National Instruments 1128 用户手册

Figure 2-3 shows an example of a 2-wire configuration using the 
SCXI-1331 terminal block. The diagram shows the 2-wire terminal block 
connections for channels 2, 5, 24, and 27. Channel 2 measures a voltage 
source (V

1

). The positive terminal of channel 2 is labeled +2 with the 

negative channel labeled –2. The output of the multiplexer is available 
through the OUT0 bus.

Figure 2-3.  2-Wire Wiring Diagram

You can connect different types of 2-wire inputs to the SCXI-1127. For 
example, in Figure 2-3, a thermocouple (V

2

) is shown connected to 

channel 27, and on channel 5 (R

1

) and 24 (R

2

) resistance measurements are 

being made. Consult the 

 section for 

more information on temperature compensation measurements for making 
accurate thermocouple measurements.

SCXI-1127

R

1

R

2

V

2

Thermocouple

Multiplexer Output

–

+

V

1

–

+

OUT0±