Rohde & Schwarz R&S SMB100B - About; NRP Power Viewer

Improving level performance
R&S
®
SMB100B
172User Manual 1178.3711.02 ─ 08
"Device ID or Sensor Name"
Displays the device identifier or the name of the R&S NRP power
sensor.
If the R&S SMB100B does not detect a connected R&S NRP sensor,
you can assign the ID or name manually.
"Serial Number"
Displays the serial number of the R&S NRP power sensor.
If the R&S SMB100B does not detect a connected R&S NRPsensor,
you can assign the serial number manually.
"Add USBTMC Sensor"
Adds a detected R&S NRP sensor connected at the USB interface to
the list of sensors, including its device ID or name and its serial num-
ber.
Remote command:
:SLISt:SCAN:USENsor on page 401
7.4.3 NRP power viewer
The R&S SMB100B features the power viewer function for measuring or monitoring
signals with R&S NRP power sensors.
7.4.3.1 About
The R&S SMB100B can perform up to four power measurements simultaneously.
Depending on the signal characteristic (CW, AM, pulsed, etc.) or the parameter to be
measured (average, peak, etc.) a suitable R&S power sensor must be used.
About the measuring principle, averaging filter, filter length, and achieving stable
results
A sensor measures the average or peak RF power of the source continuously. The
measurement results are displayed in the "NRP Power Viewer" dialog.
The power viewer function uses averaging filters for getting a stable readout.
Measurement results could be interfered, for instance, by too much noise in your
setup, by a bad suppression of harmonics or non-harmonics or when you reach the
sensitivity level of your power sensor.
Measurements are continuously repeated in a predefined time window. The measure-
ment result is obtained by averaging the measured values for the last 2N time win-
dows. This approach is referred as a two-step averaging process.
The factor of 2 in the formula arises because the output signals from the microwave
detector are chopped at the same rate as the time windows to suppress low-frequency
noise. An independent measured value can only be obtained from two consecutive val-
ues.
Using power sensors