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10 QUESTION AND ANSWERS
10.1 DATA STORAGE
10.1.1 What is a sample
If a measuring instrument can remember results of tests, it is then possible to
compare the results today with those last week or last month. In this way gradual
changes in the quality of bonds or wires can be investigated. It is not easy to see
these changes in all the test results, due to the normal scattering of readings
around the average point.
To help remove this scattering effect it is usual to compare the average value of a
number of tests on the same part (a sample). A sample would usually be around
5 to 50 similar tests on a single product. Your machine may be configured to
require a fixed number of tests per sample, or may be flexible and allow any
number. In this case use the 'Save Sample' button to save the test results in this
sample.
Note: Once the sample is saved it is not possible to re-grade or erase any of the
tests within it.
10.1.2 What happens on the <New Sample> screen
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