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154 PI-MAX
®
4 System Manual Issue 4
9.3.2 Trigger Source
The trigger source is selectable via the Trigger Source drop-down list. The trigger source
can either be internal or external and is configured on the Trigger expander. See
Figure 9-3.
In addition, when using an internal trigger, the frequency is configured via the
SuperSYNCHRO expander. See Figure 9-4.
Figure 9-4: SuperSYNCHRO Timing Expander: DIF Operation
9.3.2.1 Internal Trigger Source
Trigger pulses are generated by the PI-MAX4 based on the Internal Trigger Frequency
setting as configured on the SuperSYNCHRO Timing expander. The range of settings is
2 Hz to 1 MHz, in 1 Hz increments. Note that the Internal Trigger Frequency setting also
determines the frequency of SynchMASTER1 and SyncMASTER2 outputs.
9.3.2.2 External Trigger Source
In order for the PI-MAX4 to recognize triggers from an external source, the characteristics
of the triggers to be used in triggering DIF acquisition must be configured. These
characteristics include:
• Trigger Threshold;
• Coupling;
• Termination;
• Polarity.
These parameters are configured on the Trigger expander.
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