Adlink DAQe-2502 Manual do Utilizador descarregar pdf (Página 63)

Operation Theory 53

The trigger signal asserts when an analog trigger condition is met.

There are five analog trigger conditions in DAQ-/DAQe-/PXI-2502/

2501 card. The DAQ-/DAQe-/PXI-2502/2501 card uses two

threshold voltages: Low_Threshold and High_Threshold to com-

pose five different trigger conditions. You can configure the trigger

conditions easily via software.

Below-Low Analog Trigger Condition

Figure 4-26 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 4-26: Below-Low Analog Trigger Condition

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 4-8: Ideal Transfer Characteristic of Analog Trigger SRC1

(EXTATRIG)

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 73 74

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Adlink DAQe-2502 Manual do Utilizador Página 63