Digital BW Limit
Digital bandwidth limit is a low-pass filter that removes high-frequency noise
from the waveform. Digital bandwidth limit reduces the bandwidth of the
oscilloscope to the current sample rate divided by 20. Digital bandwidth limit
improves the vertical resolution of the oscilloscope by reducing both the
noise floor in the oscilloscope and any noise riding on the input signal.
•
It is available in the real time sampling mode only.
•
It is an FIR filter that approximates a Gaussian response.
•
It affects channel waveform data only (not available on functions or
memories).
Interpolate
Interpolate is a finite impulse response (FIR) digital filter that makes the best
possible reconstruction of the waveform. This reconstruction is done by
using digital signal processing (DSP) to add data points between the acquired
data points. The interpolated data points are used in calculating
measurement results, which usually improves the accuracy of your
measurements.
The bandwidth of the FIR filter is
F
s
4
Figure 3-2 shows a single-shot acquisition of a rising edge. Interpolate is
turned off, so all you see on the display is a series of dots. However,
figure 3-3 shows the same rising edge, except that interpolate is turned on.
Interpolate gives you a better sense of what the actual waveform looks like.
Acquisition Menu
Digital BW Limit
3–6
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