Measurement-computing PCI-PDISO16 Manuale Utente Scaricare il pdf (Pagina 16)

Chapter 3

Functional Description

Isolated inputs

The PCI-PDISO16 board has eight isolated input channels. A schematic of a single channel is shown in Figure

6. The signals are routed through a bridge rectifier so that the inputs are not polarity sensitive.

470 Ohm

Isolated Input

Not Polarized

Circuitry Sharing

PC Ground

Filter Switch

0.1uF

47K

+5V

100K

Figure 6. Isolated input channel - simplified schematic

Extending the input range

To extend the input range beyond the 5-28V specified, add an external resistor. Figure 7 shows the resistor and

the equations used to calculate resistor values for a given V

1.6 K

Isolated Input

Not Polarized

R ext

Vin

R ext = 100 * (Vin - 28)

Pw = R ext / 10 000

Figure 7. Input voltage range extender resistor

Digital I/O Techniques

For more information about digital I/O techniques, refer to the Guide to Signal Connections. This document is

available on our web site at www.mccdaq.com/signals/signals.pdf.

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Measurement-computing PCI-PDISO16 Manuale Utente Pagina 16