[volt-nuts] Dial-a-vider

[J. Forster]

If you want it for AC, I'd suggest getting a Dekatran or equal. I woulkd
expect them to have much lower output impedance.

I'm pretty sure I've seen ratio transformers available with 7 decades of
switches, maybe more. Singer/Gertsch and ESI and maybe GR.

I've not seen DC dividers that good.

Best,

-John

=================



> I know someone who has a General Resistance Dial-a-vider DV-4107 that I
> may
> be able to trade for. It has input terminals marked "700 V Max" and seven
> decade switches. It is also labeled "Input Resistance 100,000 Ohms".
>
> I Googled, but can't find any information at all on this. The closest that
> I find is a Dekavider. This one is very similar to the Dial-a-vider, only
> not as tall and with different knobs.
>
> http://www.ebay.com/itm/ESI-Dekavider-RV622A-6-Decade-Kelvin-Varley-Voltage-Divider-/171095439907
>
> I  took a peek inside the Dial-a-vider and it looks very high quality. The
> resistors appear to be custom made. There is no percentage marked, but
> each
> one has a serial number. There are wire stubs, which I assume are somehow
> used to trim things. On the back are pin jacks for each decade, which I
> assume are used for calibration.
>
> I did a quick check by hooking it up to my VS330 DC reference and looking
> at the output with my HP 3478A, which we know to be off a bit (I assume
> that its relative readings should be OK). All but one of the decade
> switches give me very accurate steps.
>
> The reason I'm interested in this is not so much for use with a DC
> reference, as I already have the VS330. I was thinking about using it for
> AC, if I can buy or make a reasonably accurate AC reference.
>
> Is anyone familiar with this particular model? Other comments?
>
> Joe Gray
> W5JG
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