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11-5
IM WT5000-01EN
Difference between Waveform Sampling Data and Waveform Display Data
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 A/D conversion rate of this instrument is approximately10 MS/s. Therefore, if the data update interval
is set to 1 s, the number of data points sampled from a single input signal in a single measurement is
approximately 10 000 000 (see the figure below). Waveform sampling data is also called acquisition data
(Acquisition Data) or raw wave data (Raw Wave Data).
• Waveform display data: Waveform data displayed on this instrument’s screen (2002 points)
When this instrument displays waveforms, data points (of waveform display data) are displayed in horizontal
rasters (along the time axis). The number of rasters is 1001. 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 2002.
p-p Compression
p-p compression is the compression method used to derive waveform display data from waveform sampling
data. For example, if a 2-Hz sine wave is measured at a data update rate of 1 s, to display this waveform, this
instrument converts the number of data points from approximately 10 000 000 to 2002 (1001 pairs of maximum
and minimum values). Thus, two points (a pair) of waveform display data are derived from approximately 10000
points of waveform sampling data. This conversion is called p-p (peak-peak) compression. The compression
ratio of p-p compression varies depending on the data update interval and the horizontal scale (time axis) of the
waveform display.
1001 rasters
Number of data points:
2002 (1001 pairs)
0
1000
Time axis
Waveform sampling data
Waveform display data (WT screen)
p-p compression
Compresses
approximately
10000 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. 10 000 000
With display interpolation on
Vertical axis
11 Graph Display