[Amps] HV Divider, Problem Solved

[KB0NLY]

The handbook is sitting right next to me and I still don't see the math I'm 
looking for.  I need the equation that I can fill in to determine the high 
voltage when I know the value of the string and the output of if, no meter 
involved other than a VOM to check the output of the divider.  See what I'm 
saying now?

Just a comment also on the handbook, a lot of you guys keep referring to it 
as the bible, well I have five editions of it and I still can't find some of 
the info that you guys know in it, and that's even with searching the .pdf 
version of it on the computer once I know the answer!  Seems to me the 
handbook is a bit lacking.

Thanks and 73,

Scott KBØNLY



----- Original Message ----- 
From: "Bob Maser" <bmaser at tampabay.rr.com>
To: "KB0NLY" <kb0nly at mchsi.com>; <amps at contesting.com>
Sent: Sunday, March 01, 2009 2:25 PM
Subject: Re: [Amps] HV Divider, Problem Solved


>I gave you the answer in my previous.  Read about measuring voltage using a
> ammeter, which is what you are really doing.  Find a 1ma full scale 
> AMMETER
> and use 5 megohms in the meter multiplier string.  When you connect the
> AMMETER across the 100K ohm resistor and it will give you a full scale of
> 5000V(1MA on the AMMETER.  If you insist on using the 10 megohm string 
> then
> you will have a meter that is giving you a full scale of 10,000 volts. 
> Read
> the Handbook.
> Bob W6TR
> ----- Original Message ----- 
> From: "KB0NLY" <kb0nly at mchsi.com>
> To: <amps at contesting.com>
> Sent: Sunday, March 01, 2009 8:15 PM
> Subject: [Amps] HV Divider, Problem Solved
>
>
> Well i don't know how this amp was working before i started the
> modifications but i pulled the resistor from B- to chassis ground, at an
> AMPS member suggestion, to measure it, it was open!  So i grabbed an new
> wirewound vitreous resistor out of the drawer and put it into place and it
> now works perfectly and i have 11.68v off the divider.
>
> I'm not totally clear on the math here though, so if someone wanted to
> comment here is my remaining question..
>
> I have 10 1M ohm resistors in series, so 10,000,000 ohms, and i have 
> 11.68v
> off the divider.  How do i reverse the math to determine the value of the
> high voltage knowing the output of the divider?  See what i'm saying?  I
> know what i measured before using the HV meter, and i know what i have 
> after
> the divider, just wanted to see if they match up.
>
> I have a level that will work with the board now, but i want to understand
> it better.
>
> Thanks and 73,
>
> Scott KBØNLY
>
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> Amps at contesting.com
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>


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