23
PERFORMANCE CHECKS
Conduct performance checks in a room where the temperature does not change suddenly.
These checks are used to determine if the balance conforms to specifications, and should be
performed with the greatest care.
Preparation
※ Warm up the balance well.
※ Set the measurement condition as follows:
▶
▶
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Repeatability
(1) Load and unload 10 successive times, an weight which is near the capacity of the
balance. Then record the following items:
Xi : Displayed value when the weight is loaded after stability mark is lit.
Yi : Displayed value when the weight is unloaded after stability mark is lit.
(2) Calculate the standard deviation of x and
y using the formulas shown right.
Load : X1, X2, …, Xi, …, X10
↕
Unload : Y1, Y2, …, Yi, …, Y10
Where : , Average value
(3) Balance operation is normal when the standard deviation is less than 1.5 times the value
specified.
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