[time-nuts] FE-5680A worked for only 5 minutes.

paul swed paulswedb at gmail.com
Fri Jan 20 14:37:19 EST 2012


Yup after things get settled those are the right currents.
So try the other and see what happens at the higher voltage.
However if it should happen to work you have a very marginal unit.
I would contact the seller asap or skip the test and just ask for a return.
Regards
Paul.

On Fri, Jan 20, 2012 at 2:09 PM, Paul F. Sehorne <paul at sehorne.org> wrote:

> I powered up the second unit. It has been running just fine for an hour
> now. The only difference I noted is that the initial current was only 1.4
> amp vs 1.8 on the other one. However, I set my power supply to 16.0 volts;
> no other difference. After warmup the current settled at ~700 ma and the
> 5vdc current at ~80 ma.
>
>
> On 1/19/2012 1:15 PM, Paul F. Sehorne wrote:
>
>> I received my two FE-5680As late yesterday. This morning I hooked one of
>> them up. It locked on in a couple of minutes and at about five minutes
>> quick working. There is a smell of something burnt inside. I have not
>> opened the case to investigate the damage.
>>
>> I had the unit attached to two current limited bench power supplies. One
>> power supply was set at +16.1 vdc and the other at +5.0 vdc. When the trace
>> on the scope went away I noticed the +15 vdc power supply had gone into
>> current limit mode at 2 amps. The +5 vdc current had dropped from ~80ma to
>> about ~60. Before the failure the +15 vdc supply showed ~1.8 amp during the
>> first minute or two and then dropped to ~700 ma.
>>
>> While it was working it worked fine and was very near my GPSDO in
>> frequency.  The scope trace was moving 5ns in about 20 seconds.  I got no
>> further than this when the unit stopped working.  I have not powered up the
>> second unit yet; preferring instead to contact nichegeek first.
>>
>> Paul
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