Instrument Ground Detection for Multiple Earth Connections
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Solution Overview
Problem
Existing test and measurement systems often suffer from incorrect measurements due to unnoticed multiple connections to earth ground, which can be time-consuming and error-prone to resolve manually.
Innovation Solution
A system and method for automatically detecting and configuring system ground connections by connecting and disconnecting local grounds to earth ground, measuring connection quality for DC and AC voltages, and providing guidance or warnings for optimal grounding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple instruments are connected together in a test and measurement system, then measurement capability is improved, but multiple connections to earth ground are introduced resulting in incorrect measurements
Solution Approach 1:
The system automatically detects ground connection status by measuring impedance between local grounds and earth ground, then provides feedback to configure grounds correctly. The impedance measurement serves as feedback about the actual grounding state, enabling the system to identify and correct multiple ground connections automatically.
Solution Approach 2:
The system performs self-diagnosis and self-correction of grounding configurations by automatically measuring impedance and configuring ground connections without manual intervention. The test and measurement system itself serves to detect and fix its own grounding issues rather than requiring external manual checking.
2Measurement precision
If manual examination and measurements are performed to ensure proper grounding, then measurement accuracy is improved, but time consumption and error risk increase
Solution Approach 1:
The system automatically performs grounding detection and configuration without requiring manual examination. The automated impedance measurement and ground configuration eliminates the need for manual checking, reducing both time consumption and human error while maintaining grounding accuracy.
Solution Approach 2:
The system performs grounding detection and configuration automatically before measurements are taken. By pre-configuring the ground connections through automated impedance measurement and relay control, the system ensures proper grounding is established in advance without requiring manual verification later.
3Productivity
If automated ground detection and configuration is implemented, then configuration time is reduced, but system complexity increases
Solution Approach 1:
The system uses existing multi-functional components (relays for ground configuration, impedance measurement for detection) to achieve automated grounding. By leveraging components that already exist in the test and measurement system for other purposes, the solution avoids adding separate dedicated hardware while still achieving automation.
Solution Approach 2:
The system introduces an intermediary measurement process (impedance measurement between local grounds and earth ground) that mediates between the grounding configuration and the actual ground connection state. This intermediary measurement enables automated detection without requiring direct physical inspection or complex control mechanisms.
Data Source
AI summary
The present system includes an instrument configured to couple to a device under test, where the instrument is coupled to a local ground and an earth ground, the instrument having: a signal source; a relay coupled to the local ground; a impedance between the first signal source and the relay; and one or more processors configured to execute code that causes the one or more processors to: operate the relay to either connect or disconnect the earth ground to the local ground; measure quality of a first connection to the earth ground and quality of a second connection to the local ground using the instrument, the first signal source, and the first impedance; and determine whether to continue operating the relay to either keep the earth ground connected to or disconnected from the local ground based on the quality of the first connection and the quality of the second connection.