R&S FSMR, Operating Manual

Page: 207 / 955

R&S FSMR Analyzer - Frequency and Span
1166.3363.12 4.5-5 E-1
The SIGNAL TRACK softkey switches on the tracking of a signal near the
center frequency. The signal is tracked as long it is in the search bandwidth
around the center frequency defined with
TRACK BW and above the level
threshold defined with TRACK THRESHOLD .
For that purpose
, the maximum signal is searched ( PEAK SEARCH) on the
screen and the center frequency set to this signal ( MARKER -> CENTER)
after each frequency sweep within the search bandwidth.
If the signal falls below the level threshold or jumps out of the search
bandwidth around the center frequency, the center frequency is not varied
until a signal is in the search bandwidth above the level threshold. This can
be achieved by manually modifying the center frequency, for example.
On switching on, the softkey is highlighted and the search bandwidth and the
threshold value are marked on the diagram by two vertical lines and one
horizontal line. All these lines are allocated the designation TRK.
At the same time a submenu is opened in which the search bandwidth, the
threshold value and the trace can be modified for the maximum search.
The softkey is only available in the frequency domain (span
>
0).
IEC/IEEE-bus command:
CALC:MARK:FUNC:STR OFF
The TRACK ON/OFF softkey switches on and off signal
tracking.
IEC/IEEE-bus command:
CALC:MARK:FUNC:STR OFF
The TRACK BW softkey defines the search bandwidth for
signal tracking. The frequency range is symmetrical with
respect to the center frequency.
IEC/IEEE-bus command:
CALC:MARK:FUNC:STR:BAND 10KHZ
The TRACK THRESHOLD softkey defines the threshold
value for signal detection. The value is always entered as
an absolute level value.
IEC/IEEE-bus command:
CALC:MARK:FUNC:STR:THR -70DBM
The SELECT TRACE softkey selects the trace on which
signal tracking is to be performed.
IEC/IEEE-bus command:
CALC:MARK:FUNC:STR:TRAC 1