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8.5
Integrated operational device checks
Self-test when switching on
Testing of the digital and analogue circuits of the device is automatically
performed by the device when it is switched on.
Please see chapter 8, point 8.2.
Differential measurements
All measurements are based on differential measurements. I. e. after selecting the
desired test, the device requests a zero measurement with a blank value cuvette.
This creates a reference base to the measured value so that minor deviations can
be compensated.
Measurement range controls
The measurement ranges of all measurement results shown in the display are
verified by an integrated measurement range control. If the measurement range
is exceeded, an error is displayed.
The measurement ranges that are separately defined for each parameter are
documented on the respective package inserts as well as in this operating manual,
chapter 9, Technical Data.
Plausibility controls
For multi-point measurements, the absorbance measured first forms the reference
basis. The programme verifies the plausibility of the individual measured values. If
specific requirements (e.g. E2 > E1 for ascending reactions) are not met, an error
message is displayed.
8.6 Notes on taking samples and carrying out measurements
Errors in taking samples will always lead to incorrect measurement results.
This chapter addresses the most common errors that can occur during taking
samples and measuring samples.
1.
Before measuring, cuvettes stored in a refrigerator must be brought to room
temperature. If the cuvettes are too cold, they will become misty with water
on the outer wall due to the humidity, which will lead to incorrect
measurement results.
2.
Never touch the lower part of the cuvette (where the liquid is) with bare
hands. If this should happen accidentally, clean the vials with a fluff-free cloth
before use. Cleaning with a fluff-free cloth is recommended in any case. Even
if the package is still new and unopened. Fingerprints on the cuvette lead to
incorrect measurement results.
3.
If the blood is taken from the heel using the microvette (neonatal bilirubin),
make sure that there is enough blood (approx. 60 µL) in the microvette, as 20
µL serum/plasma is needed for the measurement. Close the microvette well
after taking the blood sample and return it to the small sample tube for
centrifugation.