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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
饾挌=饾拠 ( 饾挋饾煆 , 饾挋饾煇 ,饾挋饾煈 )
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.