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14 PCI-1720 User's Manual

3.3 Analog Input Connections

This section continues to describe how to make analog input signal

connections to the PCI-1713 card via the I/O connector.

Single-ended Channel Connections

The single-ended input configuration has only one signal wire for

each channel, and the measured voltage (Vm) is the voltage of the

wire referred to the common ground.

A signal source without a local ground is also called a “floating

source”. It is fairly simple to connect a single-ended channel to a

floating signal source. In this mode, the PCI-1713 card provides a

reference ground for external floating signal sources.

Figure 3-2 shows a single-ended channel connection between a

floating signal source and an input channel on the PCI-1713 card.

Figure 3-2: Single-ended input channel connection

ExternalInternal

Floatin

nal

Source

Multiplexers

AI31

AI1

AI0

PGIA

Measured

Voltage

I/O Connector

GND

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 53 54

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