Measurement Computing Data Acquisition Systems rev.10.4 - Manual (Page 307)

The range of trigger values defined by the variance and level parameters depends also upon the
trigSensitivity
setting and the type of input channel that is configured as the trigger channel. The following
table describes how the the trigSource and trigSensitivity parameters influence the trigger values
established by the level and variance parameters.
DatsHardwareAnalog can only be used when the trigger channel is first channel in the scan
group configuration (see daqAdcSetScan)
Interaction of Trigger Variance with Trigger Level and Trigger Sensitivities
Trigger Start/Stop
Source
Trigger
Sensitivities
Trigger Start/Stop Criteria
DetsRisingEdge Triggers/Stops when: signal value < (level-variance)
Then, signal value > level
DetsFallingEdge Triggers/Stops when: signal value > (level+variance)
Then, signal value < level
DetsAboveLevel Triggers/Stops when: signal value > (level)
Analog (P1)
DatsHardwareAnalog
DetsBelowLevel Triggers/Stops when: signal value < (level)
DetsRisingEdge Triggers/Stops when: signal value < (level-variance)
Then, signal value > level
DetsFallingEdge Triggers/Stops when: signal value > (level+variance)
Then, signal value < level
DetsAboveLevel Triggers/Stops when: signal value > (level)
DetsBelowLevel Triggers/Stops when: signal value < (level)
DetsEQLevel Triggers/Stops when: (level-variance)< signal value
< (level+variance)
Analog (P1)
DatsSoftwareAnalog
DetsNELevel Triggers/Stops when: signal value < (level-variance)
or
signal value > (level+variance)
DetsAboveLevel Triggers/Stops when:
Dig channel bank > (level AND(bitwise)variance)
DetsBelowLevel Triggers/Stops when:
Dig channel bank < (level AND(bitwise)variance)
DetsEQLevel Triggers/Stops when:
Dig channel bank = (level AND(bitwise)variance)
DetsNELevel Triggers/Stops when:
Dig channel bank != (level AND(bitwise)variance)
Digital (P2/P3)
DatsDigPattern
DetsRisingEdge Triggers/Stops when:
counter channel < (level-variance) Then,
counter channel > level
DetsFallingEdge Triggers/Stops when: counter channel > (level+variance)
Then, counter channel < level
DetsAboveLevel Triggers/Stops when: Counter channel > (level-variance)
DetsBelowLevel Triggers/Stops when: Counter channel < (level+variance)
DetsEQLevel Triggers/Stops when:
(level-variance)< counter channel < (level+variance)
Counter (P3)
DatsCounter
DetsNELevel Triggers/Stops when: Counter channel < (level-variance)
Or
counter channel > (level+variance)
Programmer’s Manual
908594
Daq API Command Reference 4.6-29