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50 • Calibration & Utilities

6.2 VR Assignment

There are 6 variable resistors (VR) on the ACL-8112DG/HG board. These

allow you to make adjustment to the A/D and D/A channels. The function of

each VR is specified as Table 6.1-1.

VR1 A/D full scale adjustment

VR2 A/D bipolar offset adjustment

VR3 D/A channel 1 full scale adjustment

VR4 D/A channel 2 full scale adjustment

VR5 A/D programmable amplifier offset adjustment

VR6 A/D unipolar offset adjustment

Table 6.1-1 Function of VRs in ACL-8112DG/HG

There are five variable resistors (VR) on the ACL-8112PG board. These

allow you to make adjustment to the A/D and D/A channels. The function of

each VR is specified as Table 6.1-2.

VR1 A/D full scale adjustment

VR2 A/D offset adjustment

VR3 D/A channel 1 full scale adjustment

VR4 D/A channel 2 full scale adjustment

VR5 A/D programmable amplifier offset adjustment

Table 6.1-2 Function of VRs in ACL-8112PG

6.3 D/A Adjustment

6.3.1 D/A CH1 calibration

1. Connect the DVM <+> to CN3.AO1<PIN 30>, and the VDM<-> to

CN3.GND <PIN 10>.

2. Write a digital value into the D/A register (BASE+4 and BASE+5).

3. Trim VR3 until +5 V appears on the DVM.

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Adlink ACL-8112 Series Manual do Utilizador Página 58