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the difference between digital sensors and analog sensors

Time: 2021-04-30

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the difference between digital sensors and analog sensors

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Digital sensor refers to the traditional analog sensor through the addition or modification of A/D conversion module, so that the output signal is digital (or digital code) sensor, mainly including: amplifier, A/D converter, microprocessor (CPU), memory, communication interface, temperature test circuit, etc., as microprocessors and sensors become cheaper and cheaper today, fully automatic or semi-automatic (high-level operations through manual instructions and automatic processing of low-level operations) systems can be Contains more intelligent functions, can obtain and process more different parameters from its environment.

The output signal of the analog sensor is an analog sensor, and its application is also very wide, whether it is in industry, agriculture, national defense construction, or in the fields of daily life, education and scientific research, analog sensors can be seen everywhere.


These two types of sensors appear frequently in the market. Let's take a look at the difference between digital sensors and analog sensors. There are probably the following seven points.

                        Digital sensor and analog sensor

(1) The signal of digital sensors is better than that of analog sensors. The maximum output signal of analog sensors is only about tens of millivolts, and the lowest is only a few millionths of millivolts. In the process of transmitting weak signals through the cable, it is easy to be interfered, resulting in unstable operation of the system or degraded measurement performance. The output signals of digital sensors are all around 3 to 4V, and the anti-interference ability is far greater than a million times that of analog signals.

(2) Digital sensors can better solve the problem of radio frequency interference than analog sensors. The low-voltage signals of analog sensors are extremely susceptible to electronic interference and other antenna electrical signals. The digital sensors have been designed with these anti-interference capabilities in mind. , They can be in high interference areas and guarantee metering performance.


(3) The digital sensor adopts 100% stainless steel welded shell. The SENST laser distance sensor is sealed, waterproof, moisture-proof, and corrosion-proof. It can work as usual in harsh working environments, and its measurement performance will not be affected. The protection level reaches IP68. Digital sensors can better solve the problems of moisture and corrosion resistance, while analog sensors cannot achieve moisture and corrosion resistance due to their material problems.


(4) The digital sensor has anti-lightning and large current discharge capabilities, which can solve the problems of anti-lightning and partial load or temperature influence. This is very important when installed and used outdoors. In addition, the digital load cell can automatically compensate and adjust the effects of unbalanced load and temperature changes.


(5) The digital sensor can solve the problem of realization effect-creep. When the load time is added to the sensor, its output often changes greatly. The digital sensor automatically compensates for the creep through the software in the internal microprocessor.

(6) The accuracy, reliability and stability of digital sensors are higher, which can reduce the errors often caused by analog sensors, because the corrected data is stored in each sensor in digital form, which can reduce analog signals. Accumulate errors. These errors are usually caused by factors such as connectors, wiring blocks (terminals), potentiometers, switches, and long cables during the transmission of analog signals.


(7) The digital sensor has a self-diagnosis function. SENST laser ranging sensor continuously detects internal working conditions. When a fault is detected, an error code will be issued, which greatly reduces the possibility of missed fault detection, which is also impossible for analog sensors.


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