On Fri, 8 Aug 2008 17:52:49 -0700, (Dave Platt)
put finger to keyboard and composed:

The rotary encoder in my Wavetek 75 arbitrary waveform generator is
physically broken, and it's impossible to hook anything up to the broken
legs to probe the specs.

I'm totally new to encoders and I'd appreciate if anybody can offer any
advice on finding a suitable replacement. I couldn't find the service
manual for Wavetek 75, so all the information I have is the encoder
itself:

http://www.stanford.edu/~wonghoi/DC/...coderFront.png
http://www.stanford.edu/~wonghoi/DC/...ncoderBack.png
http://www.stanford.edu/~wonghoi/DC/...EncoderCap.png

Hmmm.

Based on the photos, it appears to be a mechanical rotary encoder,
with a two-bit quadrature output and a common terminal. By my count
there are 13 or 14 contact fingers per output per quarter-revolution
of the control... this would allow for 50-some pulses per revolution
for each of the two channels, or around 200 counts per revolution if
you're doing the usual sort of quadrature decoding.

The cap is stamped with a "50". Could that be the number of pulses?
BTW, that's a Matsu****a logo. I can't guess at what "6L" might mean,
though. Could it be a part number series?

FWIW, there are some Wavetek manuals he
ftp://bama.sbc.edu/downloads/wavetek/

Would this wavegen have a similar encoder?
ftp://bama.sbc.edu/downloads/wavetek/275/

- Franc Zabkar
--
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