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The Use of Hardware Abstraction Layers in Automated Calibration

Systems

Speaker/Author: Paul Packebush

Metrology Group Manager

Author: Rishee Bhatt

Staff Calibration Engineer

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Agenda

• Where to find software in calibration systems• Instrument Control• Hardware Abstraction Layers

• Industry-Standard• Vendor-Defined• User-Defined

• HAL Architecture• Object-Oriented Design• Pitfalls• Questions

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Software In Calibration Systems

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Instrument Control

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Instrument Service Life

Service Disruptions

• Obsolescence• External

calibration• Hardware

failure

Strategies

• Spare instrumentation

• Software modification

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Hardware Abstraction Layers (HALs)

• Layer between hardware and software• Used in modern operating systems• Standardizes interaction with different hardware architectures

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Hardware Abstraction Layers (HALs)

Industry-Standard

Vendor-Defined

User-Defined

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User-Defined HAL Architecture

10

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Decoupling

11

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Object-Oriented Design

14

Player

Hand

Score

12

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Inheritance & Dynamic-Dispatch

13

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Drop-In Replacement

Functionality Concerns

• Does the instrument support the functionality needed?

Accuracy Concerns

• Does the instrument provide the necessary level of accuracy?

14

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Summary

• Benefits of a HAL• Decoupling• Dynamic Instrument Interchangeability

• Object-Oriented Design• Inheritance• Dynamic Dispatch

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Questions?