[time-nuts] FE-5680A Voltage tolerance

Rob Kimberley robkimberley at btinternet.com
Fri Jan 20 06:09:18 EST 2012


I've had one of mine running on a bench supply for about 2 days now. Have
just tried turning the voltage down, and things started to get unstable at
around 12.5V. It didn't drop out of lock however until about 9V.

Rob Kimberley

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Peter Gottlieb
Sent: 20 January 2012 04:16
To: time-nuts at febo.com
Subject: Re: [time-nuts] FE-5680A Voltage tolerance

When I got my first unit I hooked it up to my protoboard power supply which
is rated at 15 volts 0.5 amps and 5 volts 1 amp.  I was annoyed that it took
about
10 minutes to lock up until I realized the 15 volt supply was down near 11.5
volts.  Oops.  Substituting my small B&K bench supply (good for up to 3
amps) resulted in a lock in under a couple of minutes.  Perhaps my unit's
internal adjustments are still just about right.  It would be nice to get
the alignment procedure for the thing, but I suppose, fat chance of that.

Peter


On 1/19/2012 6:45 PM, gonzo . wrote:
> Experiment for the day.
> I thought I'd follow Dons quote and see how tolerant my unit is.
> My benchmark is at 15.5V it locks in about 3min.
> I backed off the supply to 10.8V and the lock time (from cold) is 8min.
>
> I thought this was interesting given several people report they are unable
to get a lock when running lower voltage.
>
> ian
>   		 	   		
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