National Instruments 6024E 用户手册

Figure 4-5 shows how to connect a ground-referenced signal source to a
channel on the device configured in DIFF input mode.

Figure 4-5. Differential Input Connections for Ground-Referenced Signals

With this type of connection, the PGIA rejects both the common-mode
noise in the signal and the ground potential difference between the signal
source and the device ground, shown as V

cm

in Figure 4-5.

Ground-

Referenced

Signal

Source

Common-

Mode

Noise and

Ground

Potential

Input Multiplexers

AISENSE

V

m

Measured

Voltage

AIGND

–

+

–

+

+

–

–

+

I/O Connector

ACH+

ACH–

Selected Channel in DIFF Configuration

PGIA

Programmable Gain

Instrumentation

Amplifier

Vs

Vcm