Remote Control Commands
R&S
®
NRP18S-xx
90
User Manual 1178.3686.02 ─ 05
8.8.4.4
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
●
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.
Sensor
Source
NRP
3-Path Diode Power Sensor
MHz to GHz, 100 pW to 200 mW (−70 dBm to +23 dBm)
SMART SENSOR TECHNOLOGY
Figure 8-8: 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 taken into
account:
●
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
If the S-parameter correction is enabled, the interaction between the complex reflection
coefficient
Γ
sensor
of the power sensor and the reflection of port
2, expressed by
s
22
, is
always taken into account, 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 8-9: Correction of interactions between the power sensor, the signal source, and the S-param-
eter device
Remote commands:
[SENSe<Sensor>:]SGAMma:CORRection:STATe
................................................................91
[SENSe<Sensor>:]SGAMma:MAGNitude
........................................................................... 91
................................................................................. 91
Configuring Basic Measurement Parameters
