6. Turn on AM demodulation and examine the recovered modulation signal:
Press [
Instrument Mode
], [
Analog Demodulation
] (with option AYH, press
[
Instrument Mode
], [demod type], [Analog Demodulation], [Return]).
Press [
demodulation setup
], [
ch1 result
], [
AM
].
Press [
Auto Scale
] to scale the display information, as shown below:
The AM demodulated spectrum.
7. Examine the recovered time-domain information:
Press [
Measurement Data
], [
main time
]([
main time ch1
] in a 2-channel analyzer) to
display the time data.
Press [
Auto Scale
] to scale the display information.
Press [
Trigger
], [
trigger type
], [
internal source
] to stabilize the display.
Recovered signal is volts as a function of time.
l
The span value sets the effective sample rate (∆t) and range of allowed
RBW values.
l
The RBW value determines the record length (T).
l
The number of measured points = T/∆t.
Demodulating an Analog Signal
1-3
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