JYTEK PCIe-69834, Руководство пользователя

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18 Operations
Figure 3-4: External Digital Trigger
3.3.3 Analog Trigger
An analog trigger is generated when AI input signal level is
detected at the SMB connectors CH0 to CH3 (selected by soft-
ware). The trigger level is also selected by software.
3.4 Trigger Modes
Trigger modes applied to trigger sources initiate different data
acquisition timings when a trigger event occurs. The following trig-
ger mode descriptions are applied to analog input function.
3.4.1 Post Trigger Mode
Post-trigger acquisition is applicable when data is to be collected
after the trigger event, as shown. When the operation starts,
PCIe-
69834
waits for a trigger event. Once the trigger signal is
received, acquisition begins. Data is generated from ADC and
transferred to system memory continuously. The acquisition stops
once the total data amount reaches a predefined value.
Pulse Width > 20ns
Pulse Width > 20ns
Rising Edge Trigger Event Falling Edge Trigger Event