Advantech PCI-1710HG Spécifications télécharger pdf (Page 74)

A/D Calibration

Regular and accurate calibration procedures ensure the maximum

possible accuracy. The ADCAL.EXE calibration program leads you

through the whole A/D offset and gain adjustment procedure. The

basic steps are outlined below:

1. Set analog input channel AI0 as single-ended, bipolar, range ±5 V,

and set AI1 as single-ended, unipolar, range 0 to 10 V.

2. Connect a DC voltage source with value equal to 0.5 LSB

(-4.9959 V) to AI0.

3. Adjust VR2 until the output codes from the card's AI0 flickers

between 0 and 1.

4. Connect a DC voltage source with a value of 4094.5 LSB

(4.9953 V) to AI0.

5. Adjust VR3 until the output codes from the card's AI0 flickers

between 4094 and 4095.

6. Repeat step 2 to step 5, adjusting VR2 and VR3.

7. Connect a DC voltage source with value equal to 0.5 LSB (1.22

mV) to AI1.

8. Adjust VR1 until the output codes from the card's AI1 flickers

between 0 and 1.

A/D code Mapping Voltage

Hex. Dec. Bipolar ±5V Unipolar 0 to 10V

000h 0 -4.9971 V 0 V

7FFh 2047 -0.0024 V 4.9947 V

800h 2048 0 V 4.9971 V

FFFh 4095 4.9947 V 9.9918 V

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Advantech PCI-1710HG Spécifications Page 74