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Re: [Amps] HV Measuring.

To: <>
Subject: Re: [Amps] HV Measuring.
From: Alek Petkovic <>
Date: Mon, 17 Aug 2009 13:40:21 +0800
List-post: <">>
I've always used a junk box transformer and fed the 5V or 6.3V AC 
secondary into the primary of the hv transformer / dc supply and 
measured the exact AC input and the exact DC output.

I then measure the exact mains volts, divide that by the low primary 
volts that I previously recorded.

Then I simply multiply that result by the dc output I measured to get 
my final, no load hv reading.

The most dangerous part of the exercise is the measurement of the 
mains AC voltage.

No need for a hv probe. Just a mains rated multimeter.

73, Alek.

At 01:03 PM 17/08/2009, MIKE DURKIN wrote:

>I liked that idea so much .. i tried it ...
>I ran my amp off of 120V(125V actually) instead of 240V and the 
>lowest cap had 196V across it. ok that means that at 240V it would 
>be running at the max rated supply voltage ( it only has 400V caps - 
>bummer - HL-2k and P9306UL's yokagawa schematics call for 500V-umm 
>what gives??) 3136V calc'ed
>Might add another 330uf@400V for safe measure since iv got it open ...
> > Subject: [Amps] HV Measuring.
> >
> > G'day all....I am probably the dill of the bunch but to measure the HV
> > on my power supplies I measure between the bottom capacitor in the stack
> > and ground...8 capacitors, multiply the result by 8 for the HV...Maybe a
> > bit rough and ready but safer than probing arount the HT end of the
> > stack....
> >
> > 73...Bob VK3ZL..
> > _______________________________________________
>Get back to school stuff for them and cashback for you.
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