VL-1225/6 Analog Input/Output Board
7-7
Calibration
The VL-1225/6 is calibrated before shipment. However, it may be desirable to recalibrate the card after
installation, and approximately once each year (depending on the accuracy requirements of the
application).
Required Equipment
• A voltmeter with resolution and accuracy to ½ LSB of the input range being used.
• A low noise voltage source adjustable over the input range.
• A small flat-blade screwdriver.
Figure 7-6. Adjustment Pot Locations
Input Calibration (VL-1225 and VL-1226)
• Disconnect all inputs to the card and connect the voltage source to any channel.
• Using the voltmeter, adjust the voltage source according to table below:
—————— 10-Bit Resolution ——————
——————11-Bit Resolution ——————
±5V
±10V
0 to 10V
±5V
±10V
0 to 10V
Range
Range
Range
Range
Range
Range
–4.99511719V –9.9900.00488281V
–4.99755859V –9.99511719V
+0.00244141V
•
Using a program to continuously read the input channel, adjust the “Input Zero” pot until the
reading toggles between the two values shown in the table below.
—————— 10-Bit Resolution ——————
——————11-Bit Resolution ——————
Offset
Two’s
Offset
Two’s
Binary
Binary
Complement
Binary
Binary
Complement
0000H
0000H
0200H
0000H
0000H
0400H
0001H
0001H
0201H
0001H
0001H
0401H
• Using the voltmeter, adjust the voltage source according to the table below.
—————— 10-Bit Resolution ——————
——————11-Bit Resolution ——————
±5V
±10V
0 to 10V
±5V
±10V
0 to 10V
Range
Range
Range
Range
Range
Range
+4.9859.9709.8535156V
+4.9929.98535156V
+9.99267578V
• Using a program to continuously read the input channel, adjust the “Input Gain” pot until the
reading toggles between the two values shown in the table below.
—————— 10-Bit Resolution ——————
——————11-Bit Resolution ——————
Offset
Two’s
Offset
Two’s
Binary
Binary
Complement
Binary
Binary
Complement
03FFH
03FFH
01FFH
07FFH
07FFH
03FFH
03FEH
03FEH
01FEH
07FEH
07FEH
03FEH
Reference – Calibration
Содержание STD32 VL-1225
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