DA Converter Output Calibration Using Internal Reference Voltages
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Solution Overview
Problem
Equipment used for precise measurements, such as those required for disease tests and nondestructive inspections, experience performance degradation and measurement errors due to age-related deterioration and varying use conditions, necessitating improved accuracy and reliability.
Innovation Solution
A processing device incorporated in an output device that utilizes a DA converter to adjust the positive and negative output voltage values towards internal reference voltage values, thereby improving measurement accuracy by compensating for inherent errors in the equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If equipment is used for precise measurements over time, then measurement capability is maintained, but measurement accuracy deteriorates due to age-related deterioration and use conditions
Solution Approach 1:
The system performs preliminary calibration by storing reference voltage values before actual measurements. The calibration voltage values are stored in advance and used to correct measurement data, preventing accuracy deterioration from accumulating during operation.
Solution Approach 2:
The system continuously monitors measurements against stored reference voltage values and applies real-time correction. The measurement correction unit compares actual measurements with reference values and adjusts the measurement results accordingly, creating a closed-loop feedback system that maintains accuracy over time.
2Measurement precision
If calibration is performed frequently to maintain accuracy, then measurement precision is improved, but time consumption and operational complexity increase
Solution Approach 1:
Calibration data is captured and stored in advance during manufacturing or initial setup. This preliminary calibration eliminates the need for frequent recalibration operations, saving time during actual measurement operations while maintaining accuracy through the use of pre-stored reference values.
Solution Approach 2:
The system creates a copy of the reference voltage values and stores them in memory for repeated use. Instead of repeatedly performing the calibration process, the system copies the calibrated reference values and uses them multiple times, significantly reducing calibration time while maintaining measurement accuracy.
3Measurement precision
If reference voltage values are stored for correction, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The storage unit serves multiple functions: it stores reference voltage values for calibration, stores measurement data, and provides reference data for correction. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity while still enabling accurate measurement correction.
Solution Approach 2:
The reference voltage values act as an intermediary between the calibration process and measurement correction. Instead of directly comparing measurements with original calibration standards, the system uses stored reference values as an intermediate reference, simplifying the correction mechanism while maintaining accuracy.
Data Source
AI summary
A processing device is built into an output device, which uses a DA converter to output a predetermined voltage value serving as a reference. The processing device includes an input voltage acquisition unit, which acquires a positive reference voltage value and a negative reference voltage value output as internal reference voltage values from an internal voltage supply in the output device. An output voltage acquisition unit acquires a positive output voltage value and a negative output voltage value output from the DA converter. An adjustment unit adjusts a set value of the DA converter and adjusts the acquired positive output voltage value and negative output voltage value toward the acquired positive reference voltage value and negative reference voltage value.