Calibrating gain and offset errors, Table 1-3. scc-aixx input voltage requirements – National Instruments Isolated Analog Input Modules SCC-AI14 User Manual

Page 14

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SCC-AI Series Isolated Analog Input Modules

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Calibrating Gain and Offset Errors

The SCC-AIXX is calibrated at the factory before shipment. If you want to
adjust the gain of the SCC-AIXX 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-AIXX, complete the following steps:

1.

Select the desired SCC-AIXX 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-AIXX.

4.

Apply the voltage given in Table 1-3 that corresponds to the
SCC-AIXX 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-AIXX and record the value.

6.

Input 0 VDC to the SCC-AIXX.

7.

Use the E Series DAQ device to read that channel and record the value.

8.

Subtract the values read (first readingsecond reading).

Table 1-3. SCC-AIXX 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

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