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

[J. Forster]

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 pennies.

-John

===============


> 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 9 as
> being  connected to +12V and 10 to ground.
> If you don't have access to the component level service manual let me know
> and I'll send you a copy.
>
> Regards
>
> Nigel
> GM8PZR
>
>
>
>
> In a message dated 18/03/2014 18:20:09 GMT Standard Time,
> jsrobbins at earthlink.net writes:
>
> 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  resistor I'm supposed to install.
> All that the manual says is to have it  done by the factory.  That will
> cost
> me more than the board  itself.  Many thanks.
>
>
>
> Jim  Robbins
>
> N1JR
>
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