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8
To Trigger the Oscilloscope
As for trigger, you set certain trigger condition according to the requirement and
when a waveform in the waveform stream meets this condition, the oscilloscope
captures this waveform as well as the neighboring part, and displays them on the
screen. For the digital oscilloscope, it samples waveform continuously no matter
whether it is stably triggered, but only stable trigger can be stably displayed. The
trigger module ensures that every time base sweep or acquisition starts from the
user-defined trigger condition, namely every sweep is synchronous with the
acquisition and the waveforms acquired is overlapped so as to display the stable
waveforms.
Trigger settings should be based on the features of the input signal. To quickly
capture the desired waveform, you need to understand the signal under test. This
oscilloscope provides abundant trigger types that help you focus on the desired
waveform details.
8.1 Trigger Source
In the trigger control area on the front panel, press > Source, then rotate the
multifunction knob to select a desired source, then press down the knob to select
it. You can also press Source continuously or enable the touch screen to select it.
The analog channels (CH1-CH4), digital channels (D0-D15), EXT, or AC Line can all be
selected as the trigger source.
Analog channel input:
Signals input from analog channels CH1-CH4 can all be used as trigger sources. No
matter whether the channel selected is enabled, the channel can work normally.
Digital channel input:
Signals input from digital channels D0-D15 can all be used as trigger sources. No
matter whether the channel selected is enabled, the channel can work normally.
External trigger input:
The external trigger source can trigger on the fifth channel while all the other four
channels are acquiring data. The trigger signal (e.g. external clock or signal of the
circuit under test) will be connected to EXT trigger source via the external trigger
input terminal [EXT TRIG] connector. You can set the trigger conditions within the
range of the trigger level (from -8 V to +8 V).
AC line input:
The trigger signal is obtained from the AC power input of the oscilloscope. AC trigger
is usually used to measure signals relevant to the AC power frequency. For example,
To Trigger the Oscilloscope
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