43
Repeatability
(1) Load and unload a weight
that is close to the
weighing capacity of the
balance 10 times. Load
the weight on the center
of the pan and record the
values described below.
Xi: Displayed value
when the weight is
loaded.
Yi: Displayed value
when the weight is
unloaded.
(2) Determine the standard
deviations,
σ
x and
σ
y
according to the
formula to the right.
(3) Balance operation is
normal if the values of
both
σ
x and
σ
y are less
than 1.5 times the
standard deviation
specified in Section
31.
“SPECIFICATIONS.”
Corner Load Error
(Off center error or Eccentric error)
(1) Prepare a sample that
weighs approximately 1/4
of the balance capacity and
shift it on the pan in the
order shown in the figure to
the right. Record the results
of 1 through 5 in this order.
(2) If the difference (corner load
error) between readings at
the center position and the
off center positions is less
than 5 counts, the balance
operation is normal.
