[time-nuts] 3.0GHz Channel 3 installation in Agilent 53132A Counter

Tom Knox actast at hotmail.com
Wed Mar 19 19:43:50 EDT 2014

Jim the 5 and 12.8GHz modules are the same part and the software/firmware set the upper freq limit. I assume at least the 12.8 GHz option must be unlocked/accessed most likely through the key pad. The 5GHz may be plug and play.

Thomas Knox

> From: jsrobbins at earthlink.net
> Date: Wed, 19 Mar 2014 18:00:09 -0400
> To: time-nuts at febo.com
> Subject: [time-nuts] 3.0GHz Channel 3 installation in Agilent 53132A Counter
> I think I may need to clarify my prior posting.
> Both old and new Channel 3 boards work fine (and read correctly) in my older 53132A counter.
> Both old and new Channel 3 boards fail to work properly in (and read 4x actual) the newer 53132A counter.
> So I think the problem is in the newer main 53132A box.
> As far as my understanding of the division ratios, I understand my error now.  Thank you Dave (and some others).
> I have done some further testing and discovered one of HP/Agilent's little tricks.  The main counter board channel 3 ribbon cable socket pin numbering does not conform to the channel 3 board ribbon cable socket numbering (they are crisscrossed).  (I can supply the shifted numbers if anyone is interested.)
> However, my search for suspected unwanted zero ohm resistors left in the new box (to set the counter up for a 5 or 12.5GHz channel 3) has resulted in no joy and only a large headache and sore eyes:(  
> Thanks everyone for trying to help here.  It was supposed to be a "plug and play" addition to my counter.  So much for the plan.
> Jim Robbins
> N1JR
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