[time-nuts] 58503A alarm light on, but :SYSTEM:STATUS? indicates all is ok

Chuck Harris cfharris at erols.com
Wed Apr 1 12:39:12 EDT 2015

I can't help but notice that you have several of these entries:

Log 067:20150101.00:00:11:  5V is out of tolerance, value: 5.52
Log 068:20150101.00:00:11:  15V is out of tolerance, value: 19.46

I think you better look into them before anything else.

-Chuck Harris

Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
> Yesterday (31st March 2015) the "GPS lock" light of my 58503A went out
> and the "Holdover" light came on. The Alarm LED was *not* on. It had
> been like this for an hour or more. I removed the N connector, could
> see there was 5V DC on the antenna, and a visual inspection of the
> antenna cable did not give me any cause for concerns.  I decided to
> power cycle it. Anyway, it came back up, quickly achieved lock, and
> I'd rather hoped it was just a glitch, and that was the end of it. NO
> Today I notice the GPS lock light is on, Holdover is off, but the
> alarm LED is on. This is quite a different set of LEDs to yesterday.
> This time I connected the GPS receiver to a computer, to try to find
> out what was up, and are confused in that the status appears to be ok,
> yet the alarm is on. The log does not indicate why the alarm light
> should be on. (I have had it come on before, immediately after power
> up, when it indicated the power supplies were out of regulation,
> although I've never managed to observe this on a peak holding DVM, so
> I am not convinced the power supply was the cause.) But the unit has
> been stable for quite a while, yet the alarm is on, but nothing in the
> log indicates a problem.

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