[time-nuts] Zeeman Audio Source?

John R. Ackermann N8UR jra at febo.com
Wed Jan 12 17:34:34 EST 2005


I like the HP 3325A synthesizer/function generator which goes from less 
than 1Hz up to (I think) 25MHz.  The "A" model is available pretty 
inexpensively on eBay; the "B" model is much, much more expensive -- I'm 
not sure what the differences are to warrant that.

John
----
Brooke Clarke wrote:
> Hi:
> 
> I tried to use my HP 204B audio source for the Zeeman test, but although 
> it puts out over 5 volts RMS into an open circuit, the voltage across 
> the 50 Ohm FTS4060 Zeeman input is only 0.33 Volts, not the 1 Volt 
> needed.  Can someone recommend an audio generator, hopefully available 
> for a reasonable price somewhere?
> 
> The HP manual says the frequency should be 42.82 kHz for zero offset.  
> There is a table listing a number of other frequencies that give 
> different offsets.  This was back in the days when a second got a new 
> definition each year, hence the different offsets, but today zero offset 
> is the standard.
> 
> Have Fun,
> 
> Brooke Clarke, N6GCE




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