B&B Electronics PCI-1711 - Manual - Manual (Page 51)

Chapter 5
– 43 – PCI-1710 series User’s Manual Advantech Co., Ltd.
www.advantech.com
Self A/D Calibration
We know, in most cases, it is difficult to find a good enough DC
voltage source for A/D calibration. We provide a self-adjusted A/D
calibration program “SELFCAL.EXE” to help solve this problem. The
steps of self-calibration are outlined as below:
1. Connect DA0_OUT to AI0.
2. Connect AGND to AI1, AI2, AI3, AI4 and AI5.
3. Run the SELFCAL.EXE program.
4. First calibrate the D/A channel. Adjust VR3 until the DA0_OUT
output voltage approaches +10V. Then press the SPACE key.
5. Next we will do the A/D calibration. Now the DA0_OUT output
voltage will be +9.995V, then adjust VR2 until the output codes from
the card’s AI0 focused on FFE (at least 70%) and adjust VR1 until
the output codes from the card’s AI1, AI2, AI3, AI4 and AI5
focused on 7FF (at least 70%).
6. Press the SPACE key to finish calibration procedures.
5.3 PCI-1716/1716L Calibration
A calibration utility, AutoCali, is included on the companion CD-ROM :
AutoCali.EXE PCI-1716/1716L calibration utility
This calibration utility is designed for the Microsoft©Windows™
environment. Access this program from the default location:
C:\Program Files\Advantech\ADSAPI\Utility\Auto Calibration
VR Assignment
There is one variable resistor (VR1) on the PCI-1716/1716L to adjust
the accurate reference voltage on the PCI-1716/1716L. We have
provided a test point (See TP4 in Figure 5-3) for you to check the
reference voltage on board. Before you start to calibrate A/D and D/A
channels, please adjust VR1 until the reference voltage on TP4 has
reached +5.0000 V. Figure 5-3 shows the locations of VR1 and TP4.