On Thu, 25 Sep 2008 10:37:28 -0400, JW put finger to
keyboard and composed:

Does anybody know of a suitable replacement for the optical rotary
encoders that were used on older Agilent/HP 65XX and 66XX power supplies?
These were phased out on the newer generation supplies which use
mechanical types. Agilent no longer has any stock, and advises me to
replace the entire front panel PCB at a cost of $631.00.

I believe that the encoders are part #0960-0822. I have no documentation
on them. Pictures can be seen he
http://home.comcast.net/~66gtojayw/A..._encoder-1.jpg
http://home.comcast.net/~66gtojayw/A..._encoder-2.jpg

Thanks.

I believe that QRPG = Quadrature (?) Rotary Pulse Generator

Your encoder looks similar to the HRPG series.

HRPG Series Miniature Panel Mount Optical Encoders (H=housed?):
http://www.avagotech.com/docs/5988-5851EN

Pinout:

1. Ground (dot on bottom)
2. Channel B
3. Vcc (+5V)
4. Channel A
5. Shield (Housing Ground)

FWIW, the following URL states that the "HP optical encoders (HP
QRPG-A475) ... are 32 count per revolution, with quadrature output.
Actual Part#: HRPG-AS32#14C".

http://web.archive.org/web/200401031...a/robot2.shtml

Mouser carry this part (HRPG-AS32#59C):
http://www.mouser.com/search/Product...7nWCOk3A%3D%3D

Unfortunately the MOQ is 20 units @ $38 each :-(

Here is a Bourns 32PPR optical encoder (US$18, MOQ=1):
http://www.mouser.com/Search/Product...vD1LXCKg%3d%3d

Datasheet:
http://www.bourns.com/pdfs/em14.pdf

It may be worth noting that the following HP encoder also has a 5-pin
connector, but different pinout. Therefore I wouldn't assume that the
HRPG and QRPG pinouts are identical.

HEDM-55xx/560x & HEDS-55xx/56xx Quick Assembly Two and Three Channel
Optical Encoders:
http://www.avagotech.com/pages/en/mo...used_mid_size/
http://www.avagotech.com/cs/Satellit...&ssbinary=true

Pinout:

1. Ground
2. Not connected
3. Channel A
4. Vcc (+5V)
5. Channel B

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.