User manual

Measurements
R&S
®
RTO
151User Manual 1316.0827.02 ─ 06
7.
Optionally, define statistics settings for the long-term measurement, as described in 
chapter 5.2.2.9, "Compiling Measurement Statistics", on page 151.
8. Tap the "State" icon to enable the long-term measurement.
The measurement is performed until the defined number of measurement points have
been generated. The display is adapted as the waveform data changes in time.
5.2.2.9 Compiling Measurement Statistics
Statistics can be compiled for all measurement types, and also for long-term measure-
ments. If enabled, statistics for the measurement are included in the result box, see 
chapter 5.2.1, "Measurement Types and Results", on page 129.
In order to obtain meaningful results, it may be useful to configure specific measurement
settings.
Useful measurement settings:
●
"Multiple measurement" on the "Gate/Display" tab: the measurement result is not only
determined once within one acquisition, but repeatedly, if available; this provides a
larger basis for statistical evaluation
●
Reference/signal levels: configuring user-defined levels may compensate for irregu-
lar data, see chapter 5.2.2.5, "Configuring Reference Levels", on page 146
●
Gate areas: restricting the waveform range for measurement can eliminate irregular
data, see chapter 5.2.2.7, "Using Gate Areas", on page 150
●
Defining a "Signal threshold" for amplitude vs. time measurements or a "Noise
Reject" value for spectrum measurements can eliminate noise from the evaluation
See "Signal threshold" on page 163 and "Noise reject" on page 168.
To enable statistics
1. From the "Meas" menu, select "Setup" to open the "Measurement" dialog box.
2. Select the tab for the measurement you want to configure.
3. Tap the "Statistics" icon.
To configure long-term statistics compilation
1. From the "Meas" menu, select "Setup" to open the "Measurement" dialog box.
2. Select the tab for the measurement you want to configure.
3. Select the "Long Term/Statistics" tab.
4. Define whether the statistics are to be reset after a defined period of time or number
of acquisitions (waveforms), or not at all.
Resetting the results after a defined period of time allows you to evaluate time-
dependent behavior during the measurement, and avoids constantly rising maximum
or constantly falling minimum values till the end of the measurement.
If you select the "Time" reset mode, define a "Total measurement time" in the long-
term measurement settings.
Automatic Measurements