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Chapter 4
Connecting Signals
© National Instruments Corporation
4-21
the selected edge of TRIG2 is received, the device acquires a fixed number
of scans and the acquisition stops. This mode acquires data both before and
after receiving TRIG2.
of scans and the acquisition stops. This mode acquires data both before and
after receiving TRIG2.
As an output, TRIG2 reflects the posttrigger in a pretriggered acquisition
sequence even if another PFI is externally triggering the acquisition.
TRIG2 is not used in posttriggered data acquisition. The output is an active
high pulse with a pulse width of 25 to 50 ns. This output is set to high
impedance at startup.
sequence even if another PFI is externally triggering the acquisition.
TRIG2 is not used in posttriggered data acquisition. The output is an active
high pulse with a pulse width of 25 to 50 ns. This output is set to high
impedance at startup.
Figures 4-13 and 4-14 show the timing requirements for TRIG2.
Figure 4-13. TRIG2 Input Signal Timing
Figure 4-14. TRIG2 Output Signal Timing
Rising-Edge
Polarity
Falling-Edge
Polarity
t
w
= 10 ns minimum
t
w
t
w
= 25 to 50 ns
t
w