Appendix C Analog Input and Output Calibration Procedures
C.1 UDAS Analog Input Circuit Calibration
Procedures
The analog input section of each UDAS unit is calibrated at the factory prior to shipment. If your application requires periodic calibration checks or if inaccuracies occur, use the procedures below to calibrate the UDAS unit. This calibration is accomplished by the adjustment of potentiometers on the UDAS unit’s printed circuit board.
This calibration procedure requires the utility software provided with the unit, or some other software such as Visual Designer for displaying the Analog to Digital converter (A/D) results in counts format and for setting required gains and ranges.
Equipment Required:
•Precision voltmeter accurate to 100µV over a range of ±10 V.
•Precision voltage calibrator accurate to 1.0µV over a range of ±1 V and accurate to 100µV over a range of ±10 V.
•Termination panel for connecting signals and test instruments. A termination panel is built in to models
•1.4 mm
•#1 Phillips screwdriver for opening the unit’s case.
•USB equipped host computer.
CAUTION:
Static sensitive device warning! To avoid damage to the unit from static electricity, always use proper static protective procedures (such as use of a grounded wrist strap) when handling or adjusting this device.
C.1.1 Removing the UDAS Unit’s Cover
1.Disconnect the unit from the host computer or any external power supply.
2.Using a #1 Phillips screw driver, remove the two small screws at the far left and right ends of the unit’s front panel next to the USB and power connectors.
3.Remove the front panel, then slide the case cover towards the front of the unit.