Brandtech-scientific Macro Transferpettor Manuale Utente Scaricare il pdf (Pagina 20)

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Berechnung von Richtigkeit (R%)

und Variationskoeffizient (VK%):

R und VK werden nach den Formeln der

statistischen Qualitätskontrolle berechnet.

Calculation of accuracy (A%)

and coefficient of variation (CV%):

A and CV are calculated according to the

equations used in statistical quality control.

Berechnung (für Nennvolumen)

Variationskoeffizient

VK % =

Standardabweichung

s = Z ·

Σ (x

– x)

n – 1

Richtigkeit

R % = · 100 V

= Nennvolumen

V – V

Mittleres Volumen V = x · Z

Z = Korrekturfaktor

(z. B. 1,0029 µl/mg bei 20 ºC, 1013 hPa)

Mittelwert x =

Σ x

= Wäge-Ergebnisse

n = Anzahl der Wägungen

100 s

Calculations (for the nominal volume)

Coefficient of variation

CV % =

Standard deviation

s = Z ·

Σ (x

– x)

n – 1

Accuracy

A % = · 100 V

= nominal volume

V – V

Mean volume V = x · Z

Z = correction factor

(e.g. 1.0029 µl/mg at 20 ºC, 1013 hPa)

= results of the weighings

n = number of weighings

Mean value x =

Σ x

100 s

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Brandtech-scientific Macro Transferpettor Manuale Utente Pagina 20

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