Modular self-diagnostic detector

Abstract

The invention discloses a modular combination detector with automatic fault diagnosis function, which can selectively complete the measurement of temperature, stress, acceleration, non-contact voltage and current. The front-end detection module is connected with the A / D converter, the A / D converter is connected with the DSP, and the DSP circuit is connected with the power management circuit, the display and the keyboard respectively. The self-diagnosis combined detection instrument of the present invention can not only detect the measured signal in real time through the selection and / or combination of different front-end detection modules, but also judge whether its own module is faulty through the fault point information on each detection module , as well as the cause, time, and location of the fault, and close the corresponding circuit to avoid the expansion of the fault. At the same time, a fault alarm is issued to prompt the fault solution.

Description

technical field [0001] The invention relates to a DSP-based modular self-diagnosis series combination detector, which has a fault self-diagnosis function, takes DSP information processing and control as the core, and can perform modular detection of combined temperature, stress, acceleration, non-contact Detection of voltage and current measurement. Background technique [0002] Commonly used digital detection instruments for physical quantities are basically composed of front-end analog signal detection circuits, A / D conversion circuits, CPU digital signal processing circuits, and auxiliary man-machine interface circuits. Since the processing content of the CPU digital signal processing circuit is programmable and the input and output human-machine interfaces are compatible, the real difference between these testing instruments is only the front-end analog signal detection part. These features provide conditions for modular multifunctional combined signal testing instrument...

AI Technical Summary

Problems solved by technology

[0003] Generally, testing instruments do not have the function of fault self-diagnosis, and can only judge the working status of the instrument through the accuracy of the testing data. Often, only when there is an obvious error in the testing result, can the instrument be found to be faulty. However, the location and time of the fault are unknown. It is impossible to know for sure, this is a potential adverse effect on the correctness and reliability of the user's detection data. If the change of the detection data is not obvious, the user will mistake the wrong detection data for the correct data, thus affecting the normal operation of the user. work, especially in the detection of important equipment, these invisible effects may cause major accident hazards

Images