Shimadzu BL2200H, Instruction Manual

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11. 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:
•
•
•
Repeatability Load and unload 10 successive times,
(1) 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
σ
x and
σ
y using the formulas shown
right.
(3) Balance operation is normal when
the standard deviation is less than
1.5 times the value specified.