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4
FUNCTIONAL DESCRIPTION
The CL551 portable temperature calibrator functional block diagram is shown below.
The instrument functional blocks are the following ones:
•
power supply
•
microcontroller (central unit + memory)
•
A/D converter
•
power driver
•
keyboard
•
switch test
•
digital interface
•
digital display
External Standard Sensor
Equalizing Block
Peltier cells
A/D COVERTER
Internal reference sensor
Modulated fan
Mains supply 110 or 220V
POWER SUPPLY
MICROCONTROLLER
POWER DRIVER
9
RS 232 INTERFACE
KEYBOARD
SWITCH TEST
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