calibration and specification considerations when using modular instrumentation
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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Calibration and Specification Considerations
When Using Modular Instrumentation
Mike Dobbert
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Environmental ConditionsOperating SoftwareMulti-module Instruments
Modular Instruments
Configuration FlexibilityInterchangeabilityMeasurement SpeedSize
Traceable Measurements!(calibration required)
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Modules have neighbors.
Environmental Conditions
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Fixed Configuration.
Ambient environmental conditions are a good predictor of the internal operating conditions.
Environmental Conditions
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Environmental Conditions
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Calibration Laboratory
Ambient environmental conditions outside the chassis are not necessarily a good indication of the internal operating conditions!
Environmental Conditions
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Environmental Conditions
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Environmental Conditions
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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.
Operating Software
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Operating Software
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Set of modules working together as a single instrument.Instrument accuracy may depend on more than one module.
Multi-Module Instruments
Calibrate the multi-module instrument as a single instrument.Multi-module instruments require a unique identification(when calibrated as a set).
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Calibration Manager
Multi-Module Instruments
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Multi-Module Instruments
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Model multi-module instruments as a function of individual modules.
(GUM method of uncertainty propagation.)
Multi-Module Instruments
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Multi-Module Instruments
𝒚=𝒇 ( 𝒙𝟏 , 𝒙𝟐 ,𝒙𝟑 )
Tradeoff: modular flexibility versus accuracy.
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In-Situ Calibration
Address environment and controlling software issues.
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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.