National-instruments Isolated Analog Input Modules SCC-AI03 Instrukcja Użytkownika Pobierz pdf (Strona 7)

Using the SCC-AI when Scaling Voltage Measurements

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.

Calibrating Gain and Offset Errors

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.

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.

Table 2. SCC-AI 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

1 2 3 4 5 6 7 8 9 10 11 12 13 14

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National-instruments Isolated Analog Input Modules SCC-AI03 Instrukcja Użytkownika Strona 7