Advantech PCI-1710HG Spécifications télécharger pdf (Page 75)

D/A Calibration (for PCI-1710/1710HG only)

In a way similar to the ADCAL.EXE program, the DACAL.EXE

program leads you through the whole D/A calibration procedure.

You can either use the on-board -5 V (-10 V) internal reference

voltage or use an external reference. If you use an external reference,

connect a reference voltage within the range ±10 V to the reference

input of the D/A output channel you want to calibrate. Adjust the full

scale (gain) of D/A channel 0 and 1, with VR4 and VR5 respectively.

Note:

Using a precision voltmeter to calibrate the D/A outputs is recommended.

Set the D/A data register to 4095 and adjust VR3 until the D/A

output voltage equals the reference voltage minus 1 LSB, but with

the opposite sign. For example, if V

ref

is -5 V, then V

out

should be

+4.9959 V. If V

ref

is -10 V, V

out

should be +9.9918 V.

Self A/D Calibration

Under many conditions, it is difficult to find a good enough DC

voltage source for A/D calibration. There is a simple method to solve

this problem. First, you should calibrate D/A channel 0, DA0_OUT,

with internal reference -5 V, and D/A channel 1, DA1_OUT, with

reference -10 V.

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Advantech PCI-1710HG Spécifications Page 75