[time-nuts] HP 5371/2 error

[Magnus Danielson]

Mark Sims wrote:
> Basically it means the unit has lost the battery backup to the calibration memory.   
>
> The cure is a rather simple calibration step.  On the 5372A you input a 60 mV 10KHz sinewave and perform Test 25.
>
> The adjustment is also called "Maximum Hysteresis" 	
It also tells you that you should replace the 3,6V NiCd backup-battery 
on the CPU board. It's a soldered in purple battery. It will set you 
back about 15 USD or so, but considering that it fails after maybe 20 
years of life I think it is a small thing.

Then, trimming it up is fairly simple. Once you done those two steps, 
you are all set for another 20 years or so.

I've done this to both my private HP5372A (the one failure it had when I 
got it) and recently to the one at work.

I recommend doing it. Very low complexity and risk if you know what end 
of the soldering iron is the hot one.

Cheers,
Magnus