Ⅰ. In terms of measuring equipment 

1. Select high-precision instruments 

To choose impact galvanometers or other measuring instruments with high sensitivity and low zero point drift. For example, choosing a digital impact galvanometer with advanced electronic technology and stable performance can improve measurement accuracy and stability. 

Calibrate the instrument regularly to ensure that its measurement accuracy is always at a high level. The instrument can be calibrated using standard samples or known magnetic field sources according to calibration methods and cycles provided by the instrument manufacturer. 

2. Optimize magnetic field sources 

To use high-stability magnetic field sources, such as high-performance electromagnets or permanent magnet systems. Ensure that the magnetic field source can provide a uniform and stable magnetic field and that the magnetic field strength can be accurately controlled. 

Perform temperature compensation and stability monitoring of the magnetic field source. Install temperature sensors and control devices to reduce the impact of temperature changes on the output of magnetic field source; at the same time, use magnetic field monitoring equipment to monitor the stability of the magnetic field in real time for timely adjustment and correction. 

Ⅱ. Sample treatment 

1. Standardize the sample preparation 

To adopt accurate cutting and grinding processes to minimize the stress introduced during sample preparation. Professional cutting equipment and grinding tools can be used, and processing parameters such as cutting speed, grinding pressure, etc. can be controlled to ensure the size and shape accuracy of the sample. 

Annealing the sample to eliminate internal stress and improve material uniformity. According to the characteristics of the amorphous nanocrystalline material, the appropriate annealing temperature, time and atmosphere are selected to optimize the magnetic properties of the material and reduce measurement errors. 

2. Ensure sample purity and uniformity

During the material preparation process, strictly control the purity of raw materials to avoid the introduction of impurities. High-purity raw materials and advanced preparation processes, such as vacuum smelting, rapid solidification and other technologies, can be used to improve the purity of the material. 

Perform uniformity detection of the samples, such as using metallographic microscopy, X-ray diffraction and other technologies to analyze the microstructure and component distribution of materials. If unevenness is found in the sample, it can be improved by further processing or optimized preparation process.

Ⅲ. Environmental control aspect 

1. Stable temperature environment 

During the measurement process, the temperature of the measuring environment is controlled within a constant range. You can use a constant temperature box or a temperature control system to ensure that the temperature fluctuation is less than a certain range (such as ±0.5℃). 

The sample is preheated to the measured temperature and remains stable. Before measurement, place the sample in a constant temperature environment for a period of time to balance its temperature with the ambient temperature to reduce the impact of temperature changes on the measurement results. 

2. Shield external magnetic field interference

Magnetic shielding devices are provided around the measurement area, such as shielding covers or shielding chambers made of highly magnetically permeable materials. These shielding devices can effectively reduce the interference of external magnetic fields on measurements and improve the accuracy of measurements. 

Stay away from strong magnetic field sources and electrical equipment. When performing measurements, place the measuring equipment and samples away from strong magnetic field sources (such as large electromagnets, motors, etc.) and electrical equipment to reduce the impact of the external magnetic field. 

Ⅳ. Operating specifications 

1. Accurately control the measurement time 

Use high-precision time measurement equipment, such as digital timers or oscilloscopes, to accurately control the measurement time. Ensure that measurements can be started in time at the moment of change in the magnetic field and read measurement data at the appropriate time point. 

The measurement process is repeated several times and the average value is taken to reduce the impact of time error. Through multiple measurements, fluctuations in measurement results due to inaccurate time control can be reduced. 

2. Improve operator skills 

Provide professional training to operators so that they are familiar with the principles, operating methods and precautions of impact measurement. Operators should understand the performance and usage skills of the measuring instrument, be able to correctly set the instrument parameters, connect the lines and perform measurement operations. 

Establish strict operating specifications and quality control systems. Develop detailed operating procedures and quality standards, require operators to operate in accordance with the specifications, and review and verify the measurement results to ensure the accuracy and reliability of the measurement data.