[time-nuts] Zeeman Audio Source?
Mike Feher
mfeher at eozinc.com
Wed Jan 12 20:29:35 EST 2005
I also always use my 3325A for the Zeeman test. I usually run the 3325A off
of an external source. - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of John R. Ackermann N8UR
Sent: Wednesday, January 12, 2005 5:35 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Zeeman Audio Source?
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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