2025-11-28
Analysis of Reasons for Zero Return and Non Zero Return of Weighing Instruments and Determination of Measurement Standards
In the fields of industrial production, commercial trade, and scientific research, weighing instruments play an increasingly important role, and their zero return status directly relates to the accuracy and reliability of the weighing results. Analyzing the causes of successful and failed zero return, and judging the instrument's status based on national standards, is essential for ensuring the normal operation of weighing work.
Normal zero return means that the weighing instrument can accurately return to zero when unloaded. This indicates that the instrument's various functions are normal and its metrological performance meets the requirements. The main reasons for normal zero return include the following aspects:
First, the weighing instrument's zero return function is normal. During factory and periodic calibration, technicians record the instrument's current zero position and store it in memory. When the instrument is subsequently unloaded, the control system calls the zero data from the previous calibration, causing the display to show zero.
The sensor performance is stable. As the core component of the weighing instrument, the sensor is responsible for converting the weight signal of an object into an electrical signal and transmitting it to the instrument. If the sensor has good linearity and its sensitivity does not drift, it can output a stable signal when unloaded.
The instrument's circuits are normal. The internal amplification circuit, filtering circuit, and A/D conversion circuit of the instrument are working correctly, accurately processing the electrical signal transmitted from the sensor. This avoids circuit faults that could cause incorrect zero recognition and display.
From the perspective of external use, stable environmental conditions also provide a guarantee for the zero return of the instrument. Appropriate temperature, humidity, and the absence of strong vibration or electromagnetic interference can effectively prevent fluctuations in internal components and ensure the sensor is not affected by external factors producing abnormal signals, guaranteeing a stable zero return when the instrument is unloaded.
A normal zero return indicates that the weighing instrument is in a good initial state, which lays the foundation for subsequent accurate weighing. During the weighing process, the instrument uses zero as the baseline, accurately measuring the weight of the object being weighed, reducing weighing errors caused by initial zero point deviation, and ensuring the accuracy of the weighing data.
In actual use, weighing instruments often fail to return to zero. This not only affects the accuracy of the weighing data but may also lead to production, trade, and other operational losses. The main causes of zero return failure can be generally categorized into three areas: the instrument itself, environmental influences, and improper operation.
If the instrument has not been calibrated for a long time, or if the operation during calibration is improper, the calibration weights are inaccurate, or the calibration steps are incomplete, it will cause loss of the instrument's zero point data. As a result, when the instrument is unloaded, it cannot recognize the zero point, leading to a failure to return to zero. Additionally, a failure of the instrument's internal storage chip may also lead to zero point data loss, which prevents the instrument from functioning normally.
