ADLINK ACL-8112 Series - Manual (Page 59)

Calibration & Utilities • 51
D/A CH2 calibration
1. Connect the DVM <+> to CN3.AO2, and the DVM<-> to
CN3.GND .
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 to CN3.GND
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
Bipolar Calibration
1. Adjust the voltage calibrator’s voltage output to –4.9987V. Connect
the voltage calibrator’s <+> to CN3.AI0 and the voltage
calibrator’s<-> to CN3.AGND.
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 and the voltage
calibrator’s <-> to CN3.AGND.
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.