Brooke Clarke wrote: > Hi Ulrich: > > The SR620 has a 1 kHz Reference output that's derived from the 10 MHz > external > clock input. It also has a Gate/Arm function. > > Appendix B in the PRS10 Manual explains how to use these two features to make > 1,000 time interval measurements per second thus averaging the 20 ps one shot > way down. http://www.prc68.com/I/PRS10.shtml > > The time interval armed 1,000 times per second and the difference between > zero > crossings of a pair of 10 MHz signals are measured. So the range of > measurement is 100 ns before rollover. I think at least one of the test > signals needs to be 10 MHz to drive the external clock input to get the 1 kHz > reference. But you could use Toms PIC divider to generate a 1 kHz signal > from > about any test signal and use the same method. > http://www.prc68.com/I/FTS4060.shtml#SR620Fast > http://www.prc68.com/I/TandFTE.shtml#SR620 > > > Have Fun, > > Brooke Clarke > Brooke
What about the effect of the phase modulation of the 1kHz output by the 100Hz, 10Hz, 1Hz outputs due to simultaneous switching effects from such dividers? Bruce _______________________________________________ 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.
