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Calculations (for the nominal volume)
∑ x
_
i
Mean value x
=
n
_
_
Mean volume V
= x
· Z
Z = correction factor
(e. g. 1.0029 µl/mg at 20 °C, 1013 hPa)
Accuracy
_
V
- V
0
A% =
· 100
V
0
Standard deviation
_
√
∑ (x
- x
)
2
1
s = Z ·
n - 1
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x
= results of weighings
i
n = number of weighings
V
= nominal volume
0
Coeffi cient of variation
100 s
_
CV% =
V
Berechnung (für Nennvolumen)
∑ x
_
Mittelwert x
=
n
Mittleres Volumen V
Z = Korrekturfaktor
(z. B. 1,0029 µl/mg bei 20 °C, 1013 hPa)
Richtigkeit
_
V
- V
0
R% =
· 100
V
0
Standardabweichung
√
∑ (x
1
s = Z ·
n - 1
– 29 –
x
= Wäge-Ergebnisse
i
i
n = Anzahl der Wägungen
_
_
= x
· Z
V
= Nennvolumen
0
Variationskoeffi zient
_
- x
)
2
100 s
_
VK% =
V
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