From: "Todd K. Moyer"
Subject: Re: Kelvin-Varley voltage divider ?
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Tue, 7 Jan 2003 23:02:31 -0800
NNTP-Posting-Date: Wed, 08 Jan 2003 00:55:03 CST
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 it...
"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 devices
> 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.