National-instruments Isolated Analog Input Modules SCC-AI03 Manual do Utilizador descarregar pdf (Página 5)

Connecting the Input Signals

Note The signal names have changed. Refer to ni.com/info and enter rdtntg to

confirm the signal names.

Each screw terminal on the SCC-AI is labeled by pin number <1..4>. Pins 1

and 2 form a channel routed to E/M Series DAQ device channel X+8, and

pins 3 and 4 form a channel routed to the E/M Series DAQ device channel

X, where X is 0 to 7 depending on the socket where you plug in the module.

The SCC-AI provides channel-to-ground and module-to-module isolation

only. It does not provide isolation between the two channels of the SCC-AI.

Because both channels must have the same reference voltage, pins 1 and 3

are connected together internally.

Figure 1 shows the SCC-AI signal connections.

Figure 1. SCC-AI Signal Connections

The inputs are designed in a floating (nonreferenced) single-ended

configuration. If the measured signals are floating, connect the negative

input pins, 1 and 3, to AI SENSE on the SC-2345/2350 terminal block or

AI GND on the SC-68, through a 10 kΩ to 100 kΩ resistor. Figure 2 shows

a floating signal connection on one channel of the SCC-AI.

Lowpass

Filter

–

Lowpass

Filter

E/M Series DAQ Device

Signal

Source

AI (X )

SCC-AI

AI SENSE

AI GND

AI (X+8)

1 2 3 4 5 6 7 8 9 10 ... 13 14

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National-instruments Isolated Analog Input Modules SCC-AI03 Manual do Utilizador Página 5