2, the hardware configuration principle, TT302 input board,Apple PowerBook G4 15 Aluminum battery the main circuit board and display board composition. TT302 accept the signal from the thermocouple (TC), mV generator, thermal resistance (ohm) sensor, the input signal must be within prescribed limits. Voltage rating of the range of 50 ~ 500mV, the resistance of the specified range of 0 ~ 200W. The range can be configured.(1) input board, MUX multi-channel converter, its role is to ensure that the sensor terminal to the signal conditioning board to receive the voltage signal to the correct voltage between the terminals.
Power supply isolation and signal isolation is to prevent the input signal is Asus A32-F3 battery formed to ring current and the introduction of interference. Laptop battery from the main circuit board of the CPU control signals and the signals from the A / D converter through the the optocoupler transmission in order to achieve a signal isolation. Similarly, the panel power input must be isolated, power isolation DC converter for a high frequency AC, and use the power of the transformer separated contact.Between the CPU and the signal shaping communications controller, the introduction and delete the digital signal the start and end delimiter.
(2) the main circuit board, the central processing unit CPU is the core component of TT302, which controls Asus A32-F82 battery the coordination of the various components of the entire instrument, linearization, and communication. the data in RAM is lost. However, the CPU also has a non-volatile memory EEPROM, the laptop battery when the power switch off, where the data remains. Therefore, some important calibration, configuration and recognition applications are stored here. The main circuit board EEPROM memory used to store Asus a32-K52 battery configuration parameters (referring to the function module parameters).
Power supply isolation and signal isolation is to prevent the input signal is Asus A32-F3 battery formed to ring current and the introduction of interference. Laptop battery from the main circuit board of the CPU control signals and the signals from the A / D converter through the the optocoupler transmission in order to achieve a signal isolation. Similarly, the panel power input must be isolated, power isolation DC converter for a high frequency AC, and use the power of the transformer separated contact.Between the CPU and the signal shaping communications controller, the introduction and delete the digital signal the start and end delimiter.
(2) the main circuit board, the central processing unit CPU is the core component of TT302, which controls Asus A32-F82 battery the coordination of the various components of the entire instrument, linearization, and communication. the data in RAM is lost. However, the CPU also has a non-volatile memory EEPROM, the laptop battery when the power switch off, where the data remains. Therefore, some important calibration, configuration and recognition applications are stored here. The main circuit board EEPROM memory used to store Asus a32-K52 battery configuration parameters (referring to the function module parameters).
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