And the schematics? I've tried without success. Repairing hardware w/o schematics is pretty tough.
-John =========== > Regarding the SR620 counters, I must have missed something.... It > seems to me that SRS is providing about as much support as Tek or > Agilent. All three offer PDF manuals and repair service. I doubt any > of them have free telephone repair support for out-of-warranty > products. > > I did a Google search for "stanford research sr620 manual pdf" and it > returned a number of sites, including SRS and NASA, that had the SR620 > manual available for free download in PDF format. I had looked for > that manual several years ago and found it then too. I did a quick > compare against the paper copy of the manual and it seems to be > similar although I will not say exactly the same since I didn't look > that close. > > Since the manual has full directions for using the counter and for > doing calibration, I don't understand the comments that SRS doesn't > support the product and make the info available. The schematics are > not included in the PDF manual but that is true of most electronic > products. I expect my paper manual has them although I haven't > checked. > > Regarding the cost of repairs, I don't care what company you talk to, > they are ALL too expensive for me. But since I didn't buy the > equipment new with a warranty I don't see where that is their problem. > I bought my car out of warranty and I don't expect the dealer to do > repairs for cheap. I have several pieces of test equipment that were > labeled "Not Economical To Repair." That is why they were in the scrap > bin. But they work good enough for me to use as long as I can live > with the fault. > > I do like the counter even though I've never used any of the advanced > features it has. My only complaint was the 10^-6 accuracy of the TXCO > reference oscillator but since I can calibrate it at will and can use > my Z3801A as an external reference, I can live with that. Somewhere > along the line I need to do some research or get one of the gurus on > the reflector to explain how to use the SR620 for doing Allen variance > and other quality checks of the various GPSDO, rubidium, and OCXO > oscillators I've collected in recent years. That is about the most > advanced feature I need from the SR620. > > I probably don't qualify as a real time-nut since my main interest is > to get my 10GHz station within a few hundred Hz of 10368.100 MHz. A > few parts in 10^-11 is good enough for that..... And I would like to > compare my various reference oscillators just to verify they are > working as well as can be expected. But that doesn't make me a REAL > time-nut.... :-) > > I don't intend to rekindle the previous discussion, I just don't > understand the negative comments. I have several SR620 counters and > for a 1GHz counter I think they are pretty good. For higher > measurements I got lucky on eBay purchasing an EIP 25B counter that > seems almost new. I didn't get as lucky with the HP 5340A I bought > first. Expensive and unobtainable mixer parts make the 5340A > unrepairable..... > > I do enjoy the technical discussions on the list. I particularly liked > the discussion about rejuvenating a rubidium lamp. The N4IQT web page > mentions the procedure but the time-nuts discussion provides a lot > more detail. That should be added to a web page somewhere along with > long term measurements of the results to indicate how the fix is > holding. I'm sure there are a lot of people who would be interested in > extending the life of their old rubidium oscillator. Having that info > would certainly make me sleep better if buying a surplus rubidium on > eBay..... > > 73, Doug Reed, N0NAS. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
