Rainin AutoRep S Bedienungsanleitung Seite 14

Checking the Volume
Calculation (for nominal volume)
x = Weighing results
i
n = Number of weighings
Mean value x =
Accuracy*
V – V
A% =
V
V = Nominal volume
0
Standard Deviation
s = Z ·
) = Calculation of accuracy (A%) and variation coefficient (CV%):
*
A% and CV% are calculated according to the formulas for
statistical control.
14
Σ x
i
n
· 100
0
0
Σ (x
– x )
2
i
n – 1
Z = Correction factor
(e.g., 1.0029 µL/mg
at 20°C, 1013 hPa)
Mean volume V = x · Z
Coefficient of Variation*
100 s
CV% =
V