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Author: Gary Bennett – National Instruments Metrology Laboratory Manager

How to Achieve a 0.01 µV/V Deviation on Your 10 Vdc Proficiency Test Without using a Josephson Array. Author: Gary Bennett – National Instruments Metrology Laboratory Manager Speaker: Jorge Martins – National Instruments Principal Metrology Engineer. Learning Objectives.

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Author: Gary Bennett – National Instruments Metrology Laboratory Manager

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  1. How to Achieve a 0.01 µV/V Deviation on Your 10 Vdc Proficiency Test Without using a Josephson Array Author: Gary Bennett – National Instruments Metrology Laboratory Manager Speaker: Jorge Martins – National Instruments Principal Metrology Engineer

  2. Learning Objectives • Activities required to maintain a 10 Vdc reference standard • Tools available to make precision 10 Vdctransfer measurements • Overview of techniques to track measured values and project future values of precision standards

  3. Opportunity for Internal Support Need to perform artifact calibrations on Fluke 5720A to maintain the 90 day specifications • Purchased: • 4x 10 Vdc Reference Standards • Data Proof VoltRef SW and 160B scanner • Nanovoltmeter

  4. Requirements 10 Vdc uncertainty for calibrator adjustment is: ±1.5 µV/V 10 Vdc Reference Stability Specification

  5. Options • Expand the 90 day specification of the 57x0 as per mfg. manual • Shorten interval of 10 VdcZener references • Buy a 10 Vdc with history … that you can trust! • Devise a process to expedite the characterization of our Zener References

  6. Our Chosen Method • Calibrate all 4 using MAP program after six months. • Measure the travelling standard • Create procedure to measure the travelling standard • Review the previous 6 months of VoltRef data • Determine uncertainty • Measure all our 10 Vdc references against the travelling standard using the MAP provider’s procedure

  7. Measurements Prior to 2nd Calibration

  8. Result of 1st Proficiency Test

  9. What Happened?

  10. 2nd Calibration

  11. 2nd Calibration Results

  12. 3rd Calibration 2nd Proficiency Test

  13. 3rd Calibration, 2nd Proficiency Test

  14. Proficiency Test #2

  15. Projected Values and 3rd Calibration

  16. 3rd Calibration

  17. Proficiency Test #3

  18. 4th Calibration

  19. Proficiency Test #4

  20. 5th Calibration

  21. 5th Calibration Cell #1

  22. Uncertainty Components • Calibration Uncertainty (Travelling standard) • Atmospheric Pressure • Temperature • Noise • Type A Statistical • Uncertainty of Projected Value • Hysteresis Error

  23. Conclusion • VoltRef works very well with the proper drift information for each cell • Tools are available to make the data gathering less painful • Understanding the normal differences in performance of individual references is important • Gathering history on reference standards is expensive

  24. Questions

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