Device and method for automatic calibrating in water treatment analog data collecting system

Abstract

The invention belongs to the field of industrial process control, and particularly relates to a device and a method for automatic calibrating in a water treatment analog data collecting system, which solves the problems that the existing calibrating method for the water treatment analog data collecting system has big error, can't meet industrial standard, is complicated to operate, and is poorly universal. The automatic calibrating device includes a single chip control module, a DA conversion module, a VI transformation module, an LCD module, a keyboard input module and an analog input interface module. The calibrating method based on the device is that: the single chip control module controls the DA conversion module and the VI transformation module to form a standard current signal for the analog input interface module, the analog input interface module completes the communication between a to-be-calibrated analog input integrated circuit board and the single chip control module, soas to perform the data exchange between the analog input integrated circuit board and the single chip control module, the analog input integrated circuit board is calibrated under the control of the single chip control module as per the industrial standard current signal provided by the single chip control module, and the calibration error coefficient is stored.

Description

technical field

[0001] The invention relates to an automatic calibration device and method for a water treatment analog data acquisition system, belonging to the field of industrial process control. Background technique

[0002] In the industrial field, most sensors output a standard 4mA-20mA current signal. If the analog data acquisition system is not calibrated, the error of the data acquisition system in the circuit will affect the measurement accuracy of the sensor. The analog data acquisition system must be checked before use. to calibrate. At present, the data calibration methods of the analog signal acquisition system include software calibration, hardware semi-automatic calibration, and fully automatic calibration.

[0003] Although the software calibration method is relatively simple in principle, it is not universal. After replacing the board, it must be recalibrated, which is a heavy workload. At the same time, the calibration error cannot be seen intuitively aft...

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