SHB_U14 Chapter 3: Module components 3-19
IR module circuit board
Location in module
The circuit board is beside the analyzer module and is inserted in the Sensor-CPU
circuit board.
Structure
The back of the circuit board has three multipoint connectors for power supply and
signal connections.
There are two side-mounted terminal strips for two ribbon cable connections to the
optical components.
Function
The circuit board contains the following functions:
• 4-channel electronics for 4 possible infrared detectors with 0.3/ 1.0/3,5/12
amplification as controlled by the computer.
• 150 V power supply for the membrane capacitors.
• Power supply for beam 1 with computer-controlled beam power setting
• Power supply for beam 2 with computer-controlled beam power setting
• Power supply for chopper wheel motor
• Light barrier signal
• Power supply for calibration unit motors
Figure 3-21
IR module circuit
board
X3 X4
X9
X8
X7
/3,502'
Inputs/Outputs
X3 Infrared detector 1 preamplifier
Infrared detector 2 preamplifier
Modulator (beams 1 and 2, synchronous motor, split light barrier)
Calibration unit 1
Calibration unit 2
Pressure sensor
X4 Infrared detector 3 preamplifier
Infrared detector 4 preamplifier
X7 Connection to Sensor-CPU board
X8 Connection to Sensor-CPU board
X9 Connection to Sensor-CPU board
Continued on next page
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