Current Interface Converter Circuit for Self-Testing Calibration
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Solution Overview
Problem
Traditional measuring device electronics require manual intervention and external test equipment to check the current interface, leading to interruptions in normal operations and high costs, as well as significant manual handling and technical efforts for calibration and realignment.
Innovation Solution
A converter circuit with a current interface and microprocessor that allows for on-board testing of the current interface, enabling checks without manual intervention or external equipment, and automatically adjusts amperage levels to detect deviations and compensate for changes in the characteristic curve function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual intervention and external test equipment are used to check the current interface, then measurement accuracy can be verified, but operational interruptions occur and costs increase
Solution Approach 1:
The converter circuit performs self-testing by using its own microprocessor to generate test control values, measure the resulting current values through its own ADC, and detect deviations in its characteristic curve function without requiring external test equipment or manual intervention
Solution Approach 2:
The system implements feedback by continuously monitoring the relationship between control values and actual current values, detecting deviations from the expected characteristic curve, and automatically compensating for changes to maintain measurement accuracy
2Measurement precision
If manual checking and calibration of the current interface is performed, then measurement accuracy can be maintained, but manual handling effort and technical requirements increase
Solution Approach 1:
The converter circuit automatically performs calibration and realignment by detecting deviations in its characteristic curve function and adjusting its operation to compensate for changes, eliminating the need for manual calibration procedures and reducing technical requirements for maintenance personnel
Solution Approach 2:
The system performs preliminary self-checks and automatic realignment before measurement accuracy deteriorates significantly, preventing the need for complex manual calibration procedures by maintaining accuracy through continuous automatic adjustment
3Reliability
If the current interface is checked regularly with external equipment, then deviations can be detected, but calibration intervals are limited by manual intervention requirements
Solution Approach 1:
The self-testing capability operates continuously during normal converter circuit operation, allowing deviation detection without interrupting measurement functions and enabling extended calibration intervals through ongoing automatic monitoring
Solution Approach 2:
The continuous feedback mechanism monitors the characteristic curve function in real-time, detecting deviations immediately when they occur and triggering automatic realignment, thereby extending the effective calibration interval while maintaining reliability
Data Source
AI summary
A converter circuit includes a current interface with a control input, with a current signal output and a current output. The converter circuit includes a micro-processor with a measuring signal input for the digital measuring signal, with a current signal input connected to the current signal output of the current interface, and with a control output connected to the control input of the current interface. The current interface lets the signal current flow through the current output and simultaneously adjust both the amperage to a stationary amperage level corresponding to a control value currently applied to the control input, and to output a sequence of current values at the current signal output. The micro-processor is designed to generate a measuring value sequence on the basis of the digital measuring signal and use it as the basis from which to generate a control value sequence and issue it at the control output as well as to monitor and/or check the current interface using the control value sequence and the current value sequence.