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@mchsi.com>
To: <amps@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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