Shimadzu TW223L, Инструкция по эксплуатации, Страница: 133 / 158

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133
Periodic Inspections
Periodic inspections are inspections that are performed periodically (for example once a year).
The content of periodic inspections must cover all aspects including performance and functions.
An overview is given below.
Overview of Periodic Inspection [Reference Example]
Frequency of
inspection
Once a year
Inspection
timing
Any day during the established month
Method of
inspection
Check for abnormalities in the following functions and external appearance.
Display panel
Menu operation keys / operation keys
Pan
Level
Check the following aspects of performance.
•
•
•
•
Repeatability:
•
Weigh a weight that corresponds to approximately half of the
weighing capacity of the balance five to ten times and assess the
dispersion in the weight readings obtained.
Eccentric
error:
•
Assess the difference in the weight readings obtained when a weight
corresponding to one fourth to one third of the weighing capacity of
the balance is placed in the center of the pan and at a position shifted
from the center by a specified distance.
Instrumental
error:
•
Decide on three to five observation points and assess the difference
between the values obtained when weights corresponding to these
points are weighed on the balance and the actual weight values of
the weights.
Criterion of
judgment
To be accurate to within ± 5 at one decimal place to the right of the digit where accuracy
is required when actually weighing with the balance.
For details on weights, see "About Weights" (
^
page 134 ) .
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