[time-nuts] Measurement of frequency of HP 8720D option 1D5oscillator after switch on

Bob Camp kb8tq at n1k.org
Sat Oct 4 22:42:57 EDT 2014


For what ever reason, HP sold the 5370 as a “time instrument” and discouraged it’s use as a “frequency instrument”. I have absolutely no idea why. That’s certainly the way the local sales guys presented them. They considered me to be a bit “nutty” to buy one to measure frequency. There were a lot more places interested in checking frequency to a precise level than were interested in checking time to the same sort of level. The SR-620 always was actively sold as a frequency counter as well as a precise time instrument. 


On Oct 4, 2014, at 10:25 PM, Tom Van Baak <tvb at LeapSecond.com> wrote:

> I have several SR620 and HP5370 in my lab. My preference has always been the SR620; by size, features, front panel, calibration, programming. But both counters do the job so if you can find either one at a reasonable price go for it. The SR620 is still a current & supported product at SRS.
> Over the years I've visited quite a few professional time & frequency labs and always see SR620's in use. Rarely, any HP5370. Not sure what that means.
> Again, either one is fine for time nut use. One of these days I should do a detailed performance comparison among a large set of both counters.
> /tvb
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