On 21 Feb 2008 02:47:02 GMT Jim Yanik wrote in Message
id: :

"hr(bob) " wrote in
:

[...]


Have you swapped probes??


you shouldn't be testing/calibrating BW using probes.
you use a levelled signal generator,50ohm coax,a 50 Ohm feedthru
termination,and appropriate 50ohm attenuators.

Yup.