6 Activate two traces:
Press [
Shift
], [
A
](twoActiveTraceLEDsarenowturnedon)
7 Turn on marker coupling and zero the offset marker on the carrier:
Press [
Marker
], [
couple mkrs on
],
Press [
Shift
], [
Marker
] to place the marker on the carrier peak,
Press [
Shift
], [
Marker⇒
] to zero the offset marker.
8 Use the search marker to measure the phase of the two largest sidebands
relative to the carrier:
Press [
Marker Search
], [
next peak
], and note the phase displayed for the lower trace.
Press [
next peak
] again and note the phase.
The phase values vary with each sweep but for an AM signal the average
phase of the sidebands is equal to the carrier phase.
Measuring Relative Phase
4-3
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