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Chapter 2 Hardware Overview
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National Instruments Corporation 2-11 NI 5911 User Manual
Figure 2-6. High-Hysteresis Analog Triggering Mode
In high-hysteresis analog triggering mode, the trigger is generated when the
signal value is greater than triggerValue, with the hysteresis specified by
hysteresisValue. The signal must cross back below the hysteresisValue
before another trigger is generated.
Figure 2-7. Low-Hysteresis Analog Triggering Mode
In low-hysteresis analog triggering mode, the trigger is generated when the
signal value is less than triggerValue, with the hysteresis specified by
hysteresisValue. The signal must cross back above the hysteresisValue
before another trigger is generated.
Trigger Hold-Off
Trigger hold-off is provided in hardware using a 32-bit counter clocked by
a 25 MHz internal timebase. With this configuration, you can select a
hardware hold-off value of 40 ns to 171.8 s in increments of 40 ns.
Trigger
Value
Trigger
Hysteresis
Value
Falling Edge Trigger
Rising Edge Trigger
Hysteresis
Value
Trigger
Trigger
Value
Falling Edge Trigger
Rising Edge Trigger
CBIHWum.book Page 11 Thursday, October 29, 1998 1:56 PM