"Wes Stewart" wrote in message
...
On Mon, 4 Oct 2004 16:45:31 -0500, "John Smith"

If I remember that correctly the '3200 is nothing but a p-p oscillator
and a waveguide-below-cutoff probe. If your VVM reference probe
readings are changing much between frequencies and/or
calibration/measurement, try a 6 or 10 dB pad right on the generator
output and see what happens.


The 3200B is the oscillator they use in the HP AN 77-3 you sent to me. I'm
using it the same way they did except for the stretcher and a Narda (rather
than HP) coupler. However, I'll try to run a test and determine how much
difference there is using a pad.


When you're calibrating using a short, the source Z has really got to
be nailed down.

Wes


Thanks.

John