The encoders for vertical and horizontal scale on my Rohde & Schwarz scope have begun to skip. It's not the worst of problems, about half of the detent clicks still result in a signal, as determined by KeyTestTool.exe, but obviously I would still like to repair the problem. I opened it up:
https://www.eevblog.com/forum/repair/rohde-schwarz-rto-encoders/?action=dlattach;attach=775461;imageI think I see a pattern. November 2009 must not be a good vintage for encoders
The numbers didn't lead to any direct hits, but by googling parts of the numbers I found some likely descendants, the E33 line of encoders from ELMA. Here's an overview sheet:
https://www.elma.com/-/media/product-files/region-emea/rs/02-rotary-encoders/type-e33/document/ch14-rs-incremental-encoder-typee33-datasheet-e.ashx?la=en&hash=9E0AC5789AC6C015A8DAC1FFF55E709D8A8843FEFortunately, the descendants seem to keep the serial number conventions, because I was able to rationalize all of the numbers based on their decoding diagram. For instance,
* S - SMT vertical
* N - Non-threaded 7x6mm shaft
* 0 - No push button
* 2 - 16 detent, 8PPR, 1.5Ncm
* 0 - IP60 rating
* -
* N - No included shaft
* 00 - (included shaft code would have gone here)
* R Tape & reel with vacuum plug
* -
* MMYY date codes land within the ~ 2 years prior to the scope manufacture date
Unfortunately, distributor availability is, uhh, limited:
https://octopart.com/search?q=e33-sn Within the octopart-o-sphere, the only parts of this line that I can find available for shipping to the US are E33-SN610 from Chip1Stop. Most of the specifics are different but they would at least fit the physical profile and preserve the detent:pulse ratio. Two questions:
1. Does anyone know how to mount / unmount the shafts? There are a couple of diagrams, but it's not obvious to me, an encoder newbie, what to make of them.
2. Does anyone happen to know any ELMA distributors that might not show up on octopart? I gather that they're a Swiss company, but I'm not familiar with the European distributor scene.