8-4
IM 701210-05E
8.2 Setting the Display Interpolation Method
• When the Area Is Not an Interpolation Area
If interpolation is set to Sine or Line, the instrument draws lines between points that
are aligned vertically. If the number of data points is greater than or equal to 2002, P-
P compression is performed (maximum and minimum values are determined at
certain intervals), and two points are displayed on a single vertical line (1 raster).
Interpolate OFF Sine/Line:
Setting the Number of Data Points to Be Used for Waveform Display: Decimation
When the area is not an interpolation area on the T-Y waveform display and Interpolation
is set to Sine or Line, the aforementioned P-P compressed values are displayed.
However, if Interpolation is set to OFF or if X-Y waveforms are being displayed, the
acquisition data is decimated and data that has been picked up at certain intervals are
displayed.
Set the number of data points for displaying the waveform to 2k or 100k.
If 2k is selected and the record length is greater than or equal to 2 kW, the data is
decimated to 2 kW, and two points are displayed on one vertical line. If 100k is selected
and the record length is greater than or equal to 100 kW, the data is decimated to 100
kW, and 100 points are displayed on one vertical line. Otherwise, all points are
displayed.
If the number of data points per division is greater than or equal to 100 for a realtime
recorded waveform or when in roll mode, the maximum and minimum values at certain
number of data points of acquisition data are displayed using linear interpolation.
Data Interpolation and Envelope Mode
When the acquisition mode is envelope, the data is interpolated using an area regardless
of the specified interpolation method (see the following figure). This is because in
envelope mode the maximum and minimum values are determined over a certain
interval, and the data time position cannot be pinpointed.
True data
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