Table of Contents
Advertisement
Using the SCC-AI when Scaling Voltage Measurements
Calibrating Gain and Offset Errors
© National Instruments Corporation
If you configured the SCC-AI using Measurement & Automation Explorer
(MAX) and you are using NI-DAQmx, the voltage reading you get from the
E/M Series DAQ device accounts for the voltage scaling effect of the
SCC-AI. Otherwise, because the voltage measurement from the E/M Series
DAQ device is scaled by the gain given in Table 1, you must divide the
voltage reading returned by the E/M Series DAQ device by this gain to get
the correct input voltage.
The SCC-AI is calibrated at the factory before shipment. If you want to
adjust the gain of the SCC-AI in your system using your E/M 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 2.
Table 2. SCC-AI Input Voltage Requirements
Module
SCC-AI01
SCC-AI02
SCC-AI03
SCC-AI04
SCC-AI05
SCC-AI06
SCC-AI07
SCC-AI13
SCC-AI14
Gain Adjustment
To adjust the gain of the SCC-AI, complete the following steps:
1.
Select the desired SCC-AI channel on the E/M Series DAQ device.
2.
Set the gain on the E/M 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.
4.
Apply the voltage given in Table 2 that corresponds to the SCC-AI
module. For example, if you have an SCC-AI03, you must apply
8 VDC.
7
SCC-AI Series Isolated Analog Input Modules User Guide
Input Range
40 V
16 V
8 V
4 V
800 mV
80 mV
40 mV
8 V
4 V
Advertisement
Table of Contents
