The salt spray machine generally uses the analog signal to complete the data transmission. The analog signal is the level conversion, filtering, amplification, sample and hold, and analog/digital conversion of the analog quantity sent by the sensor.
, input into the microprocessor. The complete analog signal input consists of a filter, an amplifier, a sample/hold, an analog-to-digital converter, and so on. Due to the number of points each system needs to sample and the required conversion
Accuracy and speed are different, so in a data acquisition system, there may be multiple conversion methods. There are usually five ways to signal the salt sprayer:
1. Single channel analog/digital conversion without sample/hold. This kind of circuit is suitable for occasions where the input signal changes slowly, and its conversion speed is general and the precision is high.
2. Single channel analog/digital conversion with sample/hold. This circuit has high conversion accuracy and high speed, and is suitable for high-precision digital conversion circuits.
3. Multi-channel analog to digital conversion. Each channel has its own sample/holder, as well as an amplifier, filter analog-to-digital conversion circuit.
4. Multi-channel shared analog-to-digital conversion. This kind of signal transmission mode is suitable for the conversion precision of a variety of signals, and the conversion speed requirements are basically the same. CPU usage is small, for each signal
Processing can be determined by software or by hardware, which is a more economical way of working.
5. Multi-channel shared sample/holder and analog to digital conversion. This mode of operation is suitable for analog-to-digital conversion of different ranges of the same signal, which is more economical and practical, and the CPU accesses each circuit.
Controlled by software, switched by multiplexer switch.
The salt spray machine adopts the above different working modes, depending on the test requirements, the higher the function, the more complicated the work mode, and the higher the price.
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