Measurement-computing USB-1208HS-4AO Manual de usuario descargar pdf (Pagina 15)

USB-1208HS-4AO User's Guide Functional Details

Both the period and time delay ranges are 50 ns to 107.4 seconds.

Figure 11. USB-1208HS-4AO PWM timer channel

Trigger input

The TRIG connection is an external digital trigger input. The trigger mode is software selectable for:

 Level-sensitive or edge-sensitive

 Rising or falling edge

 High or low level

The default setting at power up is edge sensitive, rising edge.

Retrigger

The acquisition uses the trigger settings for positive edge/negative edge and level-sensitive/edge-sensitive, but

automatically re-arms the trigger after it is activated

Power output

You can use the two +5V connections to supply power to external devices or circuitry. These terminals can

output up to 285 mA. Refer to Figure 4 and Figure 3 on page 10 for the location of this pin.

Caution! The +5V terminals are outputs. Do not connect to an external power supply or you may damage

the USB-1208HS-4AO and possibly the computer.

Ground

The analog ground (AGND) connections provide a common ground for all analog I/O channels. The ground

(

GND) connections provide a common ground for the digital I/O, timer/counter I/O, timer, clock I/O, and the

+5 V terminals.

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Measurement-computing USB-1208HS-4AO Manual de usuario Pagina 15