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SDS1000X-E&SDS1000X-U User Manual
47
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pan and zoom the 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 using some points to calculate the whole appearance of the
waveform. For real-time sampling interpolation method is used, even if the
oscilloscope in a single captures only a small number of sampling points. The
oscilloscope can use interpolation method for filling out 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: In 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 stronger versatility.
Sinx interpolation method uses mathematical processing to calculation results
in the actual sample interval. This method bending signal waveform, and
make it produce more realistic regular shape than pure square wave and pulse.
When the sampling rate is 3 to 5 times the bandwidth of the system.
Recommended Sinx/s interpolation method.
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