15 volt drop on each diode module, then 0.5 Amp or less max
current. I would limit it to a few dozen mA at most. Calculate the
series R to provide this current limit across the diode. If you get
current, it is probably good. If an ohmmeter shows fwd current, then
it is shorted completely.
In the reverse (PRV) mode, you need a high potter or megger as
someone stated. However, normally diodes don't just start to break
down early, they either are already toasted or they hold off the
voltage. Or some voltage.....
K5PRO
John
>would like to use this multi-meter to tell me if the diodes are
>intact and would also
>like to observe the voltage characteristics when this project is
>under load. I don't
>have a high voltage probe & am thinking that I might be able to get
>a decent reading
>if I use a resistor in series with the probe.
>
>Might someone have a suggestion of what I can do from here to accomplish this?
>Gary
>KA1J
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