Appendix LB 9507
10
A.4 Background measurement
Background measurement is performed with instruments with one
or two injectors installed. This measurement is used for detection
the luminescence and phosphorescence background of the
instrument, the sample tube and the sample.
Performing a background measurement
The user can define when creating protocols whether a
background measurement is to be performed.
R10
06: MEASURE BACKGROUND NO
YES NO LAST DISPLAY
Select here whether the background rate is to be measured prior
to the injections and the actual measurement of each tube.
If you select <
NO>, display R14 will follow.
<
YES> takes you to the next display:
In the next step the measuring time is specified.
R11
06: MEASURING TIME BKG [s] 0.5
(0.1 - 200.0) LAST DISPLAY
Enter between 0.1 and 200.0 seconds for the background
measurement and press <
enter>. Reasonable times start at half
a second, allowing statistical variations to be compensated for.
Otherwise, the background values may be too high or too low
which either distorts the result of the measurement or leads to an
exceeding of the threshold.
Remember that the background effect is measured in order to
obtain an alarm threshold for background rates that are too high,
as with phosphorescence effects for example.
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