Teledyne 2010A Operating Instructions Manual page 20

2 Operational Theory
removing the back panel. Figure 2-2 is a block diagram of the Analyzer
electronics.
Thermistor
Sensor
Heater
T emperature
Control
T emperature
Heater
Control
Keyboard
Displays
Power
Supply
Figure 2-2: Block Diagram of the Model 2010A Electronics
2-4 Part I
V ariable
Differential Gain
Amplifier Amplifier
Auto-
Range
Coarse
Adjustment
Fine
Adjustment
Selt-T est Signal to MUX
Processing
A to D Conv
Teledyne Analytical Instruments
A to D
Converter
M
U
X
Digitial to
Analog
Converter
(DAC)
Central
Processing
Unit
(CPU)
Model 2010A
T o CPU
0-1 V dc
Concentration
and Range
4-20 mA dc
Concentration
and Range
Alarm 1
Alarm 2
System
Failure
Alarm
RS-232
Range
Contacts (4)
External
V alve
Control
Rem ote Span
Control
Rem ote Zero
Control
Cal
Contact