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Teledyne API T703 Calibrator Operation Manual Theory of Operation
153
9.2. ELECTRONIC OPERATION
9.2.1. OVERVIEW
Photometer
Lamp Power
Supply
Photometer
Detector
Preamp
Absorption tube
Photometer
Detector
O
3
Generator
Analog Outputs
Aout 1
Aout 4
Analog Outputs
(D/A)
External Digital I/O
Power Up
Circuit
Sensor Inputs
PC 104
CPU Card
Disk on
Module
Flash
Chip
Aout 3
Aout 2
TEST
CHANNEL
OUTPUT
Status Outputs
1 - 8
Control Outputs
1 - 12
Control Inputs
1 - 12
O
3
Generator
Reference
Detector
I
2
C Bus
Keyboard
& Display
Photometer
Pump
Photometer
Lamp Heater
O
3
Generator
Lamp Heater
O
3
Generator
Lamp Supply
Thermistor Interface
Box
Temperature
Photometer Sample Gas
Pressure Sensor
O
3
Generator Input
Pressure Sensor
UV
Lamp
A/D
Converter
RELAY
PCA
Photometer
UV Lamp
Temperature
O3 Generator
UV Lamp
Temperature
Photometer Sample Gas
Temperature
(Optional)
COM2
Female
RS232
Male
ANALOG
IN
Ethernet
USB COM
port
Dis
p
la
y
(RS-232 only)
(RS-232 or RS-485)
USB
Touchscreen
(
I
2
C Bus
)
Figure 9-2: T703 Electronic Block Diagram
The core of the calibrator is a microcomputer (referred to as the CPU) that controls various internal processes,
interprets data, makes calculations, and reports results using specialized firmware developed by Teledyne API.
It communicates with the user as well as receives data from and issues commands to a variety of peripheral
devices via a separate printed circuit assembly called the motherboard.
The motherboard is directly mounted to the inside rear panel and collects data, performs signal conditioning
duties and routes incoming and outgoing signals between the CPU and the calibrator’s other major components.
07223B DCN6378