Figure 13-19: Pmt Preamp Block Diagram - Teledyne T200 Operation Manual

Principles of Operation
Note
Optical
Test
LED
High
Voltage
PMT
Power
Supply
To
X
Motherboard
PMT Temp
Sensor
(Thermistor)
TEC Control
PCA
PMT Temp Analog Signal
X
To Motherboard
PMT Output Signal (
X
to Motherboard
318
Teledyne API – T200 NO/NO2/NOx Analyzer Operation Manual
These adjustments should only be performed when encountering problems with
the software calibration that cannot be rectified otherwise. See Section 12.8.4 for
more information about this hardware calibration.
Optical Test
Generator
Electric
Test
Generator
MUX
PMT HVPS
D  A
Converter
Drive Voltage
PMT
Temperature
Feedback
Circuit
)
PMT DET

Figure 13-19: PMT Preamp Block Diagram

PMT Preamplifier PCA
Optical Test Control
from CPU
Electric Test Control
From CPU
HI Range Select
From CPU
PMT Output
Physical Range
Gain
Select Circuitry
Adjustment
Amp  Volts
Low Pass
Converter
Noise
and
Filter
Amplifier
HVPS Fine
Gain
Adjustment
(Rotary)
HVPS Coarse
Gain
Adjustment
(Rotary)
X
X
X
06858E DCN7057