Keysight Technologies N9321C, User Manual

Page: 59 / 220

51
Functions and Measurements
Tracking Drifting Signals
Tracking Drifting Signals
This section provides information on measuring and tracking
signals that drift in frequency.
Measuring a Source’s Frequency Drift
The analyzer will measure source stability. The maximum amplitude
level and the frequency drift of an input signal trace can be
displayed and held by using the maximum hold function. Using the
maximum hold function you can measure and determine how much
of the frequency spectrum a signal occupies. For more information,
refer to
"Max Hold" on page 167
.
Use signal tracking to return a signal drifting in frequency to the
center of the display. The drifting is captured by the analyzer using
the maximum hold function.
1 Connect the signal generator to the analyzer
RF IN
.
2 Output a signal with the frequency of 300 MHz and amplitude of
–20 dBm.
3 Set the analyzer center frequency, span and reference level.
Press
Preset
. (With
Preset Type
of
DFT
)
Press
Frequency > 300 > MHz
Press
Span > 10 > MHz
Press
Amplitude > –10 > dBm
4 Place a marker on the peak of the signal:
Press
Peak Search
Press
Marker > Marker To > To Center
Press
Span > 1 > MHz
The signal is in the center of the display.
6 Measure the excursion of the signal with maximum hold:
Press
Trace/Det > Max Hold