Teledyne 6600 - Manual (Page 100)

1-10 Part III
Part III Model 6600
Teledyne Analytical Instruments
3.1.3 Detector 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 general-purpose units.
3.1.4 Control/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, +/-15 VDC), as well as the
phototube DC power supply to generate -250 VDC. Valve control signals
are interconnected to this board too.
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.