BRAND Transferpette S Digital Instrucciones De Manejo página 26

Calculation (for nominal volume)
x = Weighing results
i
n = Number of weighings
Mean value x =
Accuracy*
V – V
A% =
V
0
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.
Note:
Free testing instructions (SOPs) and a demo version of the
TM
EASYCAL 4.0 calibration software are available for download
at www.brand.de.
Σ x
i
n
0
· 100
Σ (x
2
– x )
i
n – 1
Checking the Volume
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
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