[time-nuts] Modern HP5065A adjustment ideas

[cdelect at juno.com]

Poul-Henning,

Hi!

I never use the XY method in the manual.

It's much easier just to use the scope in the normal mode.

I don't try to synch the scope, just use the fine horizontal control to
give me a few cycles on the trace with it close to stationary (slow
roll).

The splitting is easy to adjust out.

One trick if you run out of range on the phase pot:

Insert a 137Hz signal thru a 10Meg resistor (see test cable described in
the manual) into A7.

Monitor the input pin to the phase detector and manually adjust the
signal generator for a peak amplitude.

This measures where the A7 bandpass filter is centered.

Now adjust the A8 modulation frequency to match the measured frequency.

This sometimes makes it much easier to adjust the phase.

I very seldom measure the SN since it's met if you have >500mV at A7TP2.

Also if you run an AD plot and you meet or exceed specs the SN is OK.

I have seen some units with a SN of 6000!

Cheers,

Corby