Agilent Technologies E7405A User Manual
Chapter 1
27
Making Basic Measurements
Tracking Drifting Signals
Tracking Drifting Signals
The signal track function is useful for tracking drifting signals that
drift relatively slowly. To place a marker on the signal you wish to
track, use
drift relatively slowly. To place a marker on the signal you wish to
track, use
Peak Search
. Pressing
FREQUENCY
,
Signal Track
(On) will
bring that signal to the center frequency of the graticule and adjust the
center frequency every sweep to bring the selected signal back to the
center. A quick way to perform the
center frequency every sweep to bring the selected signal back to the
center. A quick way to perform the
Peak Search
,
FREQUENCY
,
Signal Track
,
SPAN
key sequence is to use the
Span Zoom
key in the
SPAN
menu.
Note that the primary function of the signal track function is to track
unstable signals, not to track a signal as the center frequency of the
analyzer is changed. If you choose to use the signal track function when
changing center frequency, check to ensure that the signal found by the
tracking function is the correct signal.
unstable signals, not to track a signal as the center frequency of the
analyzer is changed. If you choose to use the signal track function when
changing center frequency, check to ensure that the signal found by the
tracking function is the correct signal.
Tracking Signal Drift Example 1:
Use the signal track function to keep a drifting signal at the center of
the display and monitor its change.
the display and monitor its change.
This example requires a signal generator. The frequency of the signal
generator will be changed while you view the signal on the display of
the analyzer.
generator will be changed while you view the signal on the display of
the analyzer.
1.
Connect a signal generator to the analyzer input.
2.
Set the signal generator frequency to 300 MHz with an amplitude of
−
20 dBm.
3.
Set the analyzer as follows:
a.
Press
Preset
,
Factory Preset
(if present).
b.
Set the Y-Axis Units to dBm by pressing
AMPLITUDE
,
More,
Y-Axis Units,
dBm
.
c.
Set the resolution bandwidth to the spectrum analyzer coupling
by pressing
by pressing
BW/Avg
,
Resolution BW
d.
Set the center frequency to 300 MHz by pressing
FREQUENCY,
Center Freq
, 300,
MHz
.