4.5.9 Detection of the Input Signal
Figure 4-10 Graph of input signal detection
The system should detect the signal from filter position sensor, aspirate button,
cuvette temp. controlling fan blocking. Before detected by control module, all input
signals should go through the level translation circuit.
4.5.10 Analogue Board Control
Figure 4-11 Graph of analogue board controlling
Three signals are controlled by analogue board: digital potentiometer control signal
(DCPx), channel selection signal (CH), AD collection and control signal (AD_Ox and
AD_lx). All control signals are generated by control module. The signals between the
control module end and analogue board should go through level translation (TTL to
LVTTL).
4.6 Analogue Board
The analogue board realizes the functions of photoelectric signal, temperature
sensor signal modulation and amplification, AD collection.
The photodiode transforms the light signal which has passed through the flow
cell (or cuvette) into voltage signal. The voltage signal will be filtered,
amplified inversely, and finally output at the outputting end of the AD
converter through selectable switch.
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