National Instruments PCI-1200 用户手册

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Figure 3-3 shows how to connect a ground-referenced signal source to a 
PCI-1200 board configured for DIFF input. Configuration instructions are 
in the 

 section in Chapter 2, 

Figure 3-3.  Differential Input Connections for Grounded Signal Sources

With this type of connection, the instrumentation amplifier rejects both the 
common-mode noise in the signal and the ground-potential difference 
between the signal source and the PCI-1200 ground (shown as V

cm

 in 

Figure 3-3).

+

+

Grounded

Signal

Source

V

m

Measured

Voltage

V

s

+

 I/O Connector

PCI-1200 in DIFF Configuration

1

3

5

7

2

4

6

8

Common-

Mode

Noise,

Ground

Potential

ACH0

AGND

11

ACH2

ACH4

ACH6

ACH1

ACH3

ACH5

ACH7

V

cm

–

+

PC0

–

–

–