ADLINK ACL-8112 Series - Manual (Page 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.