[time-nuts] FE-5680A Question

Magnus Danielson magnus at rubidium.dyndns.org
Wed Feb 15 22:37:29 UTC 2012

On 02/15/2012 11:17 PM, Bob Camp wrote:
> Hi
> If you look at an LPRO or FRS or any of the other brands of Rb's their sweep
> is very different. They don't spend very much time at the ends of the sweep
> at all. It's pretty much a triangle wave sweep up and back sort of thing.
> They don't seem to care weather they catch the lock going high to low or
> going low to high. The rate of the sweep is *much* slower than what FE is
> doing on these units. Since there isn't a "brain" in most of them, there's
> no pattern watching stuff there. They just look for a lock signal (amplitude
> out of the detector) and stop sweeping when they see it.

Indeed. For analogue logics of the old dinsaurs that I hurd in the 
basement a sawtooth or triangle scanning is a good strategy to track in, 
but for a processor logic you can do things a bit differently. Also, 
consider that the Q seems to be wide on the FEI 5680A you can sweep 
faster without missing the dip. Another aspect on speed is just how 
large the (needed) scan range is.


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