Vertical Control
41
Note:
Note:
7.4
Channel Setup
Pressing the
Channel
key to open the corresponding channel menu. As shown in figures
the following
options can be configured:
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•
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7.4.1
Channel Coupling
Coupling changes, the
channel’s
input coupling to either
AC
(alternating current),
DC
(direct current), or
GND
(ground).
DC (Direct Current)
All of the input signal frequency components are passed to the display.
DC coupling is useful for viewing waveforms as low as 0 Hz that do not have large DC offsets.
If the channel is DC coupled, you can quickly measure the DC
component of the signal by simply noting its distance from the ground.
Alternating Current
The signal is capacitively coupled. DC signal components are rejected. See the datasheet for details of the cut-off
frequency.AC coupling is suitable for observing AC signals with DC offset, such as power ripple.
AC coupling is useful for viewing waveforms with large DC offsets.
AC coupling places a 10 Hz high-pass filter in series with the input waveform that removes any DC offset voltage from
the waveform.
If the channel is AC coupled, the DC component of the signal is removed,
allowing for greater sensitivity to display the AC component of the signal.
Ground
The channel is grounded by an internal switch. GND coupling is used to observe the zero offset error of the analog
channels or determine the source of noise in the waveform (from signal or from oscilloscope itself).
