Specifications

38 Chapter 5
Tracking Drifting Signals
Tracking a Signal
Tracking Drifting Signals
Tracking a Signal
The signal track function is useful for tracking drifting signals that
drift relatively slowly by keeping the signal centered on the display as
the signal drifts. This procedure tracks a drifting signal.
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.
Step 1. Set the source frequency to 300 MHz with an amplitude of −20 dBm.
Step 2. Set the analyzer center frequency at a 1 MHz offset:
Press
Preset, Factory Preset (if present).
Press
FREQUENCY Channel, Center Freq, 301, MHz.
Press
SPAN X Scale, Span, 10, MHz.
Step 3. Turn the signal tracking function on:
Press
FREQUENCY Channel, Signal Track (On).
Notice that signal tracking places a marker on the highest amplitude
peak and then brings the selected peak to the center of the display.
After each sweep the center frequency of the analyzer is adjusted to
keep the selected peak in the center.
Step 4. Turn the delta marker on to read signal drift:
Press
Marker, Delta.
Step 5. Tune the frequency of the signal generator in 100 kHz increments.
Notice that the center frequency of the analyzer also changes in
100 kHz increments, centering the signal with each increment.
Figure 5-2 Tracking a Drifting Signal (ESA left, PSA right)