Comparing Signals Not On The Same Screen Using Marker Delta - Keysight Technologies N9321C User Manual

Functions and Measurements
Measuring Multiple Signals
Comparing Signals not on the Same Screen
Using Marker Delta
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The analyzer will compare the frequency and amplitude differences
between two signals which are not displayed on the screen at the
same time. (This technique is useful for harmonic distortion tests.)
In this example, the analyzer's 10 MHz signal is used to measure
frequency and amplitude differences between a signal on screen,
and another signal off screen. Delta marker is used to demonstrate
this comparison.
1 Preset the analyzer:
Press Preset (With Preset Type set to DFT)
Connect the rear panel REF OUT to the front panel RF IN.
2
3 Set the center frequency, span and reference level to view only the
50 MHz signal:
Press Frequency > 50 > MHz
Press Span > 25 > MHz
Press Amplitude > 10 > dBm
4 Place a marker on the 50 MHz peak and then set the center
frequency step size equal to the marker frequency (10 MHz):
Press Peak Search
Press Marker > Marker To > To Center
Press Frequency > More > CF Step > 10 > MHz
5 Activate the marker delta function:
Press Marker > Mode > Delta
6 Increase the center frequency by 10 MHz:
Press Frequency,
The first marker moves to the left edge of the screen, at the
amplitude of the first signal peak.
FM