PeakTech 1240 Operation Manual page 18

The description of the Channel Menu is shown as the following list:
Function Menu
Coupling
Inverted
Probe
Limit
(only P 1245/1255/1260)
11.2. Setting Channel Coupling
Taking the Channel 1 for example, the measured signal is a square wave signal containing the direct current
bias. The operation steps are shown as below:
* Press the CH1 MENU button and call out the CH1 SETUP menu.
* Press the H1 button, the Coupling menu will display at the screen.
* Press the F1 button to select the Coupling item as "DC". By setting the channel coupling as DC mode, both
DC and AC components of the signal will be passed.
* Then, press F2 button to select the Coupling item as "AC". By setting the channel coupling as AC mode,
the direct current component of the signal will be blocked. The waveforms are shown as Fig. 15.
Setting Description
DC Unblock the AC and DC components in the input signal.
AC Block the DC component in the input signal.
GROUND The Input signal is interrupted.
OFF The waveform is displayed normally.
ON Initiate the waveform inverted function.
1X
10X Choose one according to the probe attenuation factor to
100X make the vertical scale reading accurate.
1000X
full band Get full bandwidth.
20M Limit the channel bandwidth to 20MHz to reduce display
noise.
Fig. 15 AC Coupling Oscillogram
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