Calibration Apparatus with Switched Verification for Uncertainty Analysis
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Solution Overview
Problem
Existing calibration methods for measuring devices like vector network analyzers fail to accurately account for measurement uncertainties, leading to unreliable results due to inaccurately calculated uncertainties that do not consider individual device and setup specifics.
Innovation Solution
A calibration apparatus with a calibration device and verification device, utilizing multiple calibration and verification standards with predefined impedances, allows for accurate calibration and verification, enabling the determination of measurement uncertainties through directivity, source-match, and reflection tracking, and displaying uncertainties visually for user understanding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If theoretical calculation of measurement uncertainty is performed, then measurement uncertainty is displayed, but the calculated uncertainty is inaccurate and does not account for individual device and setup specifics
Solution Approach 1:
The system is divided into two separate functional units: a calibration unit for calibrating the measuring device and a verification unit for verifying the calibration. This segmentation allows each unit to specialize in its function, with the verification unit using traceable standards to provide accurate uncertainty determination without complicating the calibration process.
Solution Approach 2:
A switch is introduced as an intermediary component that controls the connection between the measuring device, calibration unit, and verification unit. This intermediary enables flexible switching between calibration and verification modes, allowing accurate uncertainty measurement without requiring permanent complex circuitry.
2Measurement precision
If calibration is performed using multiple calibration standards, then calibration accuracy is improved, but the system complexity increases
Solution Approach 1:
The calibration system uses three or more different calibration standards (through connection, short circuit, open circuit) connected via a switch. This segmentation allows the system to use multiple standards for accurate calibration while keeping the physical setup manageable through systematic switching between standards.
3Measurement precision
If verification is performed using traceable standards with predefined impedances, then measurement uncertainty determination accuracy is improved, but the verification setup becomes more complex
Solution Approach 1:
The verification unit uses traceable standards with predefined impedance values (e.g., 50 ohms, 75 ohms, 100 ohms) that are known with high accuracy. By changing the impedance parameter of the verification standards, the system can determine measurement uncertainty accurately without requiring complex verification circuitry.
4Adaptability or versatility
If a switch is added to connect the measurement device to both calibration and verification units, then calibration and verification can be performed sequentially, but the system complexity increases
Solution Approach 1:
The switch serves multiple functions: it connects the measuring device to either the calibration unit or the verification unit, and it can sequentially switch between different calibration standards and verification standards. This multi-functionality reduces the need for separate switching mechanisms for each operation.
Data Source
AI summary
A calibration apparatus, for calibration of a measurement device, is provided. The calibration apparatus includes a calibration device configured to calibrate the measurement device. The calibration device also includes a verificationH device configured to verify the calibration of the measurement device. The calibration device also includes a switch configured to switch between a connection of the measurement device to the calibration device and a connection of the measurement device to the verification device.