[time-nuts] 5370B and 10544 OCXO

[iovane at inwind.it]

Recently I bought for cheap a nice looking latest production but not working 
5370B. It turned out to be missing the 10811, its power supply card, and the 
relay. I borrowed these parts from my 5370A, and the 5370B worked fine. For 
some reasons today I've been swapping OCXO's between various counters. What I 
noticed on the 5370B is a different behavior in the test made feeding the time 
base output (rear panel) to the front panel input and the counter set to 
frequency. As we know (already discussed here), the readout in this condition 
is not 10 MHz (which would appear logical as the oscillator measures itself), 
but something like 9,999,999,xyx, with xyz varying continuously. Well, in my 
case, I noticed that:
-with the 10811 all of the three rightmost digits (xyz) were varying randomly;
-with a Piezo Crystal clone, same result as with 10811;
-with a 10544, only the two rightmost digits were varying.
I repeated the test several times.
This would mean to me that the 10544 is less noisy, at least mine. Am I right?
Antonio I8IOV