Measurements
R&S
®
RTP
374User Manual 1337.9952.02 ─ 12
8.2.8 Histograms and histogram measurements
8.2.8.1 Histogram characteristics
Histograms are used to plot density of data, i.e. to display graphically how often which
signal values occur. The histogram can be based on the input signal levels (ampli-
tudes) or the timebase in a time domain measurement, or on frequencies or frequency
levels in a spectrum measurement. They are a prerequisite for histogram measure-
ments.
Depending on which data the histogram is based on, a vertical or horizontal histogram
can be selected. A vertical, or amplitude, histogram displays horizontal bars across
amplitude values. A horizontal or time/frequency histogram displays vertical bars over
time/frequencies.
You can define up to 8 histograms in a diagram, one of them is displayed. They can be
created quickly using toolbar icons, or in the "Meas" menu > "Histogram" dialog box. To
switch the histogram display, tap the required histogram area, or select it in the "Histo-
gram" dialog box. For histogram measurements, the measured histogram is selected
independently in the measurement setup.
In a histogram, the maximum count of a waveform value is assigned to the full height
(histogram peak). All other count values are displayed relative to the maximum.
The following characteristic values can be determined for histograms (illustrated for a
vertical histogram):
Automatic measurements
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