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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 interpolation to “connect the dots” on the displayed
waveform.
Interpolation is a processing method to “connect all the sampling points” to
reconstruct an accurate waveform, the interpolation method can fill out the gaps
between points.
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 on a straight line. This
method is only confined to rebuild on the edge of signals, such as square
wave.
Sinx/x: Connecting the sampling points with curves has better versatility.
Sin(x)/x interpolation method uses mathematical processing to calculate
results in the actual sample interval. This method more closely replicates more
realistic shapes than pure square waves and pulses. When the sampling rate is
3 to 5 times the bandwidth of the signal, sinx/x is the recommended
interpolation method.
Figure 12 Display in Dots
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