Advantech PCI-1710HG Spécifications télécharger pdf (Page 109)

Appendix E

– 101 – PCI-1710 series User’s Manual

Advantech Co., Ltd.

www.advantech.com

Appendix

E. PCI-1716/1716L Calibration

(Manually)

E.1 A/D Calibration

Regular and proper calibration procedures ensure the maximum

possible accuracy. It is easy to complete the A/D calibration procedure

automatically (i.e. through software calibration) by executing the A/D

calibration program AutoCali. Therefore, it is not necessary to adjust

the hardware settings of the PCI-1716/1716L. However, the following

calibration steps are also provided for your reference in case manual

calibration is needed:

1. Adjust the on board reference voltage. First, adjust VR1 until the

reference voltage on TP4 has reached +5.0000 V. Next, to write

0x0080, 0x0180, 0x0280 and 0x0380 sequentially to Calibration

Command and Data register (BASE+18). After that, to set PCI-

1716/1716L to AI software trigger and calibration mode.

2. Adjust the PGA offset voltage. First, writing any value to BASE+9

to clear FIFO. Then to set A/D channel to channel 0.

3. Writing the value from 0x0200 to 0x02FF sequentially to Calibra-

tion Command and Data register (BASE+18), and get each

bipolar range’s data by software trigger A/D method. Be noted that

to repeat this procedure 1000 times then to average those data for

each value. After that, to compare the average data of the range

between ±5 V and ±0.625 V and to see whether the discrepancy is

less then 2 LSB. If so, to go to next step. Otherwise, you must

change the value and repeat all the procedure in this step again

until the discrepancy is less then 2 LSB.

4. Adjust the BIPOLAR offset voltage. First, writing any value to

BASE+9 to clear FIFO. Then to set A/D channel to channel 0, and

to set the range as -5 V to +5 V.

5. Writing the value from 0x0000 to 0x00FF sequentially to Calibra-

tion Command and Data register (BASE+18), and get each

bipolar range’s data by software trigger A/D method. Be noted that

to repeat this procedure 1000 times then to average those data for

each value. After that, to see whether the average data is close to

32767.5. If so, to go to next step. Otherwise, you must change the

value and repeat all the procedure in this step again until the

average data close to 32767.5.

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Advantech PCI-1710HG Spécifications Page 109