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It is important that a calibration tile has an up-to-date certificate and the normal renewal period is 12 months.
However, it should be noted that if successive calibration certificates give the same value for the tile,
extension of the renewal period to 24 months is permitted.
10.2 MAINTAINING YOUR GAUGE
Before use, check that the metal base of your gauge is clean and free of any damage. The optical cavities
and lenses must also be free of dust or any other contamination.
When the battery voltage falls below the required level to operate the gauge, the display will briefly show a
warning message and then switch itself off. Fit new batteries.
11 STATISTICS TERMINOLOGY
For this purpose the individual readings are defined as values x
set.
•
Statistical sample population, n: The current number of stored readings (STORE), on which the
statistical calculations are based.
•
Maximum (MAX): The highest reading in the data set.
•
Minimum (MIN): The lowest reading in the data set.
•
Mean (MEAN): The average value for the data set. The sum of all the individual readings divided by
the total number of readings.
•
Standard Deviation (SD): Square root of the sum of squared deviations from the mean.
•
Coefficient of variation (CV): Standard deviation divided by the mean; a measure of the data scatter
that can be compared for different mean values.
, x
, --- x
and x
is any reading in the data
1
2
n
i
R
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