Advantech PCI-1710 Manual do Utilizador descarregar pdf (Página 51)

Chapter 5 Calibration 47

The following list shows the function of each VR:

VR Function

VR1 A/D unipolar offset

VR2 A/D bipolar offset

VR3 A/D full scale (gain)

VR4 D/A channel 0 full scale

VR5 D/A channel 1 full scale

5.3 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.

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 63 64

Sem comentários

Advantech PCI-1710 Manual do Utilizador Página 51