R&S NRP-Z11/21/31/41/61/211/221 Remote Control - Commands
1137.7470.12 6.11 E-7
SENSe:FREQuency[?] 10.0e6 to 8.0e9/18.0e9/33.0e9/40.0e9/50.0e9
SENSe:FREQuency transfers the carrier frequency of the RF signal to be measured; this frequency is
used for the frequency-response correction of the measurement result. The center frequency is set for
broadband signals (spread-spectrum signals, multicarrier signals).
The query yields the set carrier frequency in Hz.
Default setting: 50.0e6 [Hz]
SENSe:FUNCtion[?] <sensor_function>
SENSe:FUNCtion <sensor_function> sets the sensor to one of the following measurement modes:
Table 6-3 Measurement modes
<sensor_function> Description of the measurement mode
"POWer:AVG"
Continuous Average
In this mode, the average power of the measurement signal is asynchronously measured within
definable time intervals (sampling windows). The width of a sampling window is set with the
SENSe:POWer:AVG:APERture
command. The measurements are performed with chopper stabilization
to obtain more accurate measurement results with reduced noise and zero offset. Therefore, a single
measurement is always performed over two sampling windows
, the polarity of the detector output signal
being reversed for the second window. By taking the difference of the output signals, the effect of the
video path on noise and zero drift is minimized. When the averaging function is a
factor determines how often the described measurement cycle is repeated.
A measurement should be started with the command INITiate:IMMediate (once) or
INITiate:CONTinuous ON (continuously), the trigger source being set to IMMediate with the
TRIGger:SOURce command (asynchronous measurement).
"POWer:TSLot:AVG"
Timeslot Average
The average power of a definable number of successive timeslots within a frame structure with equal
spacing is measured. The width of one slot must be defined with SENSe:POWer:TSLot[:AVG]:WIDTh
;
the number of slots is defined by SENSe:POWer:TSLot[:AVG]:COUNt. It is essential to define the
parameter TRIGger:DELay to ensure that the beginning of the first slot to be measured coincides with
the delayed trigger point. The measurement result is an array with the same number of elements as
timeslots. Each element represents the average power in a particular timeslot.
To minimize noise and zero offset, the measurement is performed with chopper stabilization. The
polarity of the detector output signal is therefore reversed from frame to frame. By subsequently taking
the difference of the output signals, the effect of the video path on noise and zero drift is reduced.
Time intervals that are to be excluded from the measurement can be set at the beginning and end of
each timeslot (see commands SENSe:TIMing:EXCLude:STARt and SENSe:TIMing:EXCLude:STOP).
A measurement is initiated with the command INITiate:IMMediate (once, irrespective of the number of
repetitions required for averaging) or INITiate:CONTinuous ON (continuously). The trigger source must
be set to INTernal or EXTernal with the TRIGger:SOURce command. After each occurrence of a
trigger event, the power is measured sequentially in all timeslots. Note that a trigger event must be
available for each frame.
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