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![Page 1: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/1.jpg)
1NCSLI Conference 2013
Inter-Laboratory Comparison Study Using Modular
Instrumentation and Lessons Learned
Author: Dimaries Nieves – National Instruments
Senior Metrology Engineer
Speaker: Jorge Martins – National InstrumentsPrincipal Metrology Engineer
![Page 2: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/2.jpg)
2NCSLI Conference 2013
Learning Objectives• How can we demonstrate performance and competence of modular instrumentation as part of metrology and accreditation process?
• Propose a process to perform an Inter-laboratory Comparison using a modular instruments.
• Standard Documents for ILC evaluation.
• Review some of the results and lessons learned.
![Page 3: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/3.jpg)
3NCSLI Conference 2013
• Inter-laboratory Comparison (ILC) is a key criterion for laboratory accreditation
• ILC is an important asset in:• Measurement Reliability• Measurement Assurance• Calibration Process Confidence• Measurement Method• Technician Proficiency
• There is no commercial proficiency testing available for Modular Instrumentation.
For the last two years, National Instruments performed an interlaboratory comparison using Modular Instrumentation as the primary standard
![Page 4: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/4.jpg)
4NCSLI Conference 2013
Modular Instruments
• Gradually taking an important role in test and measurement
• Enable more cost effective and flexible measurements
• Used in Research, Calibration, Validation and Production test
In metrology and laboratory accreditation process • Need to demonstrate performance
and competence performing regular calibration services.
![Page 5: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/5.jpg)
5NCSLI Conference 2013
NI Inter-Laboratory Comparison Proposal
• The ILC was designed based on:• NCSLI’s RP-15 • ASTM E691-13
• Unit was monitored using the petal or flower model
• NI Certified Calibration Centers were selected to participate
• NIC Metrology Laboratory serves as the pivot Laboratory
![Page 6: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/6.jpg)
6NCSLI Conference 2013
ILC Equipment Bias and Stability
• Stability of the reference unit was determined by the pivot Laboratory before starting the ILC process.
• No significant bias was found within the pivot measurements.
• The pivot laboratory monitor the performance of the unit to ensure that any unexpected changes in the traveling standard are promptly detected.
• Comparison of the pivot lab data showed that the unit remained in control throughout the all ILC.
![Page 7: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/7.jpg)
7NCSLI Conference 2013
ILC Reference Value
• Reference values were determined using the pivot lab measurements.
• All pivot runs were included in the analysis• Statistical Analysis of the data was performed
• Uncertainties reported by the pivot laboratory include ILC process bias and deviations.
![Page 8: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/8.jpg)
8NCSLI Conference 2013
First ILC Run
• NI PXI-4072 Flex DMM and LCR Meter (6 ½ digits DMM)
• NI Published Calibration Procedure
• “Verify Mode Only” procedure using NI’s calibration software, Calibration Executive
• Participants use their own chassis, standards, and cables to perform the measurements
•Report only one measurement result per point with an expanded uncertainty at 95% of confidence (k=2).
![Page 9: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/9.jpg)
9NCSLI Conference 2013
For Evaluation
An En value was calculated for each
measurement provided for each laboratory
![Page 10: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/10.jpg)
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NCSLI Conference 2013
Resistance Measurement Verification in 2-wire mode First ILC (2011)
![Page 11: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/11.jpg)
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Resistance Measurement Verification in 4-wire mode
First ILC (2011)
![Page 12: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/12.jpg)
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Second ILC Run• NI PXI-4072 FlexDMM and LCR Meter (6 ½ digits DMM) , Chassis and Cables (entire Setup).
• NI Published Calibration Procedure
• “Verify Mode Only” procedure using NI’s calibration software, Calibration Executive
• Performed three runs on the unit, doing a manual “Self Calibration” before each run
• Verify that the board temperature was stable at 35 ºC ± 2 ºC before performing the verification
•Report measurement result with an expanded uncertainty at 95% of confidence (k=2).
![Page 13: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/13.jpg)
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Resistance Measurement Verification in 2-wire mode Second ILC (2012)
Pivot
![Page 14: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/14.jpg)
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NCSLI Conference 2013
Resistance Measurement Verification in four-wire mode Second ILC (2012)
![Page 15: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/15.jpg)
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Additional Analysis
• Consistency Evaluation• Within the laboratory
• S = Standard Deviation for one laboratory• Sr = Repeatability standard deviation of the equipment
• p = Number of laboratories participating in the ILC
![Page 16: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/16.jpg)
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Additional Analysis
• Consistency Evaluation• Between Laboratory
• Where, = Lab average minus the average of the lab averages
• Where, Sx = Standard deviation of the lab averages
![Page 17: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/17.jpg)
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NCSLI Conference 2013
Within-laboratory consistency (k) for DC Voltage measurement Second ILC (2012)
![Page 18: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/18.jpg)
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NCSLI Conference 2013
Between-laboratory consistency (h) for DC Voltage measurement
Second ILC (2012)
![Page 19: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/19.jpg)
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Conclusion
• Modular Instruments meet the published measurement specifications, regardless of the combination of chassis, controller and measurement I/O.
• However, for an ILC the higher requirements for repeatability and reproducibility make it advantageous to provide, not just the instrument but, the entire measurement system.
• Including the entire system in the ILC reduces differences between participants, improving the correlation of data.
• Several statistical tools are needed
![Page 20: 1 NCSLI Conference 2013 Inter-Laboratory Comparison Study Using Modular Instrumentation and Lessons Learned Author:Dimaries Nieves – National Instruments.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d215503460f949f6068/html5/thumbnails/20.jpg)
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Questions?