Measuring Device Electronics Clock Frequency Drift Verification
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Solution Overview
Problem
Conventional methods for verifying the measuring device electronics in industrial measurement systems require interrupting normal operations and using expensive, difficult-to-recalibrate test devices, which are typically only accessible to trained testers.
Innovation Solution
A measuring device with dual clock generators that independently produce reference clock signals with a fixed frequency relationship, allowing for on-board verification of clock frequency deviations and potential inaccuracies without interrupting operations, using a processor to determine if the clock frequencies deviate beyond specified limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional external test devices are used to verify measuring device electronics, then measurement accuracy can be checked, but normal operations must be interrupted and expensive specialized equipment is required
Solution Approach 1:
The measuring device performs self-verification using its own internal clock generators and processing unit. The device compares the working clock signal with reference clock signals generated by independent clock generators, enabling autonomous accuracy checks without external test equipment or operational interruption.
Solution Approach 2:
Independent reference clock generators serve as intermediary elements that provide known-good clock signals for comparison. These reference signals act as mediators between the working clock signal and the verification process, enabling indirect verification of measurement accuracy through frequency comparison.
2Measurement precision
If external test devices are used for verification, then measurement accuracy can be validated, but the test devices are expensive and difficult to recalibrate
Solution Approach 1:
The measuring device eliminates dependency on external test equipment by performing self-validation using its own integrated reference clock generators. The processing unit compares working clock signals against these internal reference signals, removing the need for expensive, specialized external verification equipment.
Solution Approach 2:
The device creates internal copies of clock signals through independent reference clock generators that replicate the function of external test equipment. These internal reference signals serve as substitutes for external test devices, providing the same verification capability without requiring external hardware.
3Reliability
If conventional verification methods are employed, then clock frequency deviations can be detected, but trained testers are required and verification is not regular
Solution Approach 1:
The processing unit autonomously performs frequency comparison between working clock signals and reference clock signals, generating verification results without human intervention. This self-verification capability eliminates the need for trained testers and enables regular automated checking during normal operation.
Solution Approach 2:
The system implements continuous feedback by constantly comparing working clock signals with reference signals and using the comparison results to verify measurement accuracy. This closed-loop verification process automatically detects frequency deviations and provides ongoing reliability assurance.
Data Source
Figure 1a~1b
Figure 2
Figure 3a
AI summary
A measuring device electronics comprises a processor and two clock signal generators. One clock signal generator serves for producing a working clock signal, and also for producing a reference clock signal which is dependant on the working clock signal. The other clock signal generator, serves for producing a second reference clock signal, which is independent of the working clock signal. Based on the two independent reference clock signals, a frequency difference, can, to the extent that such is present, be ascertained during operation of the measuring device electronics or of the measuring device formed therewith. The frequency difference, represents a difference between the instantaneous clocking frequency of the first reference clock signal and the instantaneous clocking frequency of the second reference clock signal, and, in this respect, represents a measure for a deviation of an instantaneous clocking frequency, from the nominally predetermined clocking frequency, of the working clock signal.