20
Thermo Scientifi c Novus SCP/MCP User Manual
Thermo Fisher Scientifi c
Inaccuracy (systematic error)
Inaccuracy is the difference between the dispensed volume and the selected
volume of a pipette.
A = - V
0
A
=
inaccuracy
= mean volume
V
0
= nominal volume
Inaccuracy can be expressed as a relative value:
A% = 100% x A / V
0
Imprecision (random error)
Imprecision refers to the repeatability of the pipettings. It is expressed as
standard deviation (s) or coeffi cient of variation (cv)
s
=
standards
deviation
= mean volume
n = number of measurements
Standard deviation can be expressed as a relative value (CV)
CV = 100% x S /
