Wet leakage current testerIt is an instrument used to detect the leakage current value of electrical equipment in humid environments, and its calibration procedures should comply with relevant national regulations and standards. This regulation specifies the calibration methods, calibration items, calibration steps, and calibration cycles for testing instruments.

　　

The testing instrument calibration equipment should include the following parts:

　　

1. Standard leakage current source: used to provide standard leakage current values, with an accuracy of not less than 10% of the tested equipment.

　　

2. Voltage meter: used to measure the input voltage of the tested equipment, with an accuracy of not less than level 0.5.

　　

3. Standard resistance: used to measure the insulation resistance of the tested equipment, with an accuracy of not less than 0.1 level.

　　

4. Timer: used to measure the testing time of the tested equipment, with an accuracy of not less than 0.1 seconds.

　　

5. Environmental humidity control equipment: used to control the humidity of the testing environment and should be able to maintain a relative humidity within the range of 50 ± 5%.

　　

The calibration items of the wet leakage current tester should include the following:

　　

1. Basic error verification: With the cooperation of standard leakage current source, standard resistor, voltmeter, and timer, the error of the tested equipment should meet the technical requirements of the equipment.

　　

2. Repeatability verification: Under the same testing conditions, multiple measurements are taken on the same tested equipment to check whether its repeatability meets the technical requirements of the equipment.

　　

3. Insulation resistance measurement: Under the coordination of standard resistors, measure the insulation resistance value of the tested equipment, which should meet the technical requirements of the equipment.

　　

4. Testing time measurement: With the cooperation of a timer, the testing time of the tested equipment should meet the technical requirements of the equipment.

　　

5. Environmental adaptability testing: Check whether the performance of the tested equipment meets the technical requirements of the equipment in high temperature, low temperature, high humidity, low humidity and other environments.

　　

The calibration steps of the tester should include the following:

　　

1. Power on inspection: Check whether the appearance of the inspected equipment is intact and whether all components are working properly.

　　

2. Basic error verification: Connect the standard leakage current source, standard resistor, voltmeter, and timer to the tested equipment for basic error verification.

　　

3. Repeatability verification: Under the same testing conditions, multiple measurements are taken on the same device under test, and the test data is recorded to calculate repeatability.

　　

4. Insulation resistance measurement: Connect the standard resistor to the tested equipment to measure the insulation resistance.

　　

5. Test time measurement: Connect the timer to the device being tested to measure the test time.

　　

6. Environmental adaptability testing: Place the tested equipment in different environments to check whether its performance meets the technical requirements of the equipment.

　　

7. Data processing and analysis: Processing and analyzing test data to evaluate the performance of the tested equipment.

　　

The calibration cycle of the wet leakage current tester should be determined according to the frequency of use and environmental conditions, generally not exceeding one year. If any equipment abnormalities or performance degradation are found during use, timely calibration should be carried out.