Measurement Computing PCIM-DAS1602/16 - Manual (Page 20)

Chapter 4
Calibrating the PCIM-DAS1602/16
The PCIM-DAS1602/16 is shipped fully calibrated from the factory. For normal environments, you should
calibrate your PCIM-DAS1602/16 board using InstaCal's calibration procedures every six months–to-a year. If
frequent variations in temperature or humidity are common, recalibrate at least every three months. It requires
less than 20 minutes to calibrate the board using InstaCal.
The InstaCal calibration procedure is explained in the DAQ Software Quick Start that was shipped with your
board.
Calibrating the A/D & D/A converters
InstaCal provides step-by-step on-screen instructions to guide you in calibrating your board. You calibrate the
board's A/D converters by applying a known voltage to an analog input channel and adjusting trim pots for
offset and gain. There are three trim pots that 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 PCIM-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.
Required equipment
To calibrate the PCIM-DAS1602/16, you need a precision voltage source, or a non precision source and a 5½
digit digital voltmeter and a few pieces of wire. Use a jeweler’s screwdriver to adjust the trim pots. An extender
card is not required to calibrate the board.
4-1