Appendices
107
A-6. Performance Checks
Not applicable to a verified balance as a legal measuring instrument in the EU
Repeatability
1
Allow the balance to warm up sufficiently by
turning ON the power and leaving it at the gram-
display at least two hours before starting the per-
formance checks.
2
Choose a weight that is near half the capacity
of the balance. Load and unload the weight five
successive times and record the following items:
Xi: Displayed value when the weight is loaded.
Yi: Displayed value when the weight is unloaded.
3
Use the formulas shown below to calculate the
values Rx and Ry.
4
Balance repeatability is considered normal
when both Rx and Ry are within five counts.
* One count corresponds to one minimum dis-
play unit of the balance model.
Notes
• Performance checks should be conducted in a room where there are no
sudden temperature changes. Refer to the installation guidelines for the
environmental factors that assure optimal performance.
• The following is a standard method used to determine whether the bal-
ance is working properly.
• The specific criterion should be set according to each user’s quality goal.
L
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L
oad
:
X
1
, X
2
, .....Xi, .....X
5
U
nl
oad
:
Y
1
, Y
2
, .....Yi, .....Y
5
Rx
=
X
(
m
ax)
−
X
(
min
)
R
y
=
Y
(
m
ax)
−
Y
(
min
)
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