[R-390] Hickok Tube Tester Calibration

[Barry Scott]

A list member set me straight on this.  I was approaching it a bit
incorrectly but understand it now.

Thanks,
Barry - N4BUQ

On Mon, Jan 6, 2025 at 11:51 AM Barry Scott <72volkswagon at gmail.com> wrote:
>
> I'm in the process of refurbishing my Hickok 752A and I have a general
> question regarding the calibration procedures.
>
> All voltage measurements are supposed to be taken with a 1000 ohm/volt
> meter and I don't have a meter like that.
>
> From what I understand, if one measures, for example, 150VDC with a
> 1000 ohm/volt meter, then the meter is placing a 1,000 ohms/volt x 150
> volts = 150,000 ohms load to the circuit being measured.  Using a
> 20,000 ohms/volt meter would only present a 3 megohm load for 150
> volts which is significantly different and result in a higher reading
> for that same 150 volts.
>
> Is there a way to "mimic" a 1,000 ohms/volt meter with a meter with a
> much higher sensitivity?  The closest meters I have are 20,000
> ohms/volt so looking for some suggestions.
>
> Thanks,
> Barry - N4BUQ