Analysis of Direct Measurements
Analysis of Multivariate
Measurements
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The User Defined Error
Worksheet is the primary screen for analyzing
uncertainties for multivariate measurements.
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The model equation for
computing the parameter value of interest can contain up
to 1,000 root variables or quantities.
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Model equations can also
contain an unlimited number of nested variables, each
defined by a separate equation.
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Root variables and associated
uncertainties are analyzed via the Error Source
Uncertainty Worksheets.
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Sensitivity coefficients for
root variables are automatically computed via numerical
partial differentiation of the model equation.
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The user has the option of
entering sensitivity coefficient equations in lieu of
automatic partial differentiation.
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All equations are entered in
the extremely versatile and non-proprietary VB Script
format.
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Analysis of Measurement
Systems
Abundant On-Screen
Information
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The Analysis Guide Screen
provides a tree-view presentation of measurement
uncertainty analysis concepts and methods, program
features, operating procedures, analysis examples and
other topics.
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Interactive analysis procedure
checklists provide a short, structured walk-through of
the basic steps in estimating measurement uncertainty
for typical measurement scenarios.
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Major screens and worksheets
contain detailed procedures with hypertext links to
program functions.
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All screens and worksheets
contain context sensitive Info buttons.
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All screens and worksheets have
access to a full-featured on-screen Help with index,
content, and search capabilities for over 700 topics.
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Advanced Features
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Uncertainty Growth Projection
for the subject parameter under evaluation can be
estimated via the Reliability Model Worksheet.
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The SMPC Analysis Screen can be
used to obtain the best estimates of both the subject
parameter and measuring parameter values using Bayesian
methods.
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The Sample Statistics Screen
can be used to compute Statistics for Selected Cells
(i.e., sample subset), test for and Remove Outlier Data,
and to conduct Normality Testing.
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The built-in Type B Degrees of
Freedom Calculator provides a useful tool for estimating
the degrees of freedom for heuristic (i.e.,
non-statistical) measurement uncertainty estimates.
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The SpecMaster Worksheet
provides a powerful tool for determining tolerances for
parameters with complex specifications.
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The built-in Measurement Units
Database contains over eighty measurement areas and
several hundred units in compliance with NIST Special
Publication 811. Nearly two dozen new measurement areas
and a hundred units have been added to facilitate
working with specifications for wide range of
measurement and test equipment.
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The built-in Instrument
Database can be used for storing and retrieving
instrument and parameter specifications.
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External Windows applications
can be run from within UncertaintyAnalyzer via the Run
External Application Screen.
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UncertaintyAnalyzer also
fully integrates with other ISG applications for
enhanced measurement analysis capability, including the
ability to import Uncertainty Sidekick Pro files.
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Data Importing
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Drill-down Worksheets
for Analyzing Measurement Process Errors
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Parameter Bias Uncertainty
Worksheets for estimating measurement uncertainty due to
measuring and/or subject parameter bias.
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Measurement Data Entry
Worksheets for estimating measurement uncertainty due to
measuring and/or subject parameter random
(repeatability) error.
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Parameter Resolution Error
Worksheets for estimating measurement uncertainty due to
measuring and/or subject parameter resolution error.
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Operator Bias Uncertainty
Worksheet for estimating measurement uncertainty due to
operator bias.
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Digital Sampling Uncertainty
Worksheet for estimating measurement uncertainty due to
analog-to-digital and/or digital-to-analog signal
conversion.
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Computation Error Uncertainty
Worksheet for estimating measurement uncertainty due to
computation error.
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Environmental Factors
Uncertainty Worksheet for estimating measurement
uncertainty due to environmental factors.
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Stress Response Uncertainty
Worksheet for estimating measurement uncertainty due to
shipping and handling stress.
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User Defined Error Worksheet
for estimating measurement uncertainty due to other user
defined errors.
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Analysis of Type A,
Type B and Type A,B Estimates
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The measurement uncertainty
estimate type is automatically determined based on user
data entry.
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Degrees of freedom are computed
for all measurement uncertainty estimate types.
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Type B error limits can be
computed as a linear or root-sum-square (RSS)
combination of a fixed value, % of nominal or reading, %
of full scale, and % of range or other components.
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Measurement uncertainty
estimates and associated statistics for User Defined
Errors can be imported from other UncertaintyAnalyzer
files via the Error Source Uncertainty Worksheets.
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The Copy Error Source function
also allows users to copy information from one Error
Source Uncertainty Worksheet to another to reduce
duplication of data entry in cases where two or more
error sources are similar.
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Measurement Configuration
Options
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Users can choose from a list of
measurement configurations via the Measurement
Configurations Screen.
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Selecting a measurement
configuration instructs UncertaintyAnalyzer to
de-activate screens and worksheets that are not required
for the measurement uncertainty analysis.
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Selecting a measurement
configuration also instructs UncertaintyAnalyzer to
activate special analysis screens, where appropriate.
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Correlation of Error
Sources
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All error sources are assumed
to be uncorrelated unless otherwise specified by the
user.
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The Correlation Analysis Screen
assists the user in establishing correlations between
error sources.
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Correlation coefficients can be
entered directly or computed from data pairs.
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Correlation coefficients are
automatically included in the computation of the total,
combined measurement uncertainty.
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Notes Pages for All
Analysis Levels
Analysis Description
Screen
Charts and Plots
Comprehensive Analysis
Reports
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