Measurements
R&S
®
RTO6
308
User Manual 1801.6687.02 ─ 05
In addition to reference and signal levels, you can define a hysteresis for the middle
reference level and tubes for signal levels. Hysteresis is useful for measurements that
determine zero-crossings. Period, frequency, and pulse measurements are based on
hysteresis - the instrument returns results if the amplitude of the signal exceeds the
hysteresis. Thus, measurement during the transient oscillation is also possible. Tubes
define evaluation ranges for measurements that require detection of the high level or
low level. If the signal value remains within the defined tubes, it is considered to be
high or low.
Reference levels and result lines can be displayed in the diagram, see
erence levels and result lines"
8.2.4.1
Configuring reference levels
To determine reference and signal levels automatically
By default, the histogram of the measurement data is evaluated to determine the
required levels automatically. However, you can define several parameters to adapt the
evaluation to your data.
1. Open "Menu" > "Measure" > "Advanced" tab > "Reference Level" > "Levels" tab.
2. Define the "Source", the waveform for which the reference is defined. The source
can be any signal input, math or reference waveform.
3. Select "Mode" = "Auto" .
4. Define the "Signal level", the method which is used to determine the signal levels.
5. By default, the lower reference level is defined at 10% of the signal amplitude, the
middle reference level at 50% and the upper reference level at 90%. You can
select other "Relative levels" to be used for evaluation.
If default percentages do not fit, select "User defined" and enter the percentages
for the upper, middle, and lower reference levels.
The signal levels are determined by the instrument.
6. To determine the reference levels using average values from several histograms,
enable the "Histogram averaging" option and define an "Average Count" to define
how many histograms are averaged.
Averaging is not available if "Absolute peak" are selected as the "Signal level".
To determine reference levels manually
You can configure the reference levels manually as fixed absolute or relative values.
1. Open "Menu" > "Measure" > "Advanced" tab > "Reference Level" > "Levels" tab.
2. Define the "Source", the waveform for which the reference levels are defined. The
source can be any signal input, math or reference waveform.
3. Select "Mode" = "Manual" .
Automatic measurements
