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National Instruments Corporation
5
SCC-CI20 Current Input Module User Guide
The input resistors are socketed so that you can replace them when
necessary. Figure 2 shows the locations of the input and spare resistors.
Figure 2.
SCC-CI20 Parts Locator Diagram
For information about how to configure the SCC-CI20 module using
NI-DAQmx, refer to the
SCC Quick Start Guide
.
Using the SC-C120 when Scaling Voltage Measurements
If you configured the SCC-CI20 using Measurement & Automation
Explorer (MAX) and you are using NI-DAQ, the reading you get from the
E Series DAQ device accounts for the voltage-to-current conversion and
returns milliamps, not volts. Otherwise you must convert the raw voltage
measurement to a current measurement. To make this conversion, use the
following formula:
where
I
is in milliamps and
V
is in volts.
1 Input Resistor for AI (
X
)
2 Product Name
3 Assembly Number
4
Spare Resistors
5
Input Resistor for AI (
X
+8)
1
3
2
4
5
I
V
0.249
-------------
=
