ADLINK PXI-2502 - Manual (Page 51)

Operation Theorem
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Trigger Level digital setting Trigger voltage
0xFF 9.92V
0xFE 9.84V
--- ---
0x81 0.08V
0x80 0
0x7F -0.08V
--- ---
0x01 -9.92V
0x00 -10V
Table 4.5.1 Analog trigger SRC1(EXTATRIG) ideal transfer characteristic
The trigger signal asserts when an analog trigger condition is meet. There
are five analog trigger conditions in DAQ/PXI-2500 SERIES.
DAQ/PXI-2500 SERIES uses 2 threshold voltages: Low_Threshold and
High_Threshold to compose 5 different trigger conditions. Users can con-
figure the trigger conditions easily via software.
4.5.2.1 Below-Low analog trigger condition
Figure 4.5.2 shows the below-low analog trigger condition, the trigger
signal asserts when the input analog signal is lower than the
Low_Threshold voltage. High_Threshold setting is not used in this trigger
condition.
Figure 4.5.2 Below-Low analog trigger condition