National Instruments AT E Series TRIG2 Signal

Chapter4 ConnectingSignals

ATE Series User Manual 4-34 ni.com

Figures 4-15 and 4-16 show the input and output timing requirements for

the TRIG1 signal.

Figure4-15. TRIG1Input Signal Timing

Figure4-16. TRIG1Output Signal Timing

The devicealso uses the TRIG1 signal to initiate pretriggered DAQ

operations. In most pretriggered applications, the TRIG1 signal is

generated bya software trigger. Refer to the TRIG2 signal description for

acomplete description of the use of TRIG1 and TRIG2 in a pretriggered

DAQoperation.

TRIG2 Signal

Any PFIpin can externally input the TRIG2 signal, which is available as

an output on the PFI1/TRIG2 pin.

Refert o Figure 4-13 for the relationship of TRIG2 to the DAQsequence.

As aninput, the TRIG2 signal is configured in the edge-detection mode.

Youcan select any PFI pin as the source for TRIG2 and configure the

polarityselection f or either rising or falling edge. The selected edge of the

TRIG2signal initiates the posttriggered phase of a pretriggered acquisition

sequence. In pretriggered mode, the TRIG1 signal initiates the data

acquisition. The scan counter indicates the minimum number of scans

Rising-Edge

Polarity

Falling-Edge

Polarity

tw=10 ns minimum

tw=50to100ns