Adlink ACL-8112 Series Manual do Utilizador descarregar pdf (Página 61)

Calibration & Utilities

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6.3.2 D/A CH2 calibration

1. Connect the DVM <+> to CN3.AO2<PIN 32>, and the DVM<-> to

CN3.GND <PIN 10>.

2. Write a digital value into the D/A register (BASE+6 and BASE+7).

3. Trim VR4 until +5 V appears on the DVM.

6.4 A/D Programmable Gain Amplifier adjustments

This setup is to reduce the PGA offset voltage.

1. Connect CN3.AI0 <PIN 2> to CN3.GND <PIN 9>

2. Trim VR5 until the reading displayed on the monitor of the

8112UTIL.exe software is approximately 0 and below 0.50.

6.5 A/D Adjustment

6.5.1 Bipolar Calibration

1. Adjust the voltage calibrator’s voltage output to –4.9987V . Connect

the voltage calibrator’s <+> to CN3.AI0 <PIN 1> and the voltage

calibrator’s<-> to CN3.AGND<PIN 9>.

2. Trim VR2 to obtain a reading that toggles between 0 and 1. This

value is displayed on the monitor of the calibration program

8112UTIL.exe. Then proceed to the next step.

3. Adjust the voltage calibrator’s voltage output to +4.9963V . Connect

the voltage calibrator’s <+> to CN3.AI0 <PIN 1> and the voltage

calibrator’s <-> to CN3.AGND<PIN 9>.

4. Trim VR1 to obtain a reading that toggles between 4094 and 4095.

This value is displayed on the monitor of the calibration program

8112UTIL.exe.

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Adlink ACL-8112 Series Manual do Utilizador Página 61