User Manual of PDS Series Oscilloscope
30
the oscilloscope acquisition mode to average.
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
：
While FFT mode is turned on,
DO NOT USE THESE SETTINGS:
1)
Horizontal window setting.
2)
Change source channel in CH1/CH2 Setup menu
3)
Turn on XY Format
4)
Trigger control “SET 50%”
5)
Auto-scale function
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.25).
