Part III | Model 6600 | |
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3.1.3Detector Module
The detector module contains the phototube detector, chopper assembly, and the first four stages of the electronics circuitry. The synchronized chopper motor rotates at 1800 rpm.
The filter wheel which carries the optical filters is marked with an “M” for measuring and an “R” for reference filter. A reference mark on the filter wheel must be aligned with a reference mark on the shaft in case the filter wheel is removed from its shaft. Another reference mark is inscribed on the switch plate and motor mount for the same reason. The detector printed circuit board holds the I to E Converter stage, second amplifier, logarithmic amplifier and inverter.
The magnetically activated reed switch is mounted on the motor mount. Oscilloscope test points are available and are mounted on a bracket inside the housing for explosion- proof models; test points are available on the outside in the bottom for
3.1.4Control/Analysis Unit
The control/analysis unit contains the majority of the electronics em- ployed by the analyzer as well as operator controls. There are four PCB assemblies. Three of them are located on the door: the Display PCB, The Main PCB, and the Amplifier PCB. The Interface PCB is located on the backplate assembly.
The Interface PCB: This large board is where the customer intercon- nects output signals, Alarm signals, unit receives its AC power, and holds the DC power supply for the electronics (+5,
The Amplifier PCB: This board receives the DC voltage signals of the Measurement and Reference coming from the detector amplifier. The differ- ence of these signals is amplified on this board. Any electronic zeroing action occurs on this board too. This board mounts on headers that are available only for that purpose on the Main PCB.
Teledyne Analytical Instruments