R&S ESU Series, Руководство по эксплуатации, Страница: 136 / 855

Operating Manual 1302.6163.12 - 03 4.105
R&S ESU Instrument Functions
Analyzer Mode
STOP The STOP softkey activates the window for entering the stop frequency.
The allowed range of values for the stop frequency is:
minspan
≤
f
stop
≤
f
max
Remote command:
FREQ:STOP 2000MHz
FREQUENCY
OFFSET The FREQUENCY OFFSET softkey activates the window for entering an arithmeti-
cal frequency offset which is added to the frequency axis labelling. The allowed
range of values for the offset is -100 GHz to 100 GHz. The default setting is 0 Hz.
Remote command:
FREQ:OFFS 10 MHz
SIGNAL
TRACK The SIGNAL TRACK softkey switches on the tracking of a signal near the center fre-
quency. 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 fre-
quency 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 thresh-
old value are marked on the diagram by two vertical lines and one horizontal line. All
these lines are provided with 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).
Remote command:
CALC:MARK:FUNC:STR OFF
TRACK ON/OFF The TRACK ON/OFF softkey switches on and off signal tracking.
Remote command:
CALC:MARK:FUNC:STR OFF
TRACK BW The TRACK BW softkey defines the search bandwidth for signal tracking. The fre-
quency range is symmetrical with respect to the center frequency.
Remote command:
CALC:MARK:FUNC:STR:BAND 10KHZ
TRACK
THRESHOLD
The TRACK THRESHOLD softkey defines the threshold value for signal detection.
The value is always entered as an absolute level value.
Remote command:
CALC:MARK:FUNC:STR:THR -70DBM
f
stop
stop frequency
minspan smallest selectable span (10 Hz)
f
max
max. frequency