Analog input and output calibration method and device

Abstract

The invention discloses an analog input and output calibration method, which comprises the following steps of: detecting whether an analog loop on a module to be tested has a short-circuit or open-circuit state according to calibration configuration, and if the analog loop on the module to be tested has the short-circuit or open-circuit state, ending operation to obtain test data; and if the short circuit or open circuit state does not exist, the main control module carries out point-by-point calibration on channels one by one according to test configuration to obtain calibration data. An analog input and output calibration device is used for executing an analog input and output calibration method, and an MUX module is electrically connected with a module to be tested through a connector; the main control module is electrically connected with the MUX module through the mother board module, and the module to be tested is electrically connected with the main control module through the mother board module; and the main control module is electrically connected with the man-machine interface module through a control bus. According to the method, the measurement accuracy is improved, due to automatic operation of a program, more calibration and measurement points can be set, and the accuracy of the calibrated measurement output value can be correspondingly improved.

Description

technical field [0001] The invention relates to an analog input and output calibration method and an analog input and output calibration device, belonging to the technical field of electric power measurement and control. Background technique [0002] In the field of power measurement and control, sensors usually use DC voltage (current) signals to drive or output signals, and power equipment needs to have DC voltage (current) signal input (output) modules. In order to ensure the measurement or output accuracy, it is necessary to complete the DC signal input (output) accuracy calibration in the production test. [0003] Generally, the accuracy calibration test in production test is implemented by manual test and automatic test. Manual testing does not require the production of special test fixtures, and the cost is low, but the operation is complex and labor-intensive. Usually, in order to save time, only two points of zero drift and gain are calibrated, and the calibration ...

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