Specifications

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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.EXE. 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
Calibration 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