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 adjust the 10811 to remove the same amount of deviation. (If you set it to 10.000000000 MHz with the covers off, it won't be there under typical operating conditions.)
That's what I was intending doing, although the adjustment as far courser than ideal on a counter with 11 digits.
I don't bother keeping mine calibrated, since everything runs off GPS.
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, so having a reasonably accurate timebase in the counter will be useful. Sure, putting in a rubidium locked to GPS would be nice, but not always practical for me.
Thanks very much John.
-- john KE5FX
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 of the rubidium.
Although when one removes the top cover of the 5370B, the 10811-60111 can be seen with its adjustment control, I believe this is a course adjustment (18 turns is supposed to move it +/- 10Hz, at least on the 10811A).
I know you can trim these oscillators with a fine control, using the EFC voltage. Is anyone aware of whether this is possible on the 5370B or not?
I have the service manual, and so no mention of it. Neither can I see any control, so I guess the answer is probably no. But the PCB the oscillator plugs into hidden beneath some shielding, so I am not 100% sure there is no pot.
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