To analyze a transient signal with demodulation
This procedure analyzes the frequency and amplitude variations of the
transient signal with demodulation. It assumes that the steps in “To set up
transient analysis” have been performed. If not, do so before beginning.
1. If you just finished the setup procedure, go to step 2 (don’t perform this step).
If you just finished the time gating analysis, go back to main time:
Press [
Time
], [
gate off
]
2. Turn on FM demodulation:
Press [
Instrument Mode
], [
Analog Demodulation
] (with option AYH, press
[
Instrument Mode
], [demod type], [
Analog Demodulation
], [Return]).
Press [
demodulation setup
], [
ch1 result
], [
FM
].
Press [
Pause|Single
] to simulate a transient and take data.
3. Now rescale to examine the results:
Press [
A
], [
Auto Scale
].
Press [
B
], [
Ref Lvl/Scale
], [
Y per div
], 200, [
exponent
], 3, [
Hz
].
The display should appear as shown below.
FM demodulation analysis. The bottom trace shows the frequency
variation in the transient signal. Comparing it with the time signal
in the previous figure shows that demod results are meaningless during
periods of no signal.
Characterizing a Transient Signal
3-5
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