Advantech PCI-1720 Manual de usuario descargar pdf (Pagina 29)

Chapter 5 Signal Connections 25

Figure 5-2: Grounded-load connection for D/A voltage output

Figure 5-3: Differential-load connection for D/A voltage output

5.3 Current Sink Connections

The PCI-1720's current loop output uses a 0 to +5 V (unipolar)

voltage output as each channel’s driving source. Current drive

circuits consist of a power field-effect transistor (FET). The current

output’s voltage bias must be less then 50 V for accurate results. The

card also provides an internal +12 V power source for current loop

excitation.

You can use three types of current sink connections:

1. Grounded load with a floating power supply.

2. Floating load with a grounded power supply.

D/A

Internal Side

V

OUT

AGND

External Side

Grounded

Load

D/A

Internal Side

V

OUT

AGND

External Side

Diff.

Load

with

Ground

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