I mentioned the need to be careful with grounding in mixed-signal
circuits. This Analog Devices tutorial is a useful introduction to
the subject, for those interested:
Grounding Data Converters and Solving the Mystery of AGND and DGND
I hope this is not too OT.
I have acquired a 3.0GHz original Channel 3 board for my Agilent 53132A
counter. When installed, it reads four times (4x) the actual frequency.
I'm wondering if anyone has any experience with such an installation and can
point me to some setup item or zero ohm
On 2014-03-18 12:19, James Robbins wrote:
I hope this is not too OT.
I have acquired a 3.0GHz original Channel 3 board for my Agilent 53132A
counter. When installed, it reads four times (4x) the actual frequency.
I'm wondering if anyone has any experience with such an installation and can
point
Hi Jim
According to the schematic in the 53132A service manual and the datasheet
for the MB510 prescaler, the option 030 board is hard wired for a division
ratio of 1/128, and that's the lowest division ratio shown for that
prescaler.
I've not fitted one of the original HP boards but
I think the solution will be in the firmware. It must be factory set so default
is the 5GHz C channel option. The 12GHz option is the same part as the 5GHz
sampler with a different firmware lock.
Best Wishes;
Thomas Knox
From: jsrobb...@earthlink.net
To: time-nuts@febo.com
Date: Tue, 18
Further checking the service manual indicates that the main board treats
pins 9 and 10 of the ribbon cable as CH3code1 and CH3 code2 respectively so
perhaps it's using these as identifiers and it might be worth checking that
those signals are as expected. The prescaler board schematic shows
Jim,
You were looking for a 0 Ohm resistor.
Sometimes HP did not, in fact, insert a 0 Ohm resistor component in later
revs of some PCBs. They just added the default 0 Ohmers in etch, between
two vias. Then, if someone wanted to open the link, the etch was cut. I
guess it saved a couple of
Thanks everyone for the thoughts.
Nigel, I am not seeing the references to pin 9 connected to +12 and 10 to
ground on the documentation I have. Perhaps you could send along your
component level service manual. Address is jsrobb...@earthlink.net. Many
thanks.
Jim
N1JR
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