ADLINK PXI-2208 - Manual (Page 85)

Operation Theory 73
Below-Low Analog Trigger Condition
Figure 4-32 shows the below-low analog trigger condition, the
trigger signal is generated when the input analog signal is less
than the Low_Threshold voltage, and the High_Threshold set-
ting is not used in this trigger condition.
Figure 4-32: Below-Low Analog Trigger Condition
Above-High Analog Trigger Condition
Figure 4-33 shows the above-high analog trigger condition, the
trigger signal is generated when the input analog signal is
higher than the High_Threshold voltage, and the
Low_Threshold setting is not used in this trigger condition.
Figure 4-33: Above-High Analog Trigger Condition