National Instruments SCXI-1127 - Manual (Page 39)

Chapter 2 Using the SCXI-1127/1128
SCXI-1127/1128 User Manual 2-4 ni.com
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 Making Temperature Measurements 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±