Summary of Accuracy Determinations for Four Mechanical Balances

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Summary of Accuracy Determinations for Four Mechanical Balances

by David W. Davenport, 13 FEB-2000

Accuracy Summary for Three "Pocket" Mechanical Scales—Accura, Calibrön and Deering 10

Conclusions: The Accura Scale is highly accurate and shows excellent linearity across its entire range. Practically, it has the following accuracy limits:

Conclusions: The Calibrön Scale is highly accurate and shows excellent linearity across its entire range. Practically, it has the following accuracy limits:

Conclusions: The Deering 10 Gram Scale is highly accurate and shows excellent linearity across its entire range. Practically, it has the following accuracy limits:

Mass Range

Accuracy

Mass Range

Accuracy

Mass Range

Accuracy

</= 1.00 gram
>1.00 gram

± 0.025 gram
± 2.8%

</= 1.00 gram
>1.00 gram

± 0.0125 gram
± 1.25%

</= 1.00 gram
>1.00 gram

± 0.01 gram
± 1.5%

Download the complete detailed report for the Accura Scale

Download the complete detailed report for the Calibrön Scale

Download the complete detailed report for the Deering 10 Gram Scale

Accuracy Summary for One Laboratory-Quality
Mechanical Bench Scale—Ohaus 310 Model

Conclusions: The Ohaus Dial-O-Gram 310 Model scale is highly accurate and shows excellent linearity across its entire range. Practically, it has the following accuracy limits:

Linear Equation Accuracy Summary Table for Four Balances

Accuracy Indicators, from Linear Chart Information	Accura 4 Gram Scale	Calibrön 4 Gram Scale	Deering 10 Gram Scale	Ohaus 310 Scale (10 gram range)

% Slope error at </- 1 g	2.3%	0.7%	0.1%	0.1%
% y-intercept error at </- 1 g	0.2%	0.6%	0.7%	1.1%

% Slope error at > 1 g	2.1%	1.4%	0.5%	0.2%
% y-intercept error at > 1 g	0.3%	0.6%	0.2%	0.1%

% Slope error at Full Range	1.9%	0.8%	0.4%	0.0%
% y-intercept error at Full Range	0.2%	0.2%	0.1%	0.1%

Notes on "% Slope error": for the linear equation, y = mx + b, % Slope error = the absolute value of (1 minus m) times 100

Notes on "% y-intercept error": for the linear equation, y = mx + b, % y-intercept error = b divided by the maximum range of the scale times 100

Mass Range	Accuracy
</= 1.00 gram >1.00 gram	± 0.017 gram ± 0.7%

Download the complete detailed report for the Ohaus 310 Model

Methodology and Standard Weights for Accuracy Testing on Four Mechanical Balances

Features Comparison for Four Mechanical Scales, and Recommendations

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