Memory-Based Test Fixture for One-Connect Instrument Calibration
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Solution Overview
Problem
Current calibration methods for test and measurement instruments require elaborate setups with multiple reconnections, leading to errors and high costs, making them inaccurate and inefficient.
Innovation Solution
A test fixture with a memory for storing fixture data and a calibration device that generates calibration signals considering fixture characteristics, allowing for a 'one-time connect' calibration process without reconnections, thus improving precision and reducing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple reconnections are used during calibration, then calibration can be performed with existing equipment, but calibration accuracy deteriorates due to connection errors
Solution Approach 1:
The test fixture stores calibration data in its memory before the actual measurement. The fixture data including frequency response, time delay, and skew is pre-characterized and stored, so that when calibration is needed, the data is already available and no reconnections are required. This preliminary storage of calibration information eliminates connection errors while maintaining calibration accuracy.
Solution Approach 2:
The test fixture acts as an intermediary between the calibration device and the measurement instrument. It receives calibration signals from the calibration device, processes them through its known characteristics, and provides corrected measurement data. The fixture's memory stores its own calibration characteristics, allowing it to compensate for its own effects without requiring direct reconnections during calibration.
2Measurement precision
If elaborate calibration setups with multiple reconnections are used, then calibration can be performed, but time consumption increases and productivity decreases
Solution Approach 1:
The test fixture is pre-characterized and its calibration data is stored in memory during manufacturing or initial setup. This preliminary action eliminates the need for time-consuming reconnections during subsequent calibration operations, allowing for rapid one-time connect calibration while maintaining high precision.
Solution Approach 2:
Once the test fixture is connected, the calibration process continues without interruption or reconnection. The fixture uses its stored memory data to provide continuous calibration information throughout the measurement process, eliminating the discontinuities and delays associated with multiple reconnections and maximizing calibration efficiency.
3Measurement precision
If additional measurement equipment like vector network analyzer is used, then calibration accuracy improves, but device complexity and cost increase
Solution Approach 1:
The test fixture performs self-calibration by using its own stored calibration data in its memory. Instead of requiring external complex equipment like vector network analyzers, the fixture leverages its pre-characterized properties to provide accurate calibration. This self-service approach reduces equipment complexity while maintaining calibration accuracy.
Solution Approach 2:
The test fixture serves as an intermediary that simplifies the calibration process. It receives calibration signals from simple calibration devices, processes them through its known characteristics stored in memory, and provides accurate calibration data without requiring complex external equipment. The fixture mediates between simple calibration hardware and the measurement instrument, achieving accuracy without complexity.
Data Source
AI summary
The present disclosure relates to a test fixture for being connected to a calibration device for calibrating a test and/or measurement instrument. The test fixture includes a probing point configured to receive a calibration signal while being in contact with a probe. The test fixture has a memory configured to store fixture data related to the probing point. Further, a calibration setup and a method of calibrating a test and/or measurement instrument are described.