[time-nuts] strange hp 5345A option C19
GandalfG8 at aol.com
GandalfG8 at aol.com
Wed Aug 21 17:15:53 UTC 2013
Hi Luca
There are other items of HP equipment fitted with Ref Out and Ref In
terminals joined by an external link, with the intention that the link is
removed to connect an external standard to the Ref In terminal, but in a "normal"
5345A the external reference is used to phase lock the internal oscillator
which means that the unit can't work from an external reference if the
internal 10MHz oscillator has been removed.
However, I found some time ago that it is possible, just by fitting a
single link internally, to drive the counter via an external reference even if
the internal standard has been removed so I'm guessing that the internal
standard on this one might have been removed at some time and a previous
owner has fitted a non original internal standard with a similar provision to
bypass the normal arrangement.
It should be fairly easy to check just by looking to see if the original
HP oscillator is still fitted or whether a different one has been added.
Whether or not this relates to the Option C19 I don't know.
Regards
Nigel
GM8PZR
In a message dated 21/08/2013 17:00:21 GMT Daylight Time, iw2lje at gmail.com
writes:
Dear all,
I have bought an HP 5345A. It’s ok and I’m very glad. On the rear
panel it is wrote "OPTION C19" (a little bit strange!) and there are
two additional BNC installed on the little panel normally used to
place the HPIB connector when present.
These 2 BNCs are named REF OUT and REF IN and there is a jumper cable
that connects the output to the input.
It seems to be a modification made by some user (very strange: I can’t
understand why to place an extra auxiliary bypass for the 10 MHz
reference).
Do you have an idea about this strange modification and about the
strange option C19? Could it be a custom option? Could the option C19
and the 2 BNC for the reference be related?
Thanks
Bye
Luca – IW2LJE – Milano – Italy
_______________________________________________
time-nuts mailing list -- time-nuts at febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
More information about the Time-nuts_lists.febo.com
mailing list