Robert -
Try using a low-frequency AC signal, as from a function generator, and
DC couple it to the 8640B FM modulator input. Depending on how much
sweep you need, I think this will work. I am pretty sure the 8640B FM
section will respond to DC.
If you have a function generator, and it generates sawtooth waves, you
can use the same signal to drive your scope.
Alternately, if you don't have a function generator, but do have a
fairly modern scope, then perhaps it has a "sweep out" signal (often on
the rear panel) that you could use to drive the 8640B FM section. The
results would probably be the same. Using DC coupling insures that low
frequency signals make it all the way through the amplifier chain in the
various instruments.
Other than not having retrace blanking, the results should look pretty
much like any sweep generator / detector combo.
- Jim, KL7CC
Robert Tellefsen wrote:
I have a nice 8640, which is an excellent signal generator.
However, I'm interested in sweeping filters with it.
Does anyone know if there is a way to get it to sweep,
or are we stuck with manual tuning?
Thanks and 73
Bob N6WG
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