Analog Edge Triggering; Analog Edge Triggering With Hysteresis - National Instruments NI 6221 User Manual

Chapter 11 Triggering

Analog Edge Triggering

Analog Edge Triggering with Hysteresis

M Series User Manual
Configure the analog trigger circuitry to detect when the analog signal is
below or above a level you specify.
In below-level analog triggering mode, shown in Figure 11-3, the trigger is
generated when the signal value is less than Level.
Analog Comparison Event
Figure 11-3. Below-Level Analog Triggering Mode
In above-level analog triggering mode, shown in Figure 11-4, the trigger is
generated when the signal value is greater than Level.
Level
Analog Comparison Event
Figure 11-4. Above-Level Analog Triggering Mode
Hysteresis adds a programmable voltage region above or below the trigger
level that an input signal must pass through before the DAQ device
recognizes a trigger condition, and is often used to reduce false triggering
due to noise or jitter in the signal.
Level
11-4 ni.com