Operating Basics
40 TDS5000B Series Quick Start User Manual
Trigger Modes
The trigger mode determines how the instrument behaves in the absence of a trigger event:
H Normal trigger mode enables the instrument to acquire a waveform only when it is triggered. If no trigger
occurs, the last waveform record acquired remains on the display. If no last waveform exists, no waveform
is displayed.
H Auto trigger mode enables the instrument to acquire a waveform even if a trigger does not occur. Auto
mode uses a timer that starts after a trigger event occurs. If another trigger event is not detected before the
timer times out, the instrument forces a trigger. The length of time it waits for a trigger event depends on
the time base setting.
Auto mode, when forcing triggers in the absence of valid triggering events, does not synchronize the waveform
on the display. The waveform will appear to roll across the screen. If valid triggers occur, the display will
become stable.
You can also force the instrument to trigger with a n edge trigger by clicking the Force Trigger button on the
Trigger Setup control window.
Trigger Holdoff
Trigger holdoff can help stabilize triggering. When the instrument recognizes a trigger event, it disables the
trigger system until acquisition is complete. In addition, the trigger system remains disabled during the holdoff
period that follows each acquisition. Adjust holdoff to obtain stable triggering when the instrument is triggering
on undesired trigger events.
Trigger Coupling
Trigger coupling determines what part of the signal is passed to the trigger circuit. Edge triggering can use all
available coupling types: AC, DC, Low Freque ncy Rejection, High Frequency Rejection, and Noise Rejection. All
other trigger ty pes use DC coupling only.
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