Data and file management
R&S
®
RTE
494User Manual 1326.1032.02 ─ 20
The measurement export saves results in two files. The *.Wfm.* file contains data
values, and the other file is the header file.
The header file contains:
●
Source waveform of the measurement
●
Measurement scale
●
Export type = Histogram, Long term or Track
●
Exported measurement
●
Histogram range: XStart, XStop, YStart, YStop
The range is only relevant for export type = histogram. The measurement axis is
the X-axis, which can be a horizontal or vertical axis depending on the histogram
mode.
Long-term measurements: The *.Wfm.* file contains one value or value set for
each long-term measurement point. The maximum number of points is defined in the
"Horizontal scaling" dialog box.
●
If statistics are disabled, the current result of the main measurement is written - one
double value per long-term point.
●
If statistics are enabled, seven values for each long-term point are saved:
– Upper peak
– Lower peak
– RMS
– Standard deviation
– Average
– Event count per point: number of measurement results that creates one long-
term point
– Waveform count per point: number of waveforms included in one long-term
point.
Measurement histogram: The *.Wfm.* file contains 1000 absolute or relative histo-
gram values.
Data conversion of measurement histogram data:
Using the header data, you can calculate the measurement value to which a histogram
value belongs:
MeasValue = (XStop - XStart) / 1000 * HistogramValueNumber + XStart
Example: The 273rd histogram value is 0.491749. That means, the relative frequency
of the measurement value 0.1246 V is 0.491749.
XStart 0.07 V
XStop 0.27 V
HistogramValueNumber 273 (number of the row in a CSV file)
MeasValue (0.27 - 0.07) / 1000 * 273 + 0.07 = 0.1246 V
Waveform data and results
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