Maintence and Troubleshooting
Unipro 3.5
Calibration Procedures
The UNIPRO instrument is shipped completely precalibrated. The drift characteristics of the input circuits are excellent but from time to time adjustment may be necessary in order to maintain high accuracy.
Analog Input Calibration. There are three analog inputs and a cold junction compensation sensor on the
UNIPRO. The input level and input features for each input are determined by changeable daughter boards that are mounted piggy back on the analog input board. There are several types of input daughter boards: thermocouple input, auxiliary input, 4 to 20 mA input, 0 to 10 V linear, RTD, and slide wire input.
The standard factory configuration is for input A to be a thermocouple input, input B to be an Oxygen probe input(auxiliary input) board, and input C to be a slidewire feedback input. If the instrument to be calibrated does not have the standard factory configuration, then identifying the configuration is necessary so that the proper procedure for each input board can be followed.
Calibration Displays And Keyboard
When operating in the calibration mode, the displays and front panel keys take on special assignments. The PROCESS display shows the value of the input being calibrated with a flashing digit. This flashing digit shows the relative sensitivity of the arrow keys, as
Rev. 11.00
December 30, 1995
