Keysight M9383B Measurement Manual page 17

Basic Measurements
Making Measurements
3. Use makers to measure sideband power relative to the center frequency
4. Select Peak Search > Next Peak Right until the marker is at the next
M9383B/84B Measurement Guide
by selecting Peak Search > Settings, then set Mark Mode to Delta.
highest peak.
The Delta Marker should be approximately –12 dB for 50% AM.
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