ICS AOB16/12, Product Manual

Page: 26 / 33

Manual Number: 00650-134-4 Page 17
Chapter 8: Calibration
Periodic calibration of the AOBx/12 cards are recommended if they are used in extreme environ-
mental conditions. The card uses very stable components but vibration, or high-low temperature
cycles might result in slight analog output errors.
Factory calibration and periodic calibration of the card includes adjustment of the internal reference
voltage unless you are using an external reference voltage.
The suggested sequence for calibration is:
a. Set base address for the card
b. Set range and polarity for each channel
c. Check the 5V Reference Voltage
d. Adjust Unipolar zero on each channel
e. Adjust Unipolar range of each channel
f. Adjust Bipolar negative full scale of each channel
g. Check Bipolar zero of each channel
h. Check Bipolar positive full scale of each channel
To calibrate the card, run the setup program and follow the screen prompts. No attempt at calibra-
tion should be made in noisy locations or with a noisy calibration setup.
Each DAC output is available between the AGND (analog ground) test point near the top right-
hand edge of the card (component side) and the Channel Test Point Pins located near each DAC
channel’s set of calibration potentiometers.
Note: After changing a channel’s voltage range or polarity, the channel may require recalibration
for best accuracy.