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USB-231 User's Guide Functional Details

External components

The external components on the USB-231 are shown in Figure 3.

1 Screw terminal pins 1 to 16 3 LED Indicator

2 Screw terminal pins 17 to 32 4 USB connector

Figure 3. USB-231 external components

Screw terminals

The screw terminals provide the following connections (refer to Figure 4 and Figure 5 for pinout diagrams):

 Eight single-ended/four differential analog inputs (

CH0H/CH0L to CH3H/CH3L)

 Two analog outputs (

AOUT0 and AOUT1)

 Digital trigger input (

TRIG)

 Counter input (

CTR)

 User voltage output

(+VO)

 Analog ground reference (

AGND) and digital ground reference (GND)

Caution! To ensure the specified EMC performance, the length of any wire or cable connected to the screw

terminal connector must be no longer than 0.5 m (20 in.).

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Measurement-computing USB-231 Manuale Utente Pagina 11