Adlink DAQe-2006 Manual do Utilizador descarregar pdf (Página 79)

Operation Theory 67

Low-Hysteresis analog trigger condition

Figure 4-36 shows the low-hysteresis analog trigger condition,

the trigger signal is generated when the input analog signal

level is less than the Low_Threshold voltage, and the

High_Threshold voltage determines the hysteresis duration.

Note the High_Threshold setting should be always higher then

the Low_Threshold voltage setting.

Figure 4-36: Low-Hysteresis Analog Trigger Condition

External Digital Trigger

An external digital trigger occurs when a rising edge or a falling

edge is detected on the digital signal connected to the EXT-

DTRIG or the EXTWFTRG of the 68-pin connector for external

digital trigger. The EXTDTRIG is dedicated for A/D process,

and the EXTWFTRG is used for D/A process. You can program

the trigger polarity using the software drivers. Note that the sig-

nal level of the external digital trigger signals should be TTL-

compatible and the minimum pulse is 20 ns.

Figure 4-37: External Digital Trigger

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Adlink DAQe-2006 Manual do Utilizador Página 79