Remote control commands
R&S
®
NRPxxS(N)
111User Manual 1177.5079.02 ─ 15
9.8.4.4 S-gamma corrections
Using the complex reflection coefficient, you can determine the power P delivered by
the signal source with considerably greater accuracy.
The coefficient of the signal source Γ
source
is defined by its magnitude and phase:
●
[SENSe<Sensor>:]SGAMma:MAGNitude
●
[SENSe<Sensor>:]SGAMma:PHASe
The complex reflection coefficient Γ
sensor
of the sensor, which is also required for the
correction, is prestored in the calibration data memory for many frequencies.
NRP
3-Path Diode Power Sensor
MHz to GHz, 100 pW to 200 mW (−70 dBm to +23 dBm)
SMART SENSOR TECHNOLOGY
Sensor
Source
Figure 9-7: Correction of interactions between the power sensor and the signal source
If the gamma correction is performed in combination with an S-parameter correction
([SENSe<Sensor>:]CORRection:SPDevice:STATe ON), the following is consid-
ered:
●
Interaction of the signal source with the S-parameter device
●
Input of the power sensor, depending on the transmission, expressed by the term
s
12
s
21
The interaction between the complex reflection coefficient Γ
sensor
of the power sensor
and the reflection of port 2 is expressed by s
22
, see Figure 9-8. If the S-parameter cor-
rection is enabled, this interaction is always considered, regardless whether gamma
correction is performed or not.
Sensor
Source
S
21
S
12
S
22
S
11
NRP
3-Path Diode Power Sensor
MHz to GHz, 100 pW to 200 mW (−70 dBm to +23 dBm)
SMART SENSOR TECHNOLOGY
Figure 9-8: Correction of interactions between the power sensor, the signal source, and the S-param-
eter device
Remote commands:
[SENSe<Sensor>:]SGAMma:CORRection:STATe..............................................................112
[SENSe<Sensor>:]SGAMma:MAGNitude......................................................................... 112
[SENSe<Sensor>:]SGAMma:PHASe................................................................................112
Configuring basic measurement parameters
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