4.Advanced User Guidebook
DC component or offset can cause incorrect magnitude values of FFT waveform. To
minimize the DC component, choose AC Coupling on the source signal.
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
The 4 channels use the same 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
4-1).
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 4-1).
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