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Re: Measuring HV capacitor voltage (fwd)

---------- Forwarded message ----------
Date: Sat, 21 Jul 2007 22:19:03 EDT
From: FIFTYGUY@xxxxxxx
To: tesla@xxxxxxxxxx
Subject: Re: Measuring HV capacitor voltage (fwd)

In a message dated 7/20/07 3:11:15 P.M. Eastern Daylight Time,  
tesla@xxxxxxxxxx writes:

>    As a general note I ALWAYS connect a 1N4007 or  equivalent across  

>meters with the anode to the + terminal.  The normal full-scale  voltage 

>drop for most meters is 50 mV although some cheaper ones have as much  as 

>200 mV.  In any case the diode leakage at that current is too  small to 

>change the reading but the diode will still conduct around 0.7 volts  and 

>protect the meter from burnout.

    I've seen a few old surplus panel meters with  diodes, and always 
wondered why they did this.
    Thanks for the tip!
-Phil LaBudde
Center for the Advanced Study of Ballistic  Improbabilities

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