Using the Hardware Start Trigger for Single Pulse Generation
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Single pulse generation creates a single pulse after the counter is armed and after a hardware signal is received. Depending on the type of counter, it can be possible to specify the delay and pulse width.The DAQ-STC or NI-TIO based counters specify the pulse delay with COUNT_1 parameter (the number of source pulses to wait) and the pulse width with the COUNT_2 parameter.
Common Applications
8253-based counters:
Mode 1 generates a pulse of specified width after the rising edge of a gate pulse.
Mode 1 Timing Diagram
Mode 5 generates a pulse with a specified delay but a width of one source pulse after a rising edge on the gate.
Mode 5 Timing Diagram
Am9513 based counters:
The Am9513 counters can generate a pulse with the delay and the width user-specifiable. Use CTR Pulse Config.vi in LabVIEW or CTR_Pulse in NI-DAQ.
DAQ-STC based counters:
The DAQ-STC counters can generate a pulse with the delay and the width user-specifiable. Use the Counter Group Config VI in LabVIEW and use the Counter Set Attribute VI to set Pulse Spec 1 and 2. In NI-DAQ, use GPCTR_Set_Application with application = ND_SINGLE_TRIG_PULSE_GNR and GPCTR_Change_Parameter with ND_COUNT_1 and ND_COUNT_2.
Single Triggered Pulse Generation
NI-TIO based counters:
The NI-TIO counters (presently used only on the PCI-6601/6602 devices) can also generate pulses with specifiable delay and width. Use the Counter Group Config VI in LabVIEW and set Pulse Spec 1 and 2 with the Counter Set Attribute VI. (In NI-DAQ, use GPCTR_Set_Application width ND_SINGLE_TRIG_PULSE_GNR and GPCTR_Change_Parameter respectively).
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