BrandTech Scientific Transferpette S - Manual (Page 36)

*) = Calculation of accuracy (A%) and variation coefficient (CV%):
A% and CV% are calculated according to the formulas for
statistical control.
x
i
= Weighing results
n = Number of weighings
Z = Correction factor
(e.g., 1.0029 µl/mg
at 20 °C, 1013 hPa)
V
0
= Nominal volume
Checking the Volume
Testing instructions (SOPs) and a demo version of the EASYCAL TM 4.0
calibration software are available for download at www.brand.de.
Calculation (for nominal volume)
Accuracy* Coefficient of Variation*
Standard Deviation
Note:
V – V
0
V
0
A% = · 100
Σ (x
i
– x) 2
n – 1
s = Z ·
100 s
V
CV% =
Mean value x =
Σ x
i
n
Mean volume V = x · Z
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