Milkotester MASTER MINI User Information page 13

ULTRASONIC PORTABLE MILK ANALYZER
Making measurements
Make measurements with different samples (not less than 3) with known
values of a separate parameter (for example fat content), determined by
the known reference methods of analyses (for example Gerber's method
for determination of fat content). For more accuracy it is recommended
among these samples to be also such with values, close to the lowest
and highest bounds for the measured parameters.
Make 5-time measurement for each of the samples. Calculate the
average value for each sample parameter, without taking into
consideration the first measurement for each sample.
Analyzing the measurement results
Make comparison between the values of the parameter from the
reference sample and measured with the analyser. Make analyses of the
difference received.
If the received differences are relatively constant value for samples with
different content of the analysed parameter, it is necessary to make
correction.
For example
М% of the reference samples:
М% average when measuring
with the analyser:
Difference:
Conclusion: the difference is relatively constant value and correction is
possible to be done with – 0,2 %
If the differences are not a constant value it is necessary recalibration to
be done.
For example.
М% of the reference samples:
М% when measured with the
analyser:
Difference:
Conclusion: It is obvious that the difference is variable value and
recalibration have to be done.
w w w . m i l k o t e s t e r . c o m
2,20 3,00 3,80
2,38 3,17 4,01
0,18 0,17 0,21
2,20 3,00 3,80
2,02 2,93 3,76
-0,18 -0,07 -0,04
- 12 -
4,60 5,20
4,79 5,42
0,19 0,22
4,60 5,20
4,75 5,44
0,15 0,24