Campbell-scientific CS125 Present Weather Sensor Manual de usuario Pagina 51

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A-1
Appendix A. CS125 block diagram
850nm
Emitter
Photo-
detector
Transimpedance
amplifier
Power level +
Driver circuitry
Emitter power
feedback
Dirty window
detector
Dirty window
detector
Amplifier
and filter
Amplifier
and filter
Second stage
amplifiers and filters
14-bit Analogue to
digital converter
MCU
(Micro controller unit)
Hood heater
drive
Low noise PSU
Two 5V user
alarm outputs
RS232 or RS485
serial
communications
24V
AC/DC
12V DC
Hood
temperature
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