[time-nuts] Fw: HP 5065A, no 2nd harmonic.

[cdelect at juno.com]

Jared,

A few things to try.

On the bottom of the chassis Connect a scope to A8 pin 9. You should have
a 137Hz (approx) sine wave of around 200mv P-P.

If OK on the bottom of the chassis then connect the scope to A7 TP2 AC
coupled.

In open loop and with the 5Mhz within .1Hz you should see a signal that
will vary from fundamental on each side to a 2nd harmonic when exactly on
frequency. (between .5 and 6VP-P.)

If you see it then switch to operate and see if the control voltage
reading will follow if you move the fine Quartz adjust back and forth.

If yes then the A7 2nd harmonic channel is most likely bad.

If you don't see it then measure the DC voltage at A3 TP2, it should be >
4.5VDC.

If not make sure the 5Mhz into A3 is correct (1VRMS).

What is the serial number of the mainframe?

Good Luck,

Corby