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Calibration and Specification Considerations When Using Modular Instrumentation

Calibration and Specification Considerations When Using Modular Instrumentation. Mike Dobbert. Modular Instruments. Configuration Flexibility Interchangeability Measurement Speed Size. Traceable Measurements! (calibration required). Environmental Conditions Operating Software

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Calibration and Specification Considerations When Using Modular Instrumentation

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  1. Calibration and Specification ConsiderationsWhen Using Modular Instrumentation Mike Dobbert

  2. Modular Instruments Configuration Flexibility Interchangeability Measurement Speed Size Traceable Measurements!(calibration required) Environmental Conditions Operating Software Multi-module Instruments

  3. Environmental Conditions Modules have neighbors.

  4. Environmental Conditions Fixed Configuration. Ambient environmental conditions are a good predictor of the internal operating conditions.

  5. Environmental Conditions

  6. Environmental Conditions Calibration Laboratory Ambient environmental conditions outside the chassis are not necessarily a good indication of the internal operating conditions!

  7. Environmental Conditions

  8. Environmental Conditions

  9. Operating Software Instrument Drivers (reside outside the module) Installed Drivers at the Calibration Laboratory Ideally, the same software driver revision is used for both calibration and during intended operation.

  10. Operating Software

  11. Multi-Module Instruments Calibrate the multi-module instrument as a single instrument. Multi-module instruments require a unique identification(when calibrated as a set). Set of modules working together as a single instrument. Instrument accuracy may depend on more than one module.

  12. Multi-Module Instruments Calibration Manager

  13. Multi-Module Instruments

  14. Multi-Module Instruments Model multi-module instruments as a function of individual modules. (GUM method of uncertainty propagation.)

  15. Multi-Module Instruments Tradeoff: modular flexibility versus accuracy.

  16. In-Situ Calibration Address environment and controlling software issues.

  17. Conclusion • Environmental Conditions • Module environment highly dependent on system configuration. • Operating Software • Instrument driver resides outside the module. • Multi-module Instruments • Calibration of a set of modules. • Calibration of individual modules utilizing the method of the GUM.

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