BRAND HandyStep S Mode D'emploi page 44

6 Checking the Volume (Calibration)
h.
Repeat the same testing procedure at stroke setting 3 (6% of nominal
volume) and 1 (2% of nominal volume).
i.
This results in a total of the 30 required weighed values.
x
= Weighing results
i
Correction factor
Z =
(e.g. 1.0029 µl/mg at 20 °C, 1013 hPa)
Mean volume
Accuracy*
Coefficient of variation*
Standard deviation*
*) = Calculation for accuracy (A%) coefficient of variation (CV%):
A% and CV% are calculated using the formulas of statistical quality con-
trol.
Test instructions (SOPs) and a version of the calibration software
EASYCAL™ 4.0 are available for download at www.brand.de.
Operating manual
44
–
Mean
x
–
V
A% =
V
0
CV% =
s =
n
Number of weighings
=
∑
x
i
=
n
x – . z
=
–
–
V
V
0
V
0
Nominal volume
=
100 s
–
V
Z .
NOTICE
. 100
–
2
∑
x
( x – )
i
– 1
n
9974 63