Hi Colin,
All the 5313x counter basic oscillators are indeed extraordinarily poor,
and I've always assumed that their only purpose was to demonstrate that the
unit was basically functional.
A couple of years ago I upgraded a 53132A with serial prefix 3546 from
firmware version 3403 to 4613, just a straight replacement without any
problems so I would expect that your upgrade should have worked ok.
The devices I used were Motorola M29F010CF-90 and I've seen confirmation
from another user that 29F010-120ns should also work ok.
If it's any help I can send you a copy of the firmware files I used.
They came from EEVblog with comments that they were copied from HP
originals supplied in 2010.
Regards
Nigel
GM8PZR
I recently acquired an older HP 53132A frequency counter offeBay. It did
not come equipped with an option oscillator. The standaloneperformance of
the existing oscillator is extraordinarily poor although thecounter works
well running off my house standard. I decided to update theversion 3703
memory to version 4613 which I have installed on my newer Agilent 53132A.The
serial number prefix for the eBay counter is 3736A so I assumed that
theupgrade would work based on the HP assembly – level service guide that I
have.
When I installed a freshlyprogrammed set of 4 ROM’s the counter would not
power up. The fan ran butnothing else. When I re-installed the 3703 chips
everything returned to normal.Is there a hardware difference between the older
and the newer HP/Agilent boards or am I missing something else?
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