Hi, Quick correction, I wrote "HP 5314A and 5314B" and meant "HP 5316A and 5316B" which is the relevant here.
Sorry for that blunder. Cheers, Magnus On 2020-07-12 22:08, Magnus Danielson wrote: > Hi Wes, > > On 2020-07-12 00:51, Wes wrote: >> As I understand it this counter has an external reference input that >> isn't used directly as the time base but injection locks the internal >> time base. Does anyone here know how well this works. Is using a >> GPSDO as a reference a worthwhile accuracy improvement? > It was fairly easy to locate the operations and service manual for the > HP 5314A and 5314B and they both have the same input setup, which is a > "injection lock multiplier" which is switched in on case of external > reference. > > So, rather than injection lock the crystal oscillator, another > oscillator is switched in which is more a LC-resonator that triggers on > the edge of input. It's crude but good enough for the counter. > > Feeding it a proper frequency will help, but you want to first do > trimming to adjust the free-running frequency, which can be done using a > procedure described in the manual that forces is into self-oscillation > so that it can be trimmed. Then, injection locking will pull it > sufficiently close. > > It's crude but it works. This is not the counter they invested most in, > but it can still do quite a bit. It's a budget counter with ext ref and > HPIB. I have a 5314A which has neither of these, but may be suitable for > portable use or even battery use. > > Cheers, > Magnus > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
