TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
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Edge Triggering
An edge trigger event occurs when the trigger source passes through a specified
voltage level (the trigger level) in a specified direction (the trigger slope). You
will likely use edge triggering for most of your measurements. This section
describes how to use edge triggering. It also explains how to select the trigger
mode, auto or normal, for all trigger types.
To Check Edge Trigger Status
To quickly check if edge triggers are selected, check the Trigger readout. When
edge triggers are selected, the trigger readout displays the trigger source, as well
as the trigger slope and level (see Figure 3–11).
Main Time Base
Main Time Base Time/Div
Main Trigger
Source = Ch 1
Main Trigger
Slope = Rising Edge
Main Trigger Level
Figure 3–11: Edge Trigger Readouts
To determine the trigger status, check the TRIG’D, READY, and ARM status
lights in the Trigger control area (see Figure 3–26):
When TRIG’D is lighted, the digitizing oscilloscope has recognized a valid
trigger and is filling the posttrigger portion of the waveform.
When READY is lighted, the digitizing oscilloscope can accept a valid
trigger event and it is waiting for that event to occur.
When ARM is lighted, the trigger circuitry is filling the pretrigger portion of
the waveform record.
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