Figure 4-15. trig2 input signal timing, Figure 4-16. trig2 output signal timing – National Instruments NI 6014 User Manual
Page 50
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.
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.
Figures 4-15 and 4-16 show the input and output timing requirements
for TRIG2.
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