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Chapter 6 Trigger System
105
Figure 6-13 Trigger Coupling Menu
1) DC coupling - allows DC and AC signals to enter the trigger path.
2) AC coupling - removes any DC offset voltage from the trigger waveform.
When the waveform has a large DC offset, stable edge triggering can be achieved using AC coupling.
3) HFRej. (High Frequency Rejection Coupling) - removes high frequency components from the trigger
waveform, using high frequency rejection to remove high frequency noises or noises from fast system clocks,
from trigger paths such as AM or FM radio stations.
4) LFRej. (Low Frequency Rejection Coupling) - removes any unnecessary low frequency components from the
trigger waveform, for example, power line frequencies that can interfere with correct trigger.
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