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

[rbenward at verizon.net]

Hi Bob,

Sorry for the delay, I just got back from vacation.  As you suggested, I shorted the EFC input and got xxx992Hz.  Then I put 5V, 0V, and -5V on the EFC.  As you can see, it’s never going to make it, it’s just too far off (assuming and EFC range of +/-5V).  

 

I know somewhere there was post or an article about drilling a hole for the adjustment, but I just can’t find it.  I really would like to know how they dealt with not perforating the heater wrapped around the inner can.

 

Bob

 

 

5V 



 

0V & short



 

-5V



 

-----Original Message-----
From: Bob Camp via time-nuts <time-nuts at lists.febo.com> 
Sent: Thursday, October 17, 2024 4:29 PM
To: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>
Cc: rbenward at verizon.net; Bob Camp <kb8tq at n1k.org>
Subject: [time-nuts] Re: Software for Agilent 58503a

 

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 < <mailto:time-nuts at lists.febo.com> 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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