[Amps] HV Divider

[Bob Maser]

If you are using a 0-1ma FS meter it is typically 1000 ohms per volt.  This 
means that if you wanted a 2500V FS reading you would need 2500 * 1000 = 
2,500,000 ohm in the meter multiplier string.  I would think that you want a 
FS higher than 2500V, like 5000V, which would mean that you need 5,000,000 
ohms or 5 meg ohms in the meter multiplier string.  Then you need something 
to lift it slightly above ground, like 10K ohms.

Bob W6TR
----- Original Message ----- 
From: "KB0NLY" <kb0nly at mchsi.com>
To: <amps at contesting.com>
Sent: Sunday, March 01, 2009 7:47 PM
Subject: [Amps] HV Divider


I'm using GM3SEK's Triode Board for my 6m amp project using the GI-7B, i ran 
into a problem today with the power supply.  According to his manual, i sent 
him an email as well waiting for a reply, for 2500v i should use 10 1M Ohm 
resistors in series from the B+ line, on the end of that string of resistors 
there is also two 100k 1W resistors to chassis ground.  My supply is 2400V, 
measured with a HV meter i get 2380V.

The problem is the output of that divider is supposed to be 12v or less.  I 
put the positive of my meter on the end of the chain of resistors and i put 
the negative to chassis, 0V, nothing nada.  Then i put the negative to the 
0V lug on the secondary of the transformer and i get 113V.

How is this supposed to work that i can get 12v from it?????

73,

Scott KBØNLY

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