ADLINK PCM-9112+ - Manual (Page 83)

Calibration • 75
6
Calibration
In data acquisition processes, how to calibrate your measurement devices to
maintain its accuracy is very important. Users can calibrate the analog input
and output channels under the users' operating environment to maximize the
accuracy. This chapter will guide you though how to calibrate the PCI-9112.
6.1 What do you need
Before calibrating your PCI-9112 card, you need to prepare the following
equipment’s and materials for the calibration process:
• Calibration program: Once the program is executed, it will guide you
through the calibration process. This program is included in the
delivered package.
• A 5 1/2 digit multimeter (6 1/2 is recommended)
• An adjustable voltage calibrator or a very stable and noise free DC
voltage generator. The calibrator should be able to provide voltage
accuracy of up to 1/2 LSB. In bipolar 5V input range mode (GAIN =
1), the voltage of 1/2 LSB is 1.22mV (i.e. (10V / 4096) / 2). When in
unipolar 1.25V input range (GAIN = 8), the voltage of 1/2 LSB is
0.153mV (i.e. (1.25V / 4096) / 2).