Improving Level Performance
R&S
®
SMA100B
168
User Manual 1178.3834.02 ─ 03
Aperture Time ← Sensor settings
If "Use Default Aperture Time > Off", defines the acquisition time per sensor.
For example, to obtain a sufficient low average value, set the aperture time exactly to
one modulation period.
Remote command:
:SENSe<ch>[:POWer]:APERture:TIMe
S-Parameter ← Sensor settings
Lists the S-Parameter correction data files retrieved for the connected power sensor.
To activate the correction data, select the corresponding file.
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 sensor and the
component. S-Parameter correction shifts the sensor's reference plane from the sen-
sor's RF connector to the input of the device that is being applied externally.
The S-Parameter table can be changed with the S-Parameters tool, provided as part of
the free R&S NRP Toolkit software. For more information, refer to the manual of the
connected R&S NRP power sensor.
Remote command:
:SENSe<ch>[:POWer]:CORRection:SPDevice:STATe
:SENSe<ch>[:POWer]:CORRection:SPDevice:LIST?
:SENSe<ch>[:POWer]:CORRection:SPDevice:SELect
Enable Logging ← Sensor settings
Activates recording of R&S NRP power sensor readings in a log file.
There is 1 log file per sensor. The log files are created automatically and filled in con-
tinuously. They are text files with predefined filename
SensLog<n>.txt
, where
<n>
indicates the connected sensor. Log files are stored on the hard disk, in the direc-
tory
/var/user/temp/SensorLogging
.
Each log file contains the measured value (2 readings when you work with peak sen-
sors), the sensor type, and the measurement time (timestamp). Logged data is not
overwritten. When a new measurement is started, the collected logging data is appen-
ded in the log file.
Check the used disc space regularly and remove log files to maintain storage capacity.
Note:
The logging function is intended for measurements with long time intervals. It is
suitable source for data reconstructions if the connection to the sensor was interrupted.
Remote command:
:SENSe<ch>[:POWer]:LOGGing:STATe
6.4.4 NRP Info Update
The "NRP Info/Update" dialog covers information on connected power sensors, like
serial number, revision state and features of the particular sensor. You can directly
update the sensor firmware.
Using Power Sensors
