User manual

Measurements
R&S
®
RTO
141User Manual 1316.0827.02 ─ 06
Table 5-7: Spectrum measurement types
Meas. type Description/Result
1 Channel power Power integrated over the sample values defined by a center frequency and
a bandwidth; based on a defined impedance; the result is given in mW
2 Occupied bandwidth From the defined center frequency, symmetric sample value pairs to the left
and right are integrated until a user-defined percentage of the total power is
reached; the occupied bandwidth is the difference between the frequencies
at which the requested power was reached
3 Bandwidth n dB down Bandwidth; the samples to the left and right of the peak value are
analyzed until the n dB threshold is exceeded; the frequencies at which the
threshold is exceeded define the limits of the requested bandwidth
4 Total harmonic distor-
tion
Power sum of the harmonic waves divided by the power of the fundamental
wave:
1
2
P
P
THD
n
n




5.2.2 Performing Automatic Measurements
Default measurements are performed simply by tapping the "Measurement" icon on the
toolbar or by pressing the MEAS key. In order to configure more complex or additional
measurement types, setup dialog boxes are available.
Up to eight automatic measurements can be configured and performed simultaneously
with the data acquisition; the results are displayed in a result box.
From the result box, the settings dialog box can be opened using the
icon.
The measurement results can be displayed in a result box, in a minimized result icon on
the signal bar, or as table in a separate diagram area. For details, see "Displaying results"
in the "Getting Started" manual.
The results of an optionally connected environment sensor can also be taken into con-
sideration in the results display of the measurement.
To display measurement information in the diagram
You can display auxiliary lines in the source waveform to determine how a measurement
result was obtained. Such lines include gate areas, reference levels or intermediate result
lines, such as the signal thresholds for rise and fall time measurements.
1. From the "Meas" menu, select "Setup", or press the MEAS key to open the "Mea-
surement" dialog box.
2. Select the "Gate/Display" tab.
3. Select the tab for the measurement you want to configure.
Automatic Measurements