Keysight Technologies N9321C, User Manual

Page: 44 / 220

Functions and Measurements
Measuring Multiple Signals
36
Comparing Signals not on the Same Screen
Using Marker Delta
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
)
2 Connect the rear panel
REF OUT
to the front panel
RF IN
.
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