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What’s the difference between a primary test and a secondary test?

Kett AnswersCategory: FAQWhat’s the difference between a primary test and a secondary test?
1 Answers
Anonymous answered 6 years ago

A primary test is a test method that is not product specific… that means you can test ‘anything’ and get the right answer.  A secondary test is a test that is usually referenced to a primary test (or another secondary test method).  It has calibrations that are product specific.  An example of a primary test is a stop watch and tape measure (speed) and a secondary test is a speedometer.  The speedometer would need to be initially calibrated for the diameter of the tire.  In moisture analysis, the two primary methods are loss on drying and Karl Fischer tests.  All other test methods are considered secondary.