Hi I believe what you are going to find is that the 3586 has an IF strip in it. It does a heterodyne process to the IF center frequency and then indicates things from there. If the IF strip is out of alignment, you get a reading error. Probably worth digging into the service manual on the 3586.
Bob > On Apr 24, 2017, at 6:26 PM, Jerry Hancock <je...@hanler.com> wrote: > > Orin, Thanks, this goes beyond interesting and I don’t know how you found > it. I’ll be staring at this doc for the rest of the week. I have a dozen or > so of the Nucleo boards around include the high end F7 types so I’ll see if I > can duplicate their code on the System Workbench they reference (and I have > installed). > > This afternoon I hooked up the output of my 3586 F0 (with the GPSDO > reference) set to 15,000,000.0Mhz and then used my 3336 set to the same > (again with the GPSDO) to see if I had any creep on my TDS3054B scope after > syncing the two signals. Just setting the 3336 to .001 higher causing the > sine waves to go out of sync noticeably in a minute. It’s been running about > 2 hours and they still overlap perfectly when set to the same frequency. > > I think we all know what the issue is here in that the 3586 counter is > probably adding a count here or there. It’s just curious that it never seems > to drop a count. I would have thought I would see +.1 and -.1 with an equal > distribution over a reasonable period of time of a few minutes but I don’t; I > always see the +.1 or .0, never a 999.9 count (-.01). > > If someone has a 5335 counter in the SF bay area they would like to unload, > please send me a note at meters at hanler dot com. > > By the way, your Geller ref is still running perfectly. I’ll have to send it > back to you for calibration soon as I think I have had it a year. > > Jerry > > _______________________________________________ > 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.
