The testing method for the stability of high-voltage power supply of photomultiplier tubes mainly focuses on the stability of the power supply and its impact on the performance of photomultiplier tubes.

1、 Test preparation

Equipment preparation: Ensure a clean and dust-free experimental environment, and prepare the necessary instruments and equipment, including photomultiplier tubes, high-voltage power supplies, light sources, data acquisition equipment, and software for real-time monitoring and recording of data.
Connection check: Confirm that the power supply and wiring of all devices are correctly connected to ensure safe operation of the instrument.

2、 High voltage power supply stability test

Initial setting: Set the output voltage of the high-voltage power supply to the lowest gear and connect the power connector on the photomultiplier tube.
Gradual boost: Gradually adjust the voltage of the high-voltage source until the photomultiplier tube starts working. During this process, it is necessary to closely monitor the output stability of the power supply and the response of the photomultiplier tube.
Stability monitoring: Under the stable output of the high-voltage power supply, use data acquisition equipment to monitor the output voltage of the power supply in real time and record the voltage change data over a period of time. In order to more accurately evaluate the stability of the power supply, a certain time interval (such as every 1 minute or 5 minutes) can be set for data collection.

3、 Data analysis and evaluation

Data processing: Import the collected voltage change data into the computer and use data processing software for analysis. Statistical indicators such as the average and standard deviation of voltage changes can be calculated to evaluate the stability performance of the power supply.
Stability calculation: According to the information in reference article 2, the stability of the power supply should be less than 5%. Stability can be evaluated by calculating the percentage of voltage change (i.e. the ratio of voltage change to initial voltage) to determine if it meets the requirements.
Result evaluation: Based on the results of data analysis, determine whether the stability of the high-voltage power supply meets the working requirements of the photomultiplier tube. If the stability does not meet the requirements, it is necessary to check the power supply equipment or adjust the power parameters to improve stability performance.

4、 Precautions

Safe operation: Throughout the entire testing process, it is necessary to strictly follow the safety operating procedures to ensure the safety of personnel and equipment.
Accurate recording: During the testing process, it is necessary to accurately record all relevant data and phenomena for subsequent analysis and evaluation.
Repeated testing: To ensure the accuracy of the test results, multiple repeated tests can be conducted, and the average of the multiple test results can be taken as the final result.

In summary, the testing methods for the stability of the high-voltage power supply of photomultiplier tubes mainly include testing preparation, high-voltage power supply stability testing, data analysis and evaluation, and precautions. Through strict testing and evaluation, it can be ensured that the stable performance of the high-voltage power supply meets the working requirements of the photomultiplier tube.