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2 external digital trigger, External digital trigger, Figure 3-8: external digital trigger polarity – ADLINK PCI-9846 User Manual

Page 45: And pulse width requirement

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Operation Theory

35

3.4.2 External Digital Trigger

An external digital trigger occurs when a TTL rising edge or a fall-
ing edge is detected at the SMB connector TRG IO on the front
panel. As illustrated in Figure 3-8, the trigger polarity can be
selected by software. Note that the signal level of the external dig-
ital trigger signal should be TTL-compatible, and the minimum
pulse width is 20 ns.

Figure 3-8: External Digital Trigger Polarity and Pulse Width Requirement.

Rising edge

trigger event

Falling edge

trigger event

Pulse Width > 20 ns

Pulse Width > 20 ns

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