Owon XDS4000 Series, Руководство пользователя

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4.Advanced User Guidebook
36
waveform. To minimize the DC component, choose AC Coupling on the source
signal.
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To reduce random noise and aliased components in repetitive or single-shot
events, set the oscilloscope acquisition mode to average.
What is Nyquist frequency?
The Nyquist frequency is the highest frequency that any real-time digitizing
oscilloscope can acquire without aliasing. This frequency is half of the sample rate.
Frequencies above the Nyquist frequency will be under sampled, which causes
aliasing. So pay more attention to the relation between the frequency being
sampled and measured.
Use Vertical Position and Scale Knobs
Each of the 4 channels has a set of Vertical Position and Vertical Scale knobs. If
you want to set the vertical scale and vertical position of a channel, press CH1,
CH2, CH3 or CH4 at first to select the desired channel. Then turn the
Vertical
Position and Vertical Scale knobs to set the values.
1. The Vertical Position knob is used to adjust the vertical positions of the
selected waveforms.
The analytic resolution of this control knob changes with the vertical division.
When the
Vertical Position knob is rotated, the pointer of the earth datum
point of the selected channel is directed to move up and down following the
waveform, and the position message at the center of the screen would change
accordingly (see
Figure 4-7 ).
2. The Vertical Scale knob is used to regulate the vertical resolution of the
selected wave forms.
The sensitivity of the vertical division steps as 1-2-5. The vertical scale is
displayed at the left bottom corner of the screen (see
Figure 4-7 ).