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Chapter 5 Vertical System
77
5.4.1 Set Channel Coupling
Tap the icon under “Coupling Mode” and select “DC”, “AC” and “GND” channel coupling modes in the pop-up
box.
DC: DC coupling. Both the DC component and the AC component of the measured signal can pass, and can be
used to view waveforms as low as 0 Hz without large DC offset.
AC: AC coupling. Measured DC signal is blocked, and only the AC component can be allowed to pass, and used to
view waveforms with large DC offsets.
GND: Internal input ground, disconnecting from external input.
The oscilloscope is connected to the square wave signal with a frequency of 1KHz, an amplitude of 2V and an
offset of 1V. The waveforms of the channel couplings of DC, AC, and GND are shown in Figures 5-7, 5-8, and 5-9.
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