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IM 760201-01E
Features
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App
Index
Note
• Waveform sampling data and waveform display data (the number of displayed points
on the screen)
Waveform sampling data and waveform display data are both measured waveform data, but
they differ as described below.
Waveform sampling data: Data derived through A/D conversion of the input signal
The WT500 A/D conversion rate is approximately 100 kS/s. Therefore, if the data update
rate is set to 1 s, the number of data points sampled from a single input signal in a single
measurement is approximately 100000 (see the figure below). Waveform sampling data is
also called acquisition data or raw wave data.
Waveform display data: Waveform data displayed on the WT500 screen (1002 points)
When displaying waveforms on the WT500, data points are displayed in horizontal rasters
(along the time axis). The number of rasters is 501. Each raster contains two points of
waveform display data. The two data points are the maximum and minimum values of the
waveform data in each raster. Therefore, the number of waveform display data points (the
number of points displayed on the screen) for a single input signal is 1002.
Extraction of waveform display data from waveform sampling data (p-p compression)
This example assumes that a 2-Hz sine wave is measured at a data update rate of 1 s.
To display this waveform on the WT500 screen, the number of data points is converted
from approximately 100000 to 1002 (501 pairs of maximum and minimum values). Thus,
two points (a pair) of waveform display data are derived from approximately 200 points
of waveform sampling data. This conversion is called p-p (peak-peak) compression. The
compression rate of p-p compression varies depending on the data update rate and the
horizontal scale (time axis) of the WT500 waveform display.
501 rasters
Number of data points:
1002 (501 pairs)
0 500
Time axis
Waveform sampling data
Waveform display data
(WT500 screen)
p-p compression
Compresses approximately 200 points of
waveform sampling data to 2 points
(Extracts the maximum and minimum
values and draws them in each raster)
A/D-converted data
1 s
Number of data points:
Approx. 100000
With display
interpolation
on
Vertical axis
2.7 Waveform Display
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