On 07/ 9/11 01:06 PM, 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?
>
> 73 ab3ht
There's no reason what you have done should be non-linear.
Perhaps there's a diode been put in the meter to prevent damage due to
overvoltage. That could clamp the range. It's a bit silly, as its already
clamping. A more sensible thing would be a 7 V zener if someone wanted to stop
damage.
--
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