Oh, well, I have the original PRS10 manual as we (that is, the company) bought a new PRS10 one month ago. I was enquiring wether or not it can be scanned and sent to you. Now it no longer matters.
On Mon, Apr 2, 2012 at 11:35 AM, Stijn Nestra <[email protected]> wrote: > The PRS10 schematics are available on line from Didier. > See the following link: > http://www.ko4bb.com/manuals/**index.php?dir=05%29_GPS_**Timing/SRS<http://www.ko4bb.com/manuals/index.php?dir=05%29_GPS_Timing/SRS> > > Sincerely, > > Stijn > > Op 02-04-12 09:48, Azelio Boriani schreef: > >> OK, thank you. I'll collect the documentation you suggest to study it. >> Yes, >> the PRS10 manual available online has no schematic. The paper one does >> have. Does this means that Stanford Research want it not to be >> disseminated? >> >> On Mon, Apr 2, 2012 at 5:06 AM, Said Jackson<[email protected]> wrote: >> >> Hi Azelio, >>> >>> its a dual slope interpolator, much like the HP 5334A counter. In fact >>> the >>> 5334A service manual is very nice to go through to get lectured on how >>> this >>> works. The capture hardware is similar to the Linear Tech app note >>> written >>> by Jim Williams (mentioned in the time nuts archives). Basically its a >>> very >>> fast constant current source, and a high quality capacitor. Except Jim >>> charges the cap, then uses an analog to digital converter to capture the >>> time difference. We use a micro controller to capture the time difference >>> on the cap, then capture how long it takes to discharge the cap with >>> about >>> ~1000x slower current than the charge current. Hence we get ~1000x to 1 >>> time dilution, which means the underlying 16.66ns counter resolution >>> becomes a ~16.7ps resolution. While I have never seen the PRS-10 Rubidium >>> schematics (anyone have them in PDF format?) I gather from the >>> description >>> in the service manual that they do something similar to this. The >>> Wavecrest >>> DTS user manuals floating around on the internet also explain how this >>> works. So in short, all that is required to build a unit like this is a >>> bunch of fast analog charge hardware, and an analog comparator that can >>> trigger a counter capture event, and some software for calibration and >>> control... >>> >>> bye, >>> Said >>> >>> Sent from my iPad >>> >>> On Apr 1, 2012, at 4:07, Azelio >>> Boriani<azelio.boriani@screen.**it<[email protected]>> >>> wrote: >>> >>> Said, >>>> how complex is your 20pS time interval counter? Is it analog, FPGA, >>>> something else (if you can disclose some info, of course)? >>>> >>>> On Sat, Mar 31, 2012 at 11:44 PM, Hal Murray<[email protected] >>>> wrote: >>>> >>>> >>>>> [email protected] said: >>>>> >>>>>> I’ve seen that the peak to peak jitter is reduced from something like >>>>>> >>>>> 27 >>> >>>> ns >>>>> >>>>>> to< 10 ns. >>>>>> >>>>> >>>>> Is this a reduction of just the jitter, or is the actual accuracy to >>>>>> >>>>> UTC >>> >>>> also improved by this amount. >>>>>> >>>>> >>>>> Have you read the hanging-bridges paper? >>>>> Tom Clark and Rick Hambly: Timing for VLBI >>>>> http://gpstime.com/files/tow-**time2009.pdf<http://gpstime.com/files/tow-time2009.pdf> >>>>> I think that is the key to understanding this area. >>>>> >>>>> If you could average over many sawtooth cycles, you should get an >>>>> >>>> accurate >>> >>>> answer. >>>>> >>>>> The problem is that you don't get to pick how many cycles fit into your >>>>> averaging time. The sawtooth pattern is the beat between two >>>>> >>>> frequencies. >>> >>>> One of them is drifting with time/temperature. If you are unlucky, the >>>>> beat >>>>> frequency can be very very low. >>>>> >>>>> The sawtooth correction lets you correct on a cycle-by-cycle basis. >>>>> You >>>>> don't need to average over many samples. >>>>> >>>>> >>>>> -- >>>>> These are my opinions, not necessarily my employer's. I hate spam. >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> ______________________________**_________________ >>>>> time-nuts mailing list -- [email protected] >>>>> To unsubscribe, go to >>>>> https://www.febo.com/cgi-bin/**mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >>>>> and follow the instructions there. >>>>> >>>>> ______________________________**_________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to >>>> >>> https://www.febo.com/cgi-bin/**mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >>> >>>> and follow the instructions there. >>>> >>> >>> ______________________________**_________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/**mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >>> and follow the instructions there. >>> >> ______________________________**_________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/** >> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >> and follow the instructions there. >> >> > ______________________________**_________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
