> Since, at various times the HP5370 used a discrete ECL gate crystal > oscillator, an HP10544A, and an HP10811A as the internal reference, it > would also be useful to indicate which of these a 5370 uses as its > internal reference.
2300-series 10811A in this case. > Taking the external 1MHz sinewave (EXT reference for HP5370) and > assuming input attenuator set to 1x, and the 2 inputs are connected in > parallel to the START BNC then the corresponding trigger circuit noise > for 0.05V pk input (input signal is attenuated by 2 at the trigger > circuit inputs for 50 ohm Zin ) is about 123uV rms for both the START > and STOP channels which seems plausible.This gives about 50ps noise > induced jitter at 1V peak amplitude. However since the time interval > mode isnt specified See other post (+/- TI). > nor are the number of samples taken, > these > calculations are somewhat uncertain. You end up having to specify a pretty broad range of readings no matter how many samples are taken. Lots of jitter in the jitter readings. :) I was using 10K samples and watching the display for 4-5 updates when I recorded the numbers. That's why they're all given as a fairly-vague range of values. (I don't get anywhere near the kind of repeatability that Ulrich hinted at in the table he posted.) > Also the intrinsic jitter of the source is not known (to me at least). > At 2V peak the noise induced trigger jitter could be 25ps with other > noise say 10-12ps. True, the 3325 seems poorly-characterized in this respect. I have never seen jitter specs for it. -- john, KE5FX _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
