T3DSO2000A Manual. Page 43
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X: Linear interpolation, the simplest way of interpolation, connects two original points
with a straight line.
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Sinc: Sin(x)/x interpolation, the original point is interpolated according to the
Nyquist reconstruction formula, which has a good time-domain recovery effect
for sine wave. But for step signals/fast rise times, it will introduce false overshoot
due to the Gibbs phenomenon.
X Interpolation
Sinc Interpolation
Acq mode
-- "Fast" is the default setting. The T3DSO2000A provides a very high
waveform update rate in fast mode. "Slow" mode will slow down the waveform update on
purpose.
Resolution
-- The vertical resolution. "8-bits" is the default setting. In "10-bits" mode, the
vertical resolution is 4x better, while the bandwidth is limited to about 100 MHz.
14.2.2 Acquisition
The acquisition mode is used to determine how to acquire and process the signal.
Normal
: The oscilloscope samples the signal with an equal time interval. For most
waveforms, the best display effect can be obtained using this mode.
Peak
: Peak detect mode. The oscilloscope acquires the maximum and minimum values
of the signal within the sample interval so that the peak (maximum – minimum) in the
interval is obtained. This mode is effective to observe occasional narrow pulses or spurs
with a low sample rate, but the noise displayed is larger. In peak mode, the oscilloscope
will display all pulses with a pulse width longer than 400 ps.
In the following example, a narrow pulse sequence with a pulse width of 3.4 ns and a
period of 200 Hz is sampled at 2 MSa/s sample rate in normal mode and peak mode. As
we can see, because the sample interval (500 ns) is much larger than the pulse width
(3.4 ns), it is difficult to capture the narrow pulses in normal mode, but peak mode can
ensure that each pulse is captured.
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