Connecting The Input Signals - National Instruments SCC-PWR01 User Manual

Connecting the Input Signals

Note The signal names have changed. Refer to
confirm the signal names.
SCC-AI
Signal
Source
4
+
–
3
2
+
–
1
© National Instruments Corporation
Each screw terminal on the SCC-AI is labeled by pin number <1..4>. Pins 1
and 2 form a channel routed to E/M Series DAQ device channel X+8, and
pins 3 and 4 form a channel routed to the E/M Series DAQ device channel
X, where X is 0 to 7 depending on the socket where you plug in the module.
The SCC-AI provides channel-to-ground and module-to-module isolation
only. It does not provide isolation between the two channels of the SCC-AI.
Because both channels must have the same reference voltage, pins 1 and 3
are connected together internally.
Figure 1 shows the SCC-AI signal connections.
+
–
+
–
Figure 1. SCC-AI Signal Connections
The inputs are designed in a floating (nonreferenced) single-ended
configuration. If the measured signals are floating, connect the negative
input pins, 1 and 3, to AI SENSE on the SC-2345/2350 terminal block or
AI GND on the SC-68, through a 10 kΩ to 100 kΩ resistor. Figure 2 shows
a floating signal connection on one channel of the SCC-AI.
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Lowpass
Filter
Lowpass
Filter
5 SCC-AI Series Isolated Analog Input Modules User Guide
and enter to
rdtntg
E/M Series DAQ Device
AI ( X )
AI SENSE
AI GND
AI ( X +8)