Instructions

Digital Storage Oscilloscope 20
Invert
OFF
ON
The invert function turns the displayed waveform 180
degrees, with respect to the ground level. When the
oscilloscope is triggered on the inverted signal, the
trigger is also inverted.
Coupling
 If the channel adopts a DC coupling mode, you can quickly measure the DC
component of the signal by observing the difference between the waveform and the
signal ground.
 If the channel adopts an AC coupling mode, the DC component in the signal is
filtered. By this mode, the AC component of the signal is displayed at a higher
sensitivity.
 If the channel adopts a GND coupling mode, cut off the input signal. Inside the
channel, the channel input is connected with a zero volt reference electric level.
Fine Resolution
In the fine resolution setting, the vertical scale readout displays the actual VOLTS/DIV
setting. The vertical scale changes only after you adjust the VOLTS/DIV control and set
to coarse.
Remove Waveform Display
To remove a waveform from the screen, first push the menu button to display the
vertical menu, then push again to remove the waveform. A channel waveform which is
unnecessary to be displayed can be used as a trigger source or for math operations.
2.6.2 Math Operation
The series of scope supports many math operations between analog channels
waveforms, including addition (+), subtraction (-), multiplication (*), division (/) and FFT.
You can use cursors to measure it. The contents of this chapter:
• Units for Math Waveforms
• Math Operators
• To Adjust the Math Waveform Scale and Offset
Note: If the analog channel or the math function display is truncated (waveforms do not
display on the screen completely), the resulting math will also be truncated.