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THEORY OF OPERATION
Model 300E Carbon Monoxide Analyzer
Instruction Manual
170
P/N 04288 Rev: A
Thermo-Electric
Cooler
Control Circuit
Sample
&
Hold
Circuits
(x4)
Amplifiers
Dark
Switch
Photo-
detector
Pre
Amp
Phase
Lock
Loop
E-Test
Generator
Compact
Programmable
Logic Device
M/R Sensor
Segment
Sensor
E Test Control
Dark Switch
Control
X10 Clock
Phase Lock
E Test A Gate
Dark Test Gate
X1 Reference
Segment
Status LED
Phase Lock Warning
M/R
Status LED
Segment Clock
E Test B Gate
Measure Gate
Measure Dark Gate
Reference Gate
Reference Dark Gate
CO Measure
CO Reference
56V
Bias
Variable
Gain Amp
From GFC
Wheel
From CPU
via Mother
Board
Signal
Conditioner
Signal
Conditioner
¸
10
x10
TEC Control
PHT DRIVE
Figure 10-11: 300E Sync / Demod Block Diagram
Signal Synchronization and Demodulation
The signal emitted by the IR Photo-Detector goes through several stages of
amplification before it can be accurately demodulated. The first is a pre-
amplification stage that raises the signal to levels readable by the rest of the
Synch/Demod Board circuitry. The second is a and a second variable amplification
stage that is adjusted at the factory to compensate for performance variations of
mirrors, detectors, and other components of the Optical Bench from instrument to
instrument.
Содержание 300E
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