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22.3. Term interpretation
Nyquist frequency: The highest frequency that any Real Time Digital Oscilloscope can measure is exactly
half of the sampling rate under the condition of no mistakes, which is called Nyquist frequency. If
under-sampling occurs when the frequency sampled is higher than Nyquist frequency, "False Wave"
phenomenon will appear. So pay more attention to the relation between the frequency being sampled and
measured.
NOTE:
In FFT mode, the following settings are prohibited:
1.
Window set;
2.
change source channel (in CH1 Setup or CH2 Setup menu);
3.
XY Format in DISPLAY SET;
4.
"SET 50%" (the triggering level at the vertical point of signal amplitude) in Trigger setting;
5.
Autoscale.
23. Application of VERTICAL POSITION and VOLTS/DIV Knobs
1.
The VERTIVAL POSITION knob is used to adjust the vertical positions of the wave forms of all Channels
(including those resulted from the mathematical operation).
The analytic resolution of this control knob changes with the vertical division.
2.
The VOLTS/DIV knob is used to regulate the vertical resolution of the wave forms of all channels
(including those obtained from the mathematical manipulation), which can determine the sensitivity of the
vertical division with the sequence of 1-2-5. The vertical sensitivity goes up when the knob is rotated
clockwise and goes down when the knob is rotated anticlockwise.
3.
When the vertical position of the channel wave form is adjusted, the screen shows the information
concerning the vertical position at the lower left corner (see Fig. 31).
Fig. 31 Information about Vertical Position
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