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

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 > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > >