From: Jim Yanik
Subject: Re: Kelvin-Varley voltage divider ?
Date: Thu, 9 Jan 2003 01:10:46 +0000 (UTC)
Organization: Friends of Lummox
NNTP-Posting-Date: Thu, 9 Jan 2003 01:10:46 +0000 (UTC)
"Todd K. Moyer" wrote in
> I just bought one on eBay for about $10 a few weeks ago for its
> museum-type qualities. Search for "voltage divider"; the one I bought
> was made by General Radio, and has 4 knobs, which gives you 1 part in
> 10000 control, guaranteed monotonic, and with my HP 3478A 5.5 digit
> multimeter, the thing looks darn near perfect. It's a beautiful thing,
> with a 1/4" thick aluminum panel front panel, and truly
> marvelous-looking selector switches inside. I have fun telling
> everyone it is a 13.5 bit DAC. Now, to figure out a practical use for
> "dsp1024" wrote in message
>> Hi all...
>> We have a device at work that we use to calibrate some equipment. It
>> has this selector type switches to set the output voltage. It looks
>> like the counter of an old VCR but with buttons on top and bottom. I
>> found out it
>> called a Kelvin-Varley switch. I'm having a hard time finding a
>> for them so I thought may be I can replace it with something else. I
>> was trying to find info on how it work and I'm so stuck. Plenty of
>> use this stuff but I can find actual theory on how a Kelvin-Varley
>> divider is wired.
>> Could someone point me in the right direction ? The one we have a 10
>> steps and 4 digits.
Generate a calibrated 10 or 100 VDC,and use the K-V to divide it down for
Jim Yanik,NRA member
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