A COM Dynamic Link Library For Metrology Calculations

A COM Dynamic Link Library For Metrology Calculations

This paper describes a COM DLL library for metrology calculations.
A COM Dynamic Link Library (ActivX DLL) is a software program that responds to calls from other programs written in any language (under MS windows) and provides some services. This project encapsulates the functionality of two existing software programs, namely the Evaluator and Predictor into one DLL called MetroCom. The Evaluator and Predictor are stand-alone programs, which can estimate measurement uncertainties per ISO GUM or by Monte-Carlo simulation directly from the measurement equation, can estimate present value and uncertainty of a measurement standard and its uncertainty (based on past calibrations) and estimate recalibration intervals. Being stand-alone programs with their own file formats, prevented users, which already have metrology database systems, to benefit. This DLL solves this problem and enables any existing metrology database program to ask the DLL to do for it the required calculations. The existing programs, however, must add a function call to the DLL, which is relatively a simple task.
This paper will describe the methods and algorithms used by this DLL to achieve the required metrology tasks and the way some users have implemented the library.

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