[time-nuts] Zeeman frequencies

[John Ackermann N8UR]

Hi --

I just got off the phone with Corby Dawson who was helping me through 
the power-up of my newly acquired 5061A.  (The replacement FTS tube had 
slipped during shipment, breaking the HV connector for the ion pump.  
It's fixed now, and I have a nice green "Continuous Operation" light.)

Anyway, I asked him about the Zeeman frequency for an FTS vs HP tube.  
His answer was that the proper frequency depends on the electronics in 
the chassis, not the tube.  HP specified two different frequencies, 
42.82 (in the early manuals) and 53.53kHz.  Either one will work, but 
the higher frequency gives slightly better accuracy (maybe a sharper 
peak, so better resolution?).  The 5061B manual says that 100Hz of 
Zeeman offset is equal to 1x10e-12.

John