[time-nuts] another Ebay mixup, 5370
Dr Bruce Griffiths
bruce.griffiths at xtra.co.nz
Sun Jun 10 17:53:14 EDT 2007
SAIDJACK at aol.com wrote
> There are so many trimmer caps inside that for sure I am not going to move a
> single one of 'em :)
> Then again I get <50ps jitter with 8.2 readings per second using the
> external Ref input, so maybe I should be content with that. That's a lot better than
> my 53132A.
> Thanks again everyone for your useful hints!
Most of these trimmer caps are on the 200MHz frequency multiplier board.
With a spectrum analyser, a suitable probe and a ceramic tuning wand,
those trimmer caps on the frequency multiplier board should be very easy
to adjust correctly by following the documented procedure in the manual.
There is also a single trimmer capacitor on each interpolator assembly.
Adjusting these along with the symmetry, anticoincidence, and quiescent
balance pots on each interpolator assembly requires somewhat more
equipment and expertise.
More information about the time-nuts