[Test-Equipment] How to do Time interval on freq. Counter

[Paul Cianciolo]

Folks,

I have a freq counter that works great as a freq. counter but I would like
to try the Time interval function.

I have 2 10Mhz osc. that have a difference of about 20 Hz.  When connected
to the HP 5326A and I look at the TI between them
it shows 14 nanosec???

when I input A & B from the same 10 Mhz clock it still shows 14 Nanosecs.

The TI number differs on when the freq of the oscillator is changed.

Do I not understand what is going on?   tThe assumption here is that if both
signals are same freq. the diff should be zero??

The period works ok and is on the money.

Can anyone point me to a refence on how this is supposed to work?

Thank you

PaulC

W1VLF