Principle and Troubleshooting Process of Electronic Scales

Working Principle of Electronic Scale

When weighing on an electronic scale, it also measures the weight of an object by utilizing the force of gravity acting on the object. Compared with mechanical scales, the difference is that the electronic scale is equipped with electronic devices. The electronic scale is equipped with a weight sensor, and the force of gravity on the object is transmitted to the electronic device through the sensor, which then converts the force of gravity into an analog signal of voltage or current. When an object is placed on the weighing pan, the sensor is compressed and deformed, causing a change in impedance. This change leads to a change in the voltage or current of the electronic device, which outputs an analog signal. The signal is amplified and converted into a digital signal, which is then output to the central processor for processing. The result is then displayed on the screen, allowing us to see the weight of the object.

Analysis Process of Electronic Scale Failures

Electronic weighing scales experience malfunctions for a reason. We must first analyze the most likely causes of these faults, similar to how a doctor diagnoses an illness. We need to examine, listen, ask questions, and feel to identify the root cause of the problem. Then we can determine the type of fault, diagnose the condition, and begin the appropriate treatment. Electronic weighing scales are composed of many components, and each component, each wire, or external conditions can potentially cause a fault. Overall, there are three types of faults to consider: mechanical, such as deformation due to temperature changes, improper leveling, or external interference; electronic, such as display issues due to temperature changes, abnormal deformation of sensors, loose connections, etc.; and external factors, such as wind, lightning, vibration during relocation, unstable power supply, etc.

When analyzing the faults of electronic weighing scales, it is important to start from the outside and then move inward. First, analyze external factors such as checking for fluctuations in the power supply, severe vibrations, strong winds, lightning strikes, etc. Considering these factors during the fault analysis process can greatly assist in quickly identifying the issue. A common method used to detect faults is to use a sensor simulator. By unplugging the signal line plug behind the weighing display instrument and connecting the simulator plug to power on the instrument, you can observe if the instrument is working properly. If it works normally, it indicates that the weighing display instrument is okay, and the fault lies in the scale body or wiring box, or signal line. If it does not work properly, it indicates a fault in the weighing display instrument or the power supply part at the front end. This method is very effective in determining the location of faults when the instrument cannot display normally. If the instrument can still display normally, but the electronic scale has a large weighing error, significantly deviating from the actual value, then a simulation check using a sensor simulator or using standard weights and a multimeter for judgment is necessary.

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