Multi-Range Measurement Apparatus Auto-Zero Multiplexer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multi-range measurement apparatuses require repetitive calibration for each range, which is time-consuming and inefficient, especially when switching between measurement ranges.
Innovation Solution
A measurement apparatus with an input stage, output stage, and multiplexer that allows for a single calibration process to be shared across all measurement ranges, using a multiplexer to couple a reference signal to the output stage for calibration and selecting gain stages for measurement, enabling faster range switching and offset error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each range of a multi-range measurement apparatus is calibrated independently and serially, then calibration accuracy for each range is ensured, but calibration time increases significantly
Solution Approach 1:
The patent merges the calibration processes of multiple measurement ranges into a single simultaneous calibration operation. By using a multiplexer to connect a common calibration source to all ranges at once, and performing parallel calibration measurements, the system achieves calibration for all ranges in one operation rather than sequentially, thereby reducing total calibration time while maintaining accuracy through the use of a shared reference standard.
Solution Approach 2:
The patent implements a universal calibration approach where a single calibration source and set of calibration procedures serve multiple measurement ranges simultaneously. The multiplexer enables one calibration source to be dynamically connected to different ranges, and the calibration process is designed to characterize offsets for all ranges using a unified methodology, making the calibration system multi-functional rather than requiring separate calibration paths for each range.
2Measurement precision
If repetitive calibration is performed for each range switching, then measurement accuracy is maintained, but measurement efficiency decreases
Solution Approach 1:
The patent performs preliminary calibration for all measurement ranges simultaneously before actual measurements begin. By establishing the offset characteristics of all ranges in advance through a single calibration operation, the system eliminates the need for repeated calibration when switching between ranges during measurement, thereby maintaining accuracy while significantly improving measurement efficiency and reducing idle time.
Solution Approach 2:
The patent enables continuous measurement operations across range switches by establishing a one-time calibration that remains valid for all ranges. The multiplexer allows seamless switching between ranges without interrupting the measurement workflow for additional calibration, maintaining the continuity of useful measurement action rather than breaking it with repeated calibration cycles.
Data Source
AI summary
In one embodiment, a measurement apparatus has an input stage, an output stage and a multiplexer. The input stage has a signal input, a plurality of measurement range outputs, and a plurality of selectable gain stages, with each of the selectable gain stages being coupled between the signal input and a respective one of the measurement range outputs. The output stage has a measurement acquisition path between an analog measurement input and a digital measurement output. The measurement acquisition path includes an analog-to-digital converter. The multiplexer has i) a plurality of data inputs, at least two of which are coupled to respective ones of the plurality of measurement range outputs, and at least one of which is a reference input configured to receive a signal to which signals appearing at the measurement range outputs are commonly referenced, ii) a data output coupled to the analog measurement input of the output stage, and iii) a control input.