1、 Daily maintenance

（1） Cleaning equipment

The casing and probe need to be cleaned regularly. Dust, oil stains, and other impurities may interfere with the normal operation of the instrument and even affect the accuracy of the detection results. It is recommended to use soft fabrics and specialized cleaning agents for cleaning, avoiding the use of corrosive chemicals. Special attention should be paid to the protection of the probe during cleaning to avoid damage to it.

（2） Check the power supply and connecting wires

The integrity of the power supply and connecting wires is crucial for the normal operation of the instrument. Regularly check the power cord for wear, aging, or damage to ensure a secure connection. At the same time, check whether the connecting wires between the probe and the instrument are loose or damaged. If there are any problems, they should be replaced in a timely manner to avoid signal transmission interruption or distortion.

（3） Storage conditions

It should be stored in a dry, ventilated, and non corrosive gas environment. Avoid prolonged exposure to high temperatures, high humidity, or direct sunlight to avoid affecting the performance and lifespan of the instrument. It is recommended to store the instrument in a dedicated protective box to avoid external impact.

2、 Calibration

（1） The Importance of Regular Calibration

Calibration is a crucial step in ensuring the accuracy and reliability of ultrasonic testing instruments. Due to environmental factors, mechanical vibrations, electronic component aging, and other factors that may affect the performance of the instrument during use, its performance may gradually deviate from the initial set value. Regular calibration can promptly detect and correct these deviations, ensuring the accuracy of the test results.

（2） Calibration cycle

The calibration cycle should be determined based on the frequency of use of the instrument and environmental conditions. Generally speaking, it is recommended to calibrate every 6 months to 1 year. For instruments with high frequency of use or harsh working environments, the calibration cycle should be appropriately shortened. In addition, if the instrument encounters abnormalities or inaccurate detection results during use, calibration should be carried out immediately.

（3） Calibration method

Calibration usually requires the use of standard calibration blocks and professional calibration equipment. The calibration process includes the following steps:

Check the zero drift of the instrument: Use a standard test block to check whether the zero point of the instrument is accurate, and adjust it in a timely manner if there is any deviation.

Calibrate the sensitivity of the probe: Using a known reflector on a standard test block, adjust the gain and sensitivity of the instrument to ensure that it can accurately detect the reflected signal.

Calibrate the depth resolution of the instrument: Adjust the focus and delay settings of the instrument through different depth reflectors on the standard test block to ensure the accuracy of depth measurement.

Record calibration results: After calibration is completed, detailed records of calibration parameters and results should be kept for future reference and traceability.

3、 The synergistic effect of maintenance and calibration

Maintenance and calibration are two important steps in ensuring the performance of ultrasonic testing instruments, and they complement each other. Good daily maintenance can extend the service life of instruments and reduce calibration frequency; Regular calibration can ensure that the instrument maintains accuracy and reliability throughout use. Therefore, users should establish a comprehensive maintenance and calibration system to ensure that the instrument is always in the best working condition.

4、 Summary

The maintenance and calibration of ultrasonic testing instruments are key to ensuring the accuracy and reliability of testing results. By regularly cleaning the instrument, checking the power supply and connection cables, and storing them properly, the service life of the instrument can be effectively extended. At the same time, regular calibration to promptly detect and correct instrument deviations can ensure the accuracy of test results. Users should attach great importance to maintenance and calibration work, establish a sound management system, and fully utilize the role of ultrasonic detectors to provide reliable guarantees for industrial production and quality control.