Audio frequencies, yes. No active components; LC only.
Scope (Tek 2465 DMS) has Z-axis input at the rear panel, but no X-axis input.
Does this kill the possibility of simple display of spectrum?
Excellent, just about what I was guessing from your original posting.
1: You don't need the Z-axis input on this. That is for driving the
brightness in relation to your input signals, don't need that.
What you want is an external X input, usually the scope generates
this by itself, with the time base controlling how fast that goes.
Sometimes it isn't obvious how to use one of your signals to drive X.
2: You have a couple of input channels in your 2465, that will do fine.
See if you can grope around the net or find an example or some kind
individual to get you a button-by-button description of how to draw
lissajous patterns on your scope. THese are the "loopy" patterns
where if you have a 3 Hz sine wave and a 2 Hz sine wave it will make
up a pattern with 3 lobes in one direction and 2 lobes in the other.
Asking for specific instructions for your scope and this display should
get you at least one good helpful answer somewhere. It has been too
long for me to be able to tell you how to do this step by step, and
I wasn't on the 2465's.
For your nice audio no-active-components want-to-see-frequency-response
you are looking for a ramp or sawtooth output from your sweep generator.
That is going to drive the horizontal part of your display. And your
substantially higher audio signal that is sweeping upwards is going to
drive your vertical part of the display. Actually it is going to be
bouncing up and down wildly but it will be scribbling on top of itself.
The amplitude of the frequency coming out of your circuit is going to
look like a bright green vertical line, the height of that line is the
frequency response you are wanting to see as you sweep across your
filter range.
I hope this helps. Toss me mail if it works out or if you can't figure
out how to do this and I'll try to help.
Email address is valid, been "dont" on the net since before there was spam!