National Instruments NI 6120 用户手册

© National Instruments Corporation

Figures 4-2 and 4-3 show how to connect a ground-referenced signal 
source to a channel on the NI 6115 and NI 6120, respectively.

 

Figure 4-2.  Pseudodifferential Input Connections on the NI 6115 

for Ground-Referenced Signals

V

m

ACH0 Connections Shown

PGIA

100 pf

*

10 nf

Ground-

Referenced

Signal

Source

Common-

Mode

Noise and

Ground

Potential

AC Coupling

1 M

*

Instrumentation

Amplifier

I/O Connector

ACH0GND

ACH0–

ACH0+

Measured

Voltage

+

–

+

–

*

10 k

Ω

40 pf 

for ranges > ±10 V

V

s

V

cm

+

–

+

–

Common-Mode

Choke