Re: [time-nuts] Using 5335 frequency counter for timing
I tried reading the 5335 over GPIB. In the case where I am measuring frequency I get the expected number of digits. In the case where I am measuring A->B, I only get nanoseconds (e.g 3E-9; or 4E-9). On my scopes, I was able to measure the delta at 3.28 nanoseconds with both scopes close within .01 nanoseconds. I was measuring the delta between 1M and 11.5” of RG316 cable. With a published velocity factor of .695 and 3.28E-9 seconds difference, the delta came out to 27” vs the measured 27.87”. Of course the RG316 VF wasn’t accurate to the number of digits needed to get any closer. I was demonstrating the precision of the equipment I was using to my son who is becoming somewhat of a mad scientist like his father. > On May 7, 2017, at 8:15 PM, Hal Murray wrote: > > > je...@hanler.com said: >> I thought I had seen somewhere where people were getting higher resolution >> using software along with the 5335, no? > > I don't know about the 5335, but if you talk to a 5334 via GPIB, you can get > more digits than fit on the display. > > > -- > These are my opinions. I hate spam. > > > > ___ > 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] Using 5335 frequency counter for timing
My Racal-Dana 1992 is the same way; its time interval mode is limited to the 1 nanosecond interpolated resolution of the counter. Some counters support time interval averaging which will produce much much higher resolution but often they have a minimum time interval. If the transmission line to be measured is configured as a shorted line, then the pulse width can be measured instead to determine the line length and pulse width averaging is much more commonly supported. On Sun, 7 May 2017 22:05:58 -0400, you wrote: >Hi > >The 53131 and 53132 will get you more resolution. The TICC, the 5370, and the >SR620 will do even better. None >of them will do as well as a really fast scope. > >Bob > >> On May 7, 2017, at 8:52 PM, Jerry Hancock wrote: >> >> I was showing my son how we could measure the difference in cable lengths by >> using the velocity of light and cable velocity factor. I used a scope to >> measure the offset and was then thinking the 5335 could do it more >> accurately, but I was wrong, as it only reports to the nanosecond. I >> thought I had seen somewhere where people were getting higher resolution >> using software along with the 5335, no? ___ 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] Using 5335 frequency counter for timing
On Sun, May 7, 2017, at 20:11, Hal Murray wrote: > kb...@n1k.org said: > > None of them will do as well as a really fast scope. > How accurate is the clock in a scope? Do the high end scopes have an > external clock input? My scope (Keysight MSOX3104, so 1 GHz) is rated at ±1.6 ppm (after a 30 minute warmup and ±10C from calibration temperature). The 3000 series and below don't have 10 MHz external reference inputs; I know the 4000 series does. /gp ___ 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] Using 5335 frequency counter for timing
kb...@n1k.org said: > None of them will do as well as a really fast scope. How accurate is the clock in a scope? Do the high end scopes have an external clock input? I remember playing with a scope many years ago. Trigger on a PPS from a GPS, look at the next PPS. It should be 1 second later. I think the scope I was using was off by 6 PPM. I'd expect that there would be a crossover. For short times, the scope would be better. For long times, the better crystal (or external input) in the 5335 would take over. -- These are my opinions. I hate spam. ___ 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] Using 5335 frequency counter for timing
je...@hanler.com said: > I thought I had seen somewhere where people were getting higher resolution > using software along with the 5335, no? I don't know about the 5335, but if you talk to a 5334 via GPIB, you can get more digits than fit on the display. -- These are my opinions. I hate spam. ___ 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] Using 5335 frequency counter for timing
Hi The 53131 and 53132 will get you more resolution. The TICC, the 5370, and the SR620 will do even better. None of them will do as well as a really fast scope. Bob > On May 7, 2017, at 8:52 PM, Jerry Hancock wrote: > > I was showing my son how we could measure the difference in cable lengths by > using the velocity of light and cable velocity factor. I used a scope to > measure the offset and was then thinking the 5335 could do it more > accurately, but I was wrong, as it only reports to the nanosecond. I thought > I had seen somewhere where people were getting higher resolution using > software along with the 5335, no? > > Thanks > ___ > 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] Using 5335 frequency counter for timing
I was showing my son how we could measure the difference in cable lengths by using the velocity of light and cable velocity factor. I used a scope to measure the offset and was then thinking the 5335 could do it more accurately, but I was wrong, as it only reports to the nanosecond. I thought I had seen somewhere where people were getting higher resolution using software along with the 5335, no? Thanks ___ 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] Time-nut going England!
Hey there! Sorry for my late response. The last weeks have been extremely busy and my upcomming trip to the UK didn't exactly help. Thanks to everyone I have now a decent list of things to do. If anyone lives in the general London area and would like to have a beer/tea/hot chocolate together, feel free to send me a message. Attila Kinali On Wed, 26 Apr 2017 15:05:52 +0200 Attila Kinali wrote: > Hi > > I'll be in the UK for three weeks and will have a "free" week > between 13th and 20th of May. I will most probably be around > the London area and maybe spend a day or two in Southampton. > > If someone wants to meet for a beer or cup of hot chocolate, > or knows of time-nutty things to do, please let me know. > > I would also appreciate if someone knows an affordable place > to stay at in London, so that it doesn't strain the purse > of this poor student too much. > > Attila Kinali > > -- > It is upon moral qualities that a society is ultimately founded. All > the prosperity and technological sophistication in the world is of no > use without that foundation. > -- Miss Matheson, The Diamond Age, Neil Stephenson > ___ > 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. -- It is upon moral qualities that a society is ultimately founded. All the prosperity and technological sophistication in the world is of no use without that foundation. -- Miss Matheson, The Diamond Age, Neil Stephenson ___ 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] Trimble GPS board (65256, 57963)
The "Trimble 57963-C" and "Symmetricom UCCM 089-03861-02" boards were previously discussed in August 2015. Over the past few weeks, the prices have decreased recently. Sergiy in Kyiv, Ukraine reverse engineered some of the pin functions on the 50-pin connector of these OCXO boards. http://tipok.org.ua/node/53 These modules have no direct NMEA support, but have their own binary protocol and additional signals, available on the 50-pin connector. Should be useful for stable 10MHz and 1PPS signals. Notes on UCCM-P > http://abelian.org/vlf/tmp/notes-57963.txt -- EEVBlog also commented in these Trimble units (supposedly BG7TBL uses in some products). https://www.eevblog.com/forum/projects/trimble-65256-5v-10mhz-as-fitted-in-trimble-gpsdo-and-some-bg7tbl-output-level/ Andy Brown's Teardown Blog of the BG7TBL GPSDO http://andybrown.me.uk/2016/11/12/gpsdo-ebay/ YouTube Video https://m.youtube.com/watch?v=vH1q_Mh4luY greg w9gb Sent from iPad Air ___ 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.
