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Select Waveform Interpolation Method
Under real-time sampling, the oscilloscope acquires the discrete sample values of the
waveform being displayed. In general, a waveform of dots display type is very difficult
to observe. In order to increase the visibility of the signal, the digital oscilloscope
usually uses the interpolation method to display a waveform.
Interpolation method is a processing method to "connect all the sampling points", and
uses the points to calculate the whole appearance of the waveform. For real-time
Sampling, interpolation method is used, even if the oscilloscope is in a single capture
mode and only a small number of sampling points are captured. The oscilloscope can
use interpolation for filling in the gaps between points to reconstruct an accurate
waveform.
Press the Acquire button on the front panel to enter the ACQUIRE Function menu; then
press the Interpolation softkey to select Sinx/x or X.
●
X: The adjacent sample points are directly connected with a straight line. This
method is only used to rebuild on the fast edge of signals, such as a square wave.
●
Sinx/x: Connecting the sampling points with curves has greater versatility. Sinx/x
interpolation method uses mathematical processing to calculation results in
between the actual sample points. This method smooths the signal waveform,
and gives it a more realistic regular shape than straight line connected sample
points. When the sampling rate is relatively low, less than 5 times the bandwidth
of the highest frequency of the waveform, it is recommended to use the Sinx/s
interpolation method.
Figure 15 Display Type Set to Dots
User Manual 43
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