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Service manual
4.3.7.2. Darkness counts
The program shows the current integration times for each filter. On running the test, the analyzer positions the
covered filter and measures the darkness counts with each of the integration times. Each time an optical reading
is taken, the analyzer subtracts these darkness counts from the count numbers measured to obtain the light
intensity. The program shows the values obtained and issues the corresponding alarms in case of anomaly. The
values should be around 4100 - 4300. All the count numbers shown by the tests given as follows have the darkness
counts subtracted.
4.3.7.3. Repeatability without moving the filter wheel
To perform this and the following tests, the base line and darkness count test must have first of all been performed.
This test takes absorbance readings during 1 minute with the filter wheel in fixed position. The technician can
choose the rotor well on which he wishes to take the readings and fill it with the liquid he desires. He can choose
which wavelength he wishes to use. The test can also be performed with the filter covered. When the readings end,
the screen graphically displays the count numbers obtained and the absorbances with regard to the corresponding
base lines. The program also shows the averages and/or standard deviations of the count numbers and the
absorbances.
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