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Chapter 2
Using the SCXI-1127
–
Multiplexer
Output
+
OUT0±
Four-Wire Channel Scanning Configuration
SCXI-1127 User Manual
R
1
–
+
V
1
V
2
Both channel 24 (V
positive terminal of these sources go to screw terminals labeled 24 and 59
respectively. The negative terminals or the common reference for the
voltage source is wired to the 1_WIRE_LO_REF screw terminals.
The output of the multiplexer is available through the OUT0 bus.
Resistance is measured at channel 4 and voltage at channels 24 and 59.
You can use an SCXI-1127 as a 16-to-1 four-wire multiplexer. Figure 2-6
shows a block diagram of the input switching structure in four-wire mode.
You can connect up to 16 four-wire channels to the SCXI-1127 using a
SCXI-1331 terminal block. The four-wire multiplexer consists of dual
16-to-1 multiplexers.
Figure 2-5. One-Wire Wiring Diagram
) and 59 (V
) are measuring voltage sources. The
1
2
2-6
SCXI-1127
© National Instruments Corporation
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