100 WM-OM-E Rev I
Edge trigger works on the selected edge at the chosen level. The slope (positive or negative) is specified in the
Trigger label permanently displayed below-right of the grid.
Trigger Source
The Trigger On source may be one of the following:
• The acquisition channel signal (CH 1, CH 2, CH 3 or CH 4) conditioned for the overall
voltage gain, coupling, and bandwidth.
• The line voltage that powers the oscilloscope (LINE). This can be used to provide a
stable display of signals synchronous with the power line. Coupling and level are not
relevant for this selection.
• The signal applied to the EXT BNC connector (EXT). This can be used to trigger the
oscilloscope within a range of +/-400 mV on EXT, +/-4 V with EXT/10 as the trigger
source, or +/-40 mV with EXT*10 as the trigger source.
• A logic pattern.
Level
Level defines the source voltage at which the trigger circuit will generate an event (a change in the
input signal that satisfies the trigger conditions). The selected trigger level is associated with the
chosen trigger source. Note that the trigger level is specified in volts and normally remains
unchanged when the vertical gain or offset is modified.
The Amplitude and Range of the trigger level are limited as follows:
• +/-5 screen divisions with a channel as the trigger source
• +/-400 mV with EXT as the trigger source
• +/-4 V with EXT/10 as the trigger source
• +/-40 mV with EXT*10 as the trigger source
• none with LINE as the trigger source (zero crossing is used)
Note: Once specified, Trigger Level and Coupling are the only parameters that pass unchanged from trigger mode to trigger
mode for each trigger source.
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