[time-nuts] Input voltage for Zeeman on 5061A

John Ackermann N8UR jra at febo.com
Sat Jan 22 11:57:09 EST 2005


I tried the 42.82kHz frequency and wasn't able to see any peaks or dips 
at all.  53.53 gives peaks and dips, but not very pronounced.

John
----

Chuck Harris wrote:

> The Zeeman frequency is a characteristic of the tube.  Most FTS tubes
> have their main Zeeman peak at 42.820kHz, and the two peaks on either
> side are at 41.800kHz, and 43.800kHz.
>
> 1 Vrms is what the 5061 wants to see (The Zeeman input is a 50 ohm load
> IIRC).
>
> -Chuck
>
> John Ackermann N8UR wrote:
>
>> Anyone know how much voltage you need to drive the Zeeman input on 
>> the 5061A?  I just tried to set mine and found that the maximum 
>> output from my 3325A (3V RMS) was barely enough to see any wiggling 
>> at all on the beam current meter  I have another generator that goes 
>> up to 6V and that got me a bit more, but even then only a few meter 
>> divisions between peak and dip.
>>
>> Either I need a heftier generator (or maybe an impedance step-up), or 
>> we're back to the question of what is the right Zeeman frequency for 
>> an FTS tube in an HP chassis.
>>
>> Thanks,
>>
>> John
>>
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>
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