SCC-AI Series Isolated Analog Input Modules
14
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Calibrating Gain and Offset Errors
The SCC-AI
XX
is calibrated at the factory before shipment. If you want to
adjust the gain of the SCC-AI
XX
in your system using your E Series DAQ
device, you need a voltage source that is several times more accurate than
the SCC itself and capable of providing the DC voltage shown in Table 1-3.
To adjust the gain of the SCC-AI
XX
, complete the following steps:
1.
Select the desired SCC-AI
XX
channel on the E Series DAQ device.
2.
Set the gain on the E Series DAQ device so that its input range is
±
10 V.
3.
Connect the voltage source to the screw terminals of the desired
channel on the SCC-AI
XX
.
4.
Apply the voltage given in Table 1-3 that corresponds to the
SCC-AI
XX
module. For example, if you have an SCC-AI03, you must
apply 8 VDC.
5.
Using your software, have the E Series DAQ device read the desired
channel on the SCC-AI
XX
and record the value.
6.
Input 0 VDC to the SCC-AI
XX
.
7.
Use the E Series DAQ device to read that channel and record the value.
8.
Subtract the values read (
first reading
–
second reading
).
Table 1-3.
SCC-AI
XX
Input Voltage Requirements
Module
Input Range
SCC-AI01
40 V
SCC-AI02
16 V
SCC-AI03
8 V
SCC-AI04
4 V
SCC-AI05
800 mV
SCC-AI06
80 mV
SCC-AI07
40 mV
SCC-AI13
8 V
SCC-AI14
4 V