The wire and cable trace resistance tester (also known as the trace tester) is used to detect whether the insulation material of wires and cables will show traces or discharge under high voltage conditions. Electric trace testing is an important testing item to evaluate whether cables can operate safely and stably under long-term use or high voltage conditions. The inspection and testing of the electric trace tester involve the verification of the accuracy, reliability, and functionality of the instrument. The following are common inspection and testing methods for the anti scratch tester testing equipment:
1. Instrument inspection and preparation
Before conducting any testing, it is important to ensure that the testing equipment is in good working condition. Check whether the basic functions of the instrument are normal, especially the components related to testing.
Inspection items:
Power check: Ensure that the power supply of the testing instrument is normal, the voltage is stable, and the current meets the requirements of the instrument.
Instrument appearance inspection: Check whether the appearance of the instrument is intact, confirm that there are no damages, loose parts, or aging of cables.
Control panel inspection: Check whether the buttons and switches on the instrument control panel are flexible and responsive, whether the display screen is clear and the brightness is normal.
2. Testing environment requirements
The usage environment of the electric trace tester should meet the following conditions:
Temperature and humidity: The temperature of the testing environment usually needs to be within the specified range (such as 20-25 ° C), and the humidity should not be too high, otherwise it may affect the test results.
Grounding: Testing instruments and test benches should be properly grounded to prevent the risk of electric shock or testing errors.
There should be no strong electromagnetic interference sources in the testing environment to avoid affecting the accuracy of the test data.
3. Instrument function calibration and testing
Before testing, ensure that the instrument has undergone regular calibration and meets national or industry standards. Calibration usually requires a qualified laboratory to ensure that the test results of the instrument meet expectations.
Calibration project:
Voltage calibration: Ensure that the voltage output of the testing instrument is accurate and the error does not exceed the specified range. Usually, standard voltage sources are used for calibration.
Time setting calibration: Check whether the voltage application time of the testing instrument is accurate. Time delay or interruption during testing may cause deviation in the test results.
Current monitoring calibration: The testing instrument should be able to accurately monitor and record the current, ensuring accurate reading of the current.
4. Electric trace resistance test
The electric trace resistance test mainly simulates the electrical stress of cables during long-term operation by applying high voltage to check whether electric traces appear.
Test steps:
Sample preparation: Select the cable sample to be tested according to standard requirements and cut it to the specified length. Ensure that the surface of the sample is smooth and free of obvious defects.
Connect sample: Connect the cable sample to the two ports of the testing equipment, ensuring a secure connection and good contact.
Set test voltage: Set the applied test voltage based on the rated voltage of the cable. The test voltage is generally higher than the rated operating voltage of the cable.
Applying voltage: Gradually apply voltage and maintain it for a period of time, usually 30 seconds to a few minutes (specific time according to standard requirements).
Observing the situation of electric traces: During the testing process, it is necessary to observe whether there are electric traces, discharges, or other abnormal phenomena on the surface of the cable. According to the standard, if the cable shows electric traces within the specified time, it indicates that its resistance to electric traces does not meet the requirements.
Record results: After the test is completed, record the test voltage, time, and observed trace phenomena. If there are no traces, it indicates that the sample has passed the test.
5. Data recording and analysis
The test results should be recorded in detail and subjected to data analysis. Mainly includes:
Voltage stability: Whether the voltage is stable and whether there are fluctuations during the testing process.
Electric trace condition: whether electric traces have occurred, the location and form of electric traces, and whether they meet the standard requirements.
Insulation damage: Check the sample for electrical breakdown or insulation damage.
6. Performance testing of testing instruments
In addition to testing cables, periodic performance testing of testing instruments is also required to ensure their long-term stable operation.
Performance testing items:
Voltage fluctuation test: Test whether the instrument will experience voltage fluctuations when high voltage is applied, and the fluctuation amplitude should not exceed a certain range.
Overload protection test: Test whether the instrument can disconnect the power supply in a timely manner under overload conditions to avoid danger to equipment and personnel.
Error testing: Testing is conducted on samples with known standard values to verify the accuracy of instrument readings.
7. Regular maintenance and overhaul
Regularly inspect and maintain the scratch resistance tester to ensure it is in optimal working condition. Common maintenance tasks include:
Cleaning: Clean the surface of the testing instrument to remove dust and dirt.
Check cables and connection ports: Check for wear, breakage, or corrosion on cables and connection ports.
Update software: If the instrument has firmware or software system, it needs to be upgraded or repaired in a timely manner.
Regular calibration: It is recommended to conduct a comprehensive calibration once a year, especially for high-voltage measurement systems.
Conclusion:
The inspection and testing of the electric trace tester is a systematic process that requires ensuring the accuracy, stability, and suitability of the testing environment of the instrument. Regular maintenance, calibration, and performance testing are crucial for ensuring the safety and performance of wires and cables. If any abnormalities are found during use, they should be promptly repaired and adjusted to ensure the accuracy and safety of the test results.