[time-nuts] FA2 counter

[Mark Sims]

Attached is the FA2 noise floor test.  The FA2 was clocked by a HP-5071A 10 MHz output.  The FA2 frequency input was the FA2 reference output signal (which should be the 5071A output, maybe with some buffering distortion).   I didn't have the cables and T-adapter handy to split the 5071A output into the FA2 ref and signal input connectors.

The plot also shows the phase measurement of the input signal.

I am now looking at the FA2 internal oscillator performance.  Mine was shipped with it set 0.1 Hz high.  I use the tweak pot to get it within 0.003 Hz (with a little patience and twiddling you should be able to get it to +/- 0.001 Hz.   I am measuring the FA2 internal osc performance by running the FA2 with its internal osc as the reference and measuring the 5071A 10 MHz signal.
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