ANSI/ESD STM97.2-2016 requires reporting the highest readings from each test, together with summary statistics calculated from those readings. For both flooring samples and installed floors, the three highest readings from each test are retained. The summary it then reports is the minimum, maximum, and mean of the absolute values of those retained readings, in the same table as the readings themselves. The mean summarizes those selected readings; it does not replace them.
Reported values for flooring samples
For a flooring sample, section 5.2.3.12 requires reporting at least the nine highest voltages: the three highest voltages from each of the three tests, regardless of polarity. Under section 5.2.4, those nine voltages are reported and then summarized in the same table by the minimum, maximum, and mean of the absolute values obtained.
Reported values for installed floors
For an installed or applied floor material, section 5.3.1 requires recording the three highest readings for each test. Under section 5.3.2, the three highest readings from each of the five tests are reported as fifteen voltages. The same table then summarizes them by the minimum, maximum, and mean of the absolute values obtained.
Frequently Asked Questions
No. STM97.2-2016 requires the selected highest readings to be reported alongside the minimum, maximum and mean of their absolute values. The mean summarizes those selected readings; it is not a substitute for reporting them.
STM97.2-2016 section 5.2.3.12 requires at least the nine highest voltages: the three highest from each of three sample tests, regardless of polarity; section 5.2.4 then summarizes the absolute values by their minimum, maximum and mean in the same table.
STM97.2-2016 section 5.3.2 specifies fifteen voltages: the three highest readings from each of five tests. The same table reports the minimum, maximum and mean of their absolute values.