[time-nuts] FA2 counter

[Mark Sims]

Miy FA2 came in today.   A very quick test shows that it works.  It does not appear to have the -0.0002 Hz freq measurement bias that the FA1 has.

The 0.1 second gate time mode is pretty useless... there appears to be  a 300 msec dead time between measurements in 0.1 (and 10 sec) gate time modes so you only get a new reading every 400 msecs.  10 second gate time produces a reading every 10300 msecs.  1 sec gate time outputs readings every 1100 msecs (like the FA1).

It auto-detects the presence of an external reference... no way to manually switch between internal and exterrnal references.  I have not done any testing on the internal ref or the high freq channel.

The screen shows a LPF setting and a 50 ohm setting... no idea if these are switchable.... there is no documentation.  

The screen shows the input signal level.