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Chapter 4
Connecting Signals
4-24
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ignores TRIG2 if it is asserted prior to the SC decrementing to zero. After
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.
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.
As an output, TRIG2 reflects the posttrigger in a pretriggered DAQ
sequence, even if the acquisition is being externally triggered by another
PFI. TRIG2 is not used in posttriggered data acquisition. The output is an
active high pulse with a pulse width of 50 to 100 ns. This output is set to
high-impedance at startup.
sequence, even if the acquisition is being externally triggered by another
PFI. TRIG2 is not used in posttriggered data acquisition. The output is an
active high pulse with a pulse width of 50 to 100 ns. This output is set to
high-impedance at startup.
Figure 4-15. TRIG2 Input Signal Timing
Figure 4-16. TRIG2 Output Signal Timing
Rising-Edge
Polarity
Falling-Edge
Polarity
t
w
= 10 ns minimum
t
w
t
w
= 50 to 100 ns
t
w