ADLINK ACL-8112 Series - Manual (Page 58)

50 • Calibration & Utilities
6.2 VR Assignment
There are six variable resistors (VR) on the ACL-8112DG/HG board.
These allow the user to make adjustments 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 the user 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
D/A CH1 calibration
1. Connect the DVM <+> to CN3.AO1, and the VDM<-> to
CN3.GND .
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.