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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