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SIGLENT
40 SDS2000X User Manual
To Select Waveform Interpolation Method
Under real-time sampling, the oscilloscope acquires the discrete sample values of the
waveform being displayed. In general, a waveform comprised of a singular dot per sample
point 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.
The interpolation method “connects all the sampled points”, to estimate the whole
appearance of the waveform. The oscilloscope can use interpolation to fill in the gaps
between points and accurately reconstruct a 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: In the adjacent sample points are directly connected on a straight line. This method
is confined to rebuild on the edge of signals, such as square wave.
Sinx/x: Connecting the sampling points with curves has stronger versatility. Sinx/x
interpolation method uses mathematical processing to calculate results in the actual
sample interval. This method involves bending the signal waveform, and allows it to
produce a more realistic shape than pure square wave and pulse. When the sampling
rate is 3 to 5 times the bandwidth of the system, the Sinx/x interpolation method is
recommended.
Figure 11: Display Type Set to Dots
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