Re: [time-nuts] SR620 - any gotchas buying a used one?
David, Do download the manual. Consider getting the hardprint manual. The minumum you can expect of a seller is that they power the unit on, and it should not show an error on start-up. You can try to ask for them to do the performance check in the manual. If the frequency measure is somewhat off from 10 MHz when measuring against the internal time-base, that is nothing to worry about, as it only tells you that you need to do calibration of frequency offset (which is a time-offset in the hardware that needs manual calibration of compensation constant, which isn't hard to do). I recommend you to do both the performance check and calibration as you receive it. I had one which was suspect, but doing the performance check and calibration removed any doubt, it was in fact somewhat better than my first SR620. Cheers, Magnus On 11/22/2014 12:51 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: After regrettably selling my 5370B a few years ago, I decided to look for a used SR620. Are there any particular issues with these that could be tested by the seller prior to shipping it? I have not downloaded the manual yet, but I assume there's a basic test in there - probably similar to that in the 5370B manual. Were these available with a Rb oscillator? I see a seller on eBay that he has some Rb ones for $1500 extra, but I don't see it as an option on the SRS web site. Dr David Kirkby Managing Director Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT) ___ 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.
Re: [time-nuts] SR620 - any gotchas buying a used one?
Hi The one that I *always* forget: It has a fan. Who knows where it’s been. Pop the top and clean out any dust packed into the inside of the beast. It’s very easy to get used to gear that’s been in clean environments and get blind sided by the one that lived on the planet dust world. Bob On Nov 22, 2014, at 8:19 AM, Magnus Danielson mag...@rubidium.dyndns.org wrote: David, Do download the manual. Consider getting the hardprint manual. The minumum you can expect of a seller is that they power the unit on, and it should not show an error on start-up. You can try to ask for them to do the performance check in the manual. If the frequency measure is somewhat off from 10 MHz when measuring against the internal time-base, that is nothing to worry about, as it only tells you that you need to do calibration of frequency offset (which is a time-offset in the hardware that needs manual calibration of compensation constant, which isn't hard to do). I recommend you to do both the performance check and calibration as you receive it. I had one which was suspect, but doing the performance check and calibration removed any doubt, it was in fact somewhat better than my first SR620. Cheers, Magnus On 11/22/2014 12:51 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: After regrettably selling my 5370B a few years ago, I decided to look for a used SR620. Are there any particular issues with these that could be tested by the seller prior to shipping it? I have not downloaded the manual yet, but I assume there's a basic test in there - probably similar to that in the 5370B manual. Were these available with a Rb oscillator? I see a seller on eBay that he has some Rb ones for $1500 extra, but I don't see it as an option on the SRS web site. Dr David Kirkby Managing Director Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT) ___ 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. ___ 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] SR620 - any gotchas buying a used one?
After regrettably selling my 5370B a few years ago, I decided to look for a used SR620. Are there any particular issues with these that could be tested by the seller prior to shipping it? I have not downloaded the manual yet, but I assume there's a basic test in there - probably similar to that in the 5370B manual. Were these available with a Rb oscillator? I see a seller on eBay that he has some Rb ones for $1500 extra, but I don't see it as an option on the SRS web site. Dr David Kirkby Managing Director Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT) ___ 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.
Re: [time-nuts] SR620 - any gotchas buying a used one?
Hi The counter has a fairly extensive auto-cal / auto test built into it. Simply looping the output back to the input is about all the setup needed. Checking the calibration on the OCXO is the only thing that takes external gear. Past that, yes there are a variety of calibration settings and procedures that can be done to get the counter into perfect shape. Any of them could show up a problem. Doing all that is a bit beyond what I would expect from a normal seller. Bob On Nov 21, 2014, at 6:51 PM, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: After regrettably selling my 5370B a few years ago, I decided to look for a used SR620. Are there any particular issues with these that could be tested by the seller prior to shipping it? I have not downloaded the manual yet, but I assume there's a basic test in there - probably similar to that in the 5370B manual. Were these available with a Rb oscillator? I see a seller on eBay that he has some Rb ones for $1500 extra, but I don't see it as an option on the SRS web site. Dr David Kirkby Managing Director Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT) ___ 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.
Re: [time-nuts] SR620 - any gotchas buying a used one?
The SR620's manual is perfect, there is a whole chapter has detail information of performance test. You can use that way for check the counter's condition. Hui Zhang At 2014-11-22 07:51:41, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: After regrettably selling my 5370B a few years ago, I decided to look for a used SR620. Are there any particular issues with these that could be tested by the seller prior to shipping it? I have not downloaded the manual yet, but I assume there's a basic test in there - probably similar to that in the 5370B manual. Were these available with a Rb oscillator? I see a seller on eBay that he has some Rb ones for $1500 extra, but I don't see it as an option on the SRS web site. Dr David Kirkby Managing Director Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT) ___ 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.
Re: [time-nuts] SR620 - any gotchas buying a used one?
Hi Probably the best information out there on setting up a SR620 is buried in the archives of this list back a few years. The back and forth required on some of the adjustments is far from obvious. You do need to start from the manual and get it as far as the manual will allow. You then go into the “Time Nuts advanced” procedures. Bob On Nov 21, 2014, at 9:19 PM, Hui Zhang ba...@163.com wrote: The SR620's manual is perfect, there is a whole chapter has detail information of performance test. You can use that way for check the counter's condition. Hui Zhang At 2014-11-22 07:51:41, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: After regrettably selling my 5370B a few years ago, I decided to look for a used SR620. Are there any particular issues with these that could be tested by the seller prior to shipping it? I have not downloaded the manual yet, but I assume there's a basic test in there - probably similar to that in the 5370B manual. Were these available with a Rb oscillator? I see a seller on eBay that he has some Rb ones for $1500 extra, but I don't see it as an option on the SRS web site. Dr David Kirkby Managing Director Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT) ___ 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. ___ 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.
Re: [time-nuts] SR620 - any gotchas buying a used one?
Hi David: I like it. Traded an HP 53132 (user hostile menu system, an the 12 digits per second applies only to frequency, not time) for it. http://www.prc68.com/I/TandFTE.shtml#SR620 Fast precision measurement ( 1ps, 12 digits/sec) hint: http://www.prc68.com/I/FTS4060.shtml#SR620Fast Mail_Attachment -- Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html http://www.prc68.com/I/DietNutrition.html Dr. David Kirkby (Kirkby Microwave Ltd) wrote: After regrettably selling my 5370B a few years ago, I decided to look for a used SR620. Are there any particular issues with these that could be tested by the seller prior to shipping it? I have not downloaded the manual yet, but I assume there's a basic test in there - probably similar to that in the 5370B manual. Were these available with a Rb oscillator? I see a seller on eBay that he has some Rb ones for $1500 extra, but I don't see it as an option on the SRS web site. Dr David Kirkby Managing Director Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT) ___ 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.
Re: [time-nuts] SR620 - any gotchas buying a used one?
Hi Bob: I agree with you. But the chapter is a easy way to check your new counter when it arrived, and it's not only a calibration of just self test, it's testing counter's performance on some level. Regards. Hui Zhang At 2014-11-22 10:22:53, Bob Camp kb...@n1k.org wrote: Hi Probably the best information out there on setting up a SR620 is buried in the archives of this list back a few years. The back and forth required on some of the adjustments is far from obvious. You do need to start from the manual and get it as far as the manual will allow. You then go into the “Time Nuts advanced” procedures. Bob On Nov 21, 2014, at 9:19 PM, Hui Zhang ba...@163.com wrote: The SR620's manual is perfect, there is a whole chapter has detail information of performance test. You can use that way for check the counter's condition. Hui Zhang At 2014-11-22 07:51:41, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: After regrettably selling my 5370B a few years ago, I decided to look for a used SR620. Are there any particular issues with these that could be tested by the seller prior to shipping it? I have not downloaded the manual yet, but I assume there's a basic test in there - probably similar to that in the 5370B manual. Were these available with a Rb oscillator? I see a seller on eBay that he has some Rb ones for $1500 extra, but I don't see it as an option on the SRS web site. Dr David Kirkby Managing Director Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT) ___ 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. ___ 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.
Re: [time-nuts] SR620 - any gotchas buying a used one?
Hi If I follow your hint: I set the 620 up for a 1 second gate and then I ask for an average of 1,000 readings. This takes 1,000 seconds? Bob On Nov 21, 2014, at 9:32 PM, Brooke Clarke bro...@pacific.net wrote: Hi David: I like it. Traded an HP 53132 (user hostile menu system, an the 12 digits per second applies only to frequency, not time) for it. http://www.prc68.com/I/TandFTE.shtml#SR620 Fast precision measurement ( 1ps, 12 digits/sec) hint: http://www.prc68.com/I/FTS4060.shtml#SR620Fast Mail_Attachment -- Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html http://www.prc68.com/I/DietNutrition.html Dr. David Kirkby (Kirkby Microwave Ltd) wrote: After regrettably selling my 5370B a few years ago, I decided to look for a used SR620. Are there any particular issues with these that could be tested by the seller prior to shipping it? I have not downloaded the manual yet, but I assume there's a basic test in there - probably similar to that in the 5370B manual. Were these available with a Rb oscillator? I see a seller on eBay that he has some Rb ones for $1500 extra, but I don't see it as an option on the SRS web site. Dr David Kirkby Managing Director Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT) ___ 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. ___ 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.
Re: [time-nuts] SR620 - any gotchas buying a used one?
Hi From what I’ve seen, many 620’s that have been sitting for a few years will not operate until the calibration procedure is run. They drift far enough out that they pitch errors trying to do simple things. Let the beast warm up for an hour and run the cal as soon as you get a used one. Bob On Nov 21, 2014, at 9:34 PM, Hui Zhang ba...@163.com wrote: Hi Bob: I agree with you. But the chapter is a easy way to check your new counter when it arrived, and it's not only a calibration of just self test, it's testing counter's performance on some level. Regards. Hui Zhang At 2014-11-22 10:22:53, Bob Camp kb...@n1k.org wrote: Hi Probably the best information out there on setting up a SR620 is buried in the archives of this list back a few years. The back and forth required on some of the adjustments is far from obvious. You do need to start from the manual and get it as far as the manual will allow. You then go into the “Time Nuts advanced” procedures. Bob On Nov 21, 2014, at 9:19 PM, Hui Zhang ba...@163.com wrote: The SR620's manual is perfect, there is a whole chapter has detail information of performance test. You can use that way for check the counter's condition. Hui Zhang At 2014-11-22 07:51:41, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: After regrettably selling my 5370B a few years ago, I decided to look for a used SR620. Are there any particular issues with these that could be tested by the seller prior to shipping it? I have not downloaded the manual yet, but I assume there's a basic test in there - probably similar to that in the 5370B manual. Were these available with a Rb oscillator? I see a seller on eBay that he has some Rb ones for $1500 extra, but I don't see it as an option on the SRS web site. Dr David Kirkby Managing Director Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT) ___ 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. ___ 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. ___ 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.
