On Thu, 25 Sep 2008 10:37:28 -0400, JW <none@[EMAIL PROTECTED] > 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 do***entation >on them. Pictures can be seen here: >http://home.comcast.net/~66gtojayw/Agilent_encoder-1.jpg >http://home.comcast.net/~66gtojayw/Agilent_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. ****eld (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/20040103125811/http://walden.mvp.net/~chandra/robot2.shtml Mouser carry this part (HRPG-AS32#59C): http://www.mouser.com/search/ProductDetail.aspx?qs=YDL0qNrpDT495a7nWCOk3A%3D%3D Unfortunately the MOQ is 20 units @[EMAIL PROTECTED] $38 each :-( Here is a Bourns 32PPR optical encoder (US$18, MOQ=1): http://www.mouser.com/Search/ProductDetail.aspx?qs=SMQt91Li6bVlxzvD1LXCKg%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/motion_control_solutions/incremental_encoders/housed_mid_size/ http://www.avagotech.com/cs/Satellite?blobcol=urldata&blobheadername1=Content-Type&blobheadername2=Content-Disposition&blobheadervalue1=application%2Fpdf&blobheadervalue2=attachment%3B+filename%3DAV02-1046EN.pdf&blobkey=id&blobtable=MungoBlobs&blobwhere=1210899243425&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.
