Jerry It depends on the unit and age. There are not rules of thumb from my experiance. Some of the approaches in HP as an example Have switches and demand a specific frequency and level. Some lock an internal reference to any multiple of a reference freq like 5 or 10 MHz. Some are direct some are phased lock. I actually look at each piece of HP gear and see whats going on. Lazy can get you in trouble as I learned. Regards Paul WB8TSL
On Sun, Jan 7, 2018 at 10:21 AM, Jerry Hancock <je...@hanler.com> wrote: > I’m being a little lazy as I can check the schematics, but in the general > case, do HP counters, frequency generators, etc, switch to the external > reference when one is available or discipline the internal oscillator? Are > there brands of test equipment that generally discipline vs switch? > > Third question, again generally, when you discipline an oscillator, what > impact does this have on the oscillator's phase noise? I assume this third > question depends on the discipline loop (if I’m using the correct term). > > 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.
