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peret FLUO - Measurement Warnings and Status; Underflow and Overflow Measurements; Open Aperture Display; Measurement Time Too Short

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FLUO Manual v2.02 GB.docx
12 / 13
6/29/2018
PERET GmbH/S.r.L www.peret.it info@peret.it
Click the right button on your device to toggle between near and far
intensity.
Underflow and Overflow measurements
The FLUO does automatically check the plausibility of measurement results
and displays proper warnings in case of invalid measurement:
Underflow
An underflow happens, if the measurement resolution is to low, such as
between 100% fluorescence and 0% fluorescence there are less than 50 ADC
digits (2% per digit). In this case the FLUO displays uF in the proper
measurement channel.
Overflow
The FLUO has a large dynamic range with auto Gain setting such as an
overflow happens quite rarely. The overflow is reached whenever the signal
obtained in one channel is higher than the top level of the ADC. The overflow
for the proper channel is then displayed as oF.
Open aperture
For safety reasons the UV LED will not switch on if the device is not
positioned onto a substrate. In this case the Display will show ‘ooo’.
Measurement time to short
Keep the FLUO in front position until the measurement number appears in the
LCD. If you move the FLUO back to its parking position to early, the ‘---‘ in the
LCD tells you, that measurement time was too short.