Launch EM101N User Manual page 17

LAUNCH
Reversed
Coupling mode
Probe type
3. Trigger setting
The trigger determines when the Oscilloscope starts to acquire data and display a waveform. When a
trigger is set up properly, it can convert unstable displays or blank screens into meaningful waveforms.
When the Oscilloscope starts to acquire a waveform, it collects enough data so that it can draw the
waveform to the left of the trigger point. The Oscilloscope continues to acquire data while waiting for the
trigger condition to occur. After it detects a trigger, the Oscilloscope continues to acquire enough data so
that it can draw the waveform to the right of the trigger point.
Trigger indicates when a certain waveform meets the conditions that are predefined according to the
requirements, the Oscilloscope presents the acquired data on the screen.
Go to Trigger, the following screen will appear:
The EM101N applies edge trigger, which is the most commonly used and effective trigger method. A
clear majority of applications apply this trigger method to trigger waveform. An edge trigger determines
whether the Oscilloscope finds the trigger point on the rising/falling/dual edge of a signal. When the
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EM101N New Energy Oscillograph Multimeter User Manual
This option will affect how channel is displayed.
ON: Turn on the invert function. When Invert is set as On, voltage value of
displayed wave is reversed (upside down). When using basic trigger, it is
necessary to adjust the trigger level to keep waveform triggered steadily.
OFF: Restore to the original display of the waveform.
Trigger coupling determines what part of the signal passes to the trigger
circuit. AC and DC are included:
DC: Both DC and AC current can pass through, and can be used to view
waveform as low as 0Hz without large DC offset.
AC: The DC signal of the tested signal is blocked, and only AC current is
allowed to pass through, and can be used to view waveform with large DC
offset.
Choose the probe attenuation coefficient.
Attenuation coefficient changes the vertical ratio of EM101N so that the
measurement results reflect the true voltage at the probe.
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