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Re: [Amps] What's wrong here- dropping resistor for DC meter?

To: amps <>
Subject: Re: [Amps] What's wrong here- dropping resistor for DC meter?
From: Ron Youvan <>
Date: Sat, 09 Jul 2011 08:37:48 -0400
List-post: <">>
Ed Heimbach wrote:

>   Want to meter HV out. Power supply variable from 0 through 4.5 kv dc
>   Have 1 through 5 v DC movement.
>   I built dropping resistor string to multiply meter by 1000X.
>   Meter now has a non-linear response.
>   I.E., 1 volt position corresponds to 1000 volts, 3.25 volt on meter scale  
> equals 4.5kv.

> It would be nice if my max. volts (4.5 k) corresponded with the 4.5 mark on 
> the scale card.

>   Easy way out would be to  jiggle resistor values to get mid point on scale 
> (2.5 volts) to correspond with 2.5 kv, and then make new meter scale to agree 
> with indicating needle.

>   Any better solutions?

   Put a 1 or 2 k Ohm resistor at the bottom of the bleeder string then put a 1 
mA meter across it, 
re-calibrate the meter card for k Volts.
          Firings will continue until morale improves.
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