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A-626/A-628/A-726
ISA Bus, 6-/8-ch Analog Output and 16-ch DIO Board
7.2 A-628 Calibration
The each channel of A-628 has three VR can be adjust to current value.
D/A Channel
0
1
2
3
4
5
6
7
Calibration Step:
A. Unipolar (0 ~ 5 V)
You need a 6 1/2 digital voltage meter.
1.
2.
Set D/A channel : (1) Unipolar mode. (2) Reference Voltage : -5 V
Connect DVM to D/A Channel 0
3.
4.
Write 0xFFF (Hex) Data to D/A Channel 0
5.
Trim VR1-2 until the DVM reading 4.9988 V
B. Bipolar (±5 V)
Set D/A channel : (1) Bipolar mode. (2) Reference Voltage : -5 V
1.
Connect DVM to D/A Channel 0
2.
3.
Write 0x800 (Hex) Data to D/A Channel 0
4.
Trim VR1-1 untill the DVM reading 0.0000 V
5.
Write 0xFFF (Hex) to D/A Channel 0
Trim VR1-2 until the DVM reading 4.9988 V
6.
C. Current loop 4 ~ 20 mA
Set D/A Channel : (1) Unipolar mode . (2) Reference Voltage : -5 V
1.
2.
Ref.
Sec. 2.5
signal connection connect DAM to current loop channel
Write 0x000 (Hex) to D/A Channel 0
3.
4.
Trim VR1-3 until the DAM reading 4.0000 mA
Write 0xFFF (Hex) to D/A Channel 0
5.
Trim VR1-2 until the DAM reading 20 mA
Unipolar Full Scale
VR1-2
VR2-2
VR3-2
VR4-2
VR5-2
VR6-2
VR7-2
VR8-2
User Manual/ Ver. 1.4/ Jun. 2013/ IMH-005/ Page: 43
Bipolar Off-set
Current loop 4 mA
VR1-1
VR2-1
VR3-1
VR4-1
VR5-1
VR6-1
VR7-1
VR8-1
VR1-3
VR2-3
VR3-3
VR4-3
VR5-3
VR6-3
VR7-3
VR8-3
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