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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 162
.
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
Factory
)
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 > Marker 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