Re: Checking M.O. diodes

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Herwig Roscher by way of Terry Fritz <twftesla-at-uswest-dot-net>" <herwig.roscher-at-gmx.de>


J. B. Weazle McCreath wrote to the list:

> Anyone have a proven method for checking microwave oven 
diodes?

Weazle,

According to the datasheet of the commonly found (in this country!) 
 HVR-1X-4 the max forward voltage drop -at-500 mA is 10 V. So, if 
your VOM has got a 6 V battery only, this battery voltage is not 
high enough to overcome that voltage drop.

You might want to use this circuit (please use constant distance 
font):

+ 24 V --1.5 kOhm--*--anode of MOD cathode--
                   |                        | 
                   |                        |
------------------V-----------------------------*
                                            | 
                                            |
--------------------------------------------

I've measured voltage drops around 6.1 V

Good luck!

Herwig