R&S FSV3000 Series - Keeping the Center Frequency Stable - Signal Tracking

Common Measurement Settings
R&S
®
FSVA3000/ R&S
®
FSV3000
364User Manual 1178.8520.02 ─ 01
Frequency Offset
Shifts the displayed frequency range along the x-axis by the defined offset.
This parameter has no effect on the instrument's hardware, or on the captured data or
on data processing. It is simply a manipulation of the final results in which absolute fre-
quency values are displayed. Thus, the x-axis of a spectrum display is shifted by a
constant offset if it shows absolute frequencies. However, if it shows frequencies rela-
tive to the signal's center frequency, it is not shifted.
A frequency offset can be used to correct the display of a signal that is slightly distorted
by the measurement setup, for example.
The allowed values range from -100 GHz to 100 GHz. The default setting is 0 Hz.
Remote command:
[SENSe:]FREQuency:OFFSet on page 888
8.3.3 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.
Frequency and Span Configuration