User Manual

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
306User Manual 1178.3370.02 ─ 09
7.4.3 Keeping the Center Frequency Stable - Signal Tracking
If the signal drifts on the display but you want to keep the center frequency on the sig-
nal peak, the center frequency can be adjusted automatically using signal tracking. In
this case, the signal trace is surveyed in a specified bandwidth around the expected
center frequency. After each sweep, the center frequency is set to the maximum signal
found within the searched bandwidth. If no maximum signal above a defined threshold
value is found in the searched bandwidth, the center frequency remains unchanged.
The search bandwidth and the threshold value are shown in the diagram by red lines
which are labeled as "TRK".
Signal Tracking
Access: "Overview" > "Frequency" > "Signal Tracking" tab
Defines the settings for signal tracking. These settings are only available for spans > 0.
For more details see Chapter 7.4.3, "Keeping the Center Frequency Stable - Signal
Tracking", on page 306.
If activated, after each sweep, the center frequency is set to the maximum level of the
specified "Signal Track Trace" found within the searched "Tracking Bandwidth".
If the signal level does not pass the "Tracking Threshold", the center frequency is not
changed.
Remote command:
CALCulate<n>:MARKer<m>:FUNCtion:STRack[:STATe] on page 767
CALCulate<n>:MARKer<m>:FUNCtion:STRack:BANDwidth on page 767
CALCulate<n>:MARKer<m>:FUNCtion:STRack:THReshold on page 768
CALCulate<n>:MARKer<m>:FUNCtion:STRack:TRACe on page 768
Frequency and Span Configuration