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Remote control commands
R&S
®
NRPxxA(N)
91
User Manual 1177.6017.02 ─ 08
9.8.3.2
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 sensor (or the coupling attenua-
tion 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 connected 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
Remote commands:
[SENSe<Sensor>:]CORRection:OFFSet
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[SENSe<Sensor>:]CORRection:OFFSet:STATe
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[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
Manual operation:
See
[SENSe<Sensor>:]CORRection:OFFSet:STATe
<state>
Enables or disables the offset correction.
Parameters:
<state>
*RST:
OFF
Example:
CORR:OFFS:STAT ON
Manual operation:
See
9.8.3.3
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 NRPxxA(N) 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