Re: [time-nuts] Fine frequency adjustment in 5370B

2005-05-15 Thread Tom Van Baak
> Hi Tom, > I was aware of the accuracy of the timebase for TI measurements is not > that critical, and TI measurements were my reason for buying the 5370B > rather than a normal frequency counter. > > However, the fact remains the 5370B is a better *frequency* counter than > any others I have,

Re: [time-nuts] Fine frequency adjustment in 5370B

2005-05-15 Thread David Kirkby
Tom Van Baak wrote: That's what I was intending doing, although the adjustment as far courser than ideal on a counter with 11 digits. Many of us use HP 5370A/B's as *time interval* counters; typically to precisely compare two 1 PPS sources. In this case the 25 ps rms single-shot resolution of the

Re: [time-nuts] Fine frequency adjustment in 5370B

2005-05-15 Thread David Kirkby
Brooke Clarke wrote: Hi David: It's so easy to feed the PRS10 a 1 PPS from GPS so I don't understand your comment "I don't have anything locked to GPS yet, but even when I do, it is not always going to be that convenient for me" Hi Brooke, I will not be able to get a GPS signal where the test-equ

Re: [time-nuts] Fine frequency adjustment in 5370B

2005-05-15 Thread Tom Van Baak
> That's what I was intending doing, although the adjustment as far > courser than ideal on a counter with 11 digits. Many of us use HP 5370A/B's as *time interval* counters; typically to precisely compare two 1 PPS sources. In this case the 25 ps rms single-shot resolution of the counter is the

Re: [time-nuts] Fine frequency adjustment in 5370B

2005-05-15 Thread Brooke Clarke
Hi David: It's so easy to feed the PRS10 a 1 PPS from GPS so I don't understand your comment "I don't have anything locked to GPS yet, but even when I do, it is not always going to be that convenient for me" Have Fun, Brooke -- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~br

Re: [time-nuts] Fine frequency adjustment in 5370B

2005-05-15 Thread David Kirkby
John Miles wrote: Correct, the only adjustment on the 5370B is on the 10811 itself. Cheers. I thought that was the case, but confirmation is never a bad thing. The best way to set it is to note the deviation after a long warmup with the counter covers in place, then take everything apart and adjus

RE: [time-nuts] Fine frequency adjustment in 5370B

2005-05-15 Thread John Miles
Correct, the only adjustment on the 5370B is on the 10811 itself. The best way to set it is to note the deviation after a long warmup with the counter covers in place, then take everything apart and adjust the 10811 to remove the same amount of deviation. (If you set it to 10.0 MHz with t

[time-nuts] Fine frequency adjustment in 5370B

2005-05-15 Thread David Kirkby
The frequency of the oscillator in my 5370B seems to be a little off - at least according to my Standford PRS10 rubidium. Although the latter has not been calibrated recently, I suspect the rubidium is more accurate than the 10811-60111 in the 5370B, so was intending changing the latter to that