[time-nuts] HP 5061 zeeman frequency experiance

John Miles jmiles at pop.net
Tue Oct 4 11:26:19 EDT 2011

> But does anyone have comments on the meter approach HP suggested.
> I really need to understand whats semi normal for  old tube.
> I suspect I may be sitting near the noise floor of the system.

You've checked the 5060A manual to see if they give noise-floor test
details, correct?

> As for the network analyzer I just happen to have a HP 8505 so may give
> a try. Suspect I will see the fingers but very close to the noise floor.

The 8505 may not be stable enough to let you see what's going on, but it's
not too hard to rig up something else that will be.  I don't know if you've
seen my attempt at sweeping a 5062C tube:


 http://www.leapsecond.com/images/cfield.gif is another nifty manual-sweep
plot.  I'm unsure of the tech details behind Tom's setup but it was probably
more manageable than mine.  I think he just plotted the meter current, with
the tube running in its native 5061A habitat.

-- john, KE5FX

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