[time-nuts] Re: Software for Agilent 58503a

[Bob Camp]

Hi

Simple check:

Let the unit warm up for a while ( > 30 minutes, 2 hours would be better).

Put a frequency counter on the output of the 10811.

Short the EFC to ground. 

A working “GPSDO version” of the 10811 should have about +/- 1 ppm of tune range. With a shorted EFC anything within a half ppm of 10 MHz should be “ok”.

Bob

> On Oct 17, 2024, at 11:00 AM, rbenward--- via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Hi Tom,
> 
> Thank you for the link, I searched and searched but I got nowhere.
> 
> I haven’t played with my equipment in almost 15 years.  I need to get back into it.  For instance, you mentioned the heater.  One plug which goes to the power supply on the Z3805A has two wires disconnected.  I probably did that, or it came that way, I just don’t remember.  This unit used to work but not anymore.  Everything checks OK (status) except for the EFC.  On the Z3801A (my first GPSDO) I had taken it apart and put it back on frequency, but of course, the adjustment is with the oven taken apart down to the 10811 level.  I don’t know what the limits are, and certainly did not know where the EFC was or which way it will drift when re-assembled.  Currently both units show the EFC at the rails, so I am assuming for now, that the oscillators have drifter too far and they need a push back to the center.  I would like to convert these two paperweights back into working units.
> 
> My Trimble is working fine but I don’t know how long that will last.
> 
> I am off for three weeks, so all this effort will go on hold until I get back.
> 
> Thanks for your help, 
> 
> Bob
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