Remote control commands
R&S
®
NRPxxP
80User Manual 1179.5760.02 ─ 02
8.7.4.2 Offset corrections
The offset accounts for external losses by adding a fixed level offset in dB.
The attenuation of an attenuator located ahead of the power sensor (or the coupling
attenuation of a directional coupler) is considered with a positive offset. That means
the power sensor calculates the power at the input of the attenuator or the directional
coupler. A negative offset can be used to correct the influence of an amplifier connec-
ted ahead.
Using S-parameters instead of a fixed offset allows more precise measurements,
because the interaction between the power sensor and the component can be consid-
ered. See also Chapter 8.7.4.3, "S-parameter correction", on page 80.
Remote commands:
SENSe<Sensor>:CORRection:OFFSet.............................................................................. 80
SENSe<Sensor>:CORRection:OFFSet:STATe.................................................................... 80
SENSe<Sensor>:CORRection:OFFSet <offset>
Sets a fixed offset that is added to correct the measured value.
Parameters:
<offset> Range: -200.00 to 200.00
*RST: 0
Default unit: dB
SENSe<Sensor>:CORRection:OFFSet:STATe <state>
Enables or disables the offset correction.
Parameters:
<state> *RST: OFF
Example:
CORR:OFFS:STAT ON
8.7.4.3 S-parameter correction
S-parameter correction compensates for the losses and reflections introduced by a
component — such as an attenuator, directional coupler, or matching pad — that is
attached to a power sensor. Using S-parameters instead of a fixed offset increases
measurement accuracy by accounting for the interaction between the power sensor
and the component. It shifts the reference plane of the power sensor from its RF con-
nector to the input of the device that is being applied externally.
All R&S NRPxxP power sensors allow compensating for the influence of any 2-port
device between the signal source and the power sensor input. As a result, the firmware
can calculate the power that the signal source actually delivers. Examples of such 2-
port devices include attenuators, matching pads, minimum-loss pads and waveguide
adapters. One precondition for such compensation is that you provide a complete set
Configuring basic measurement parameters
To Next Page
Loading...
