Measurement Computing PCIe-DAS1602/16 - Manual (Page 15)

PCIe-DAS1602/16 User's Guide Installing the PCIe-DAS1602/16
15
Mechanical drawing
Figure 17. PCIe-DAS1602/16 circuit board dimensions (inches)
Calibrating
Required equipment
To calibrate the PCIe-DAS1602/16, a precision (or non-precision) voltage source, a 5½ digit digital voltmeter
and a few pieces of wire are required. Use a jeweler’s screwdriver to adjust the trim pots. An extender card is
not required to calibrate the board.
Field calibration
The PCIe-DAS1602/16 is shipped fully calibrated from the factory, and supports field calibration. For normal
environments, you should calibrate your PCIe-DAS1602/16 every six months to a year using InstaCal.
Calibrating with InstaCal takes less than 20 minutes.
You calibrate the A/D converters by applying a known voltage to an analog input channel and adjusting trim
pots for offset and gain. Three trim pots require adjustment to calibrate the analog input section of the board.
There are also three pots associated with each of the analog output channels.
Calibrate the PCIe-DAS1602/16 for the range you intend to use it in. When the range is changed, slight
variation in zero and full scale may result. These variations can be measured and removed in software if
necessary.
If frequent variations in temperature or humidity are common, recalibrate at least every three months. Refer to
the Quick Start Guide that shipped with your board for information about InstaCal.
Factory calibration
The Measurement Computing Manufacturing Test department performs the initial factory calibration. Contact
Measurement Computing for details about how to return your device and have it calibrated to the factory
specifications.
Programming and developing applications
You can program and develop applications for the PCIe-DAS1602/16 using the Universal Library and InstaCal
software. Refer to the Quick Start Guide for information about this software.