[Amps] Error - safety issue

[Gary Schafer]

That gives you two diodes in series and back to back. If you only want one
diode voltage drop then you need to connect the + and - together and the two
AC leads together. Then connect the AC leads point to one side of the meter
and the +- point to the other side of the meter.
That will give one diode junction voltage drop only and back to back with
two diodes in parallel.

73
Gary  K4FMX

> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of Steve Thompson
> Sent: Sunday, December 24, 2006 11:06 AM
> To: amps at contesting.com
> Subject: [Amps] Error - safety issue
> 
> A while ago there was a discussion about replacing a meter protection
> diode. I suggested using a 35A bridge, using the ac connections to give
> 'back to back' diodes so polarity didn't matter.
> 
> A very important point - you have to short the + and - together for this
> to work. If you don't, you end up with diodes back to back in series,
> and get no protection. That can be a BIG safety issue if your meter or
> metering resistor blows open when there's a glitch.
> 
> Sorry!
> 
> Steve
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