The calibration of DC hipot test equipment is a key step to ensure the accuracy and reliability of test results. The following is the detailed process and precautions for calibration:
1. Preparation before calibration
Check the device: Ensure that the device is in good condition without obvious damage or aging.
Environmental conditions: Calibration should be carried out in an environment with appropriate temperature and humidity, usually 23±5℃ and humidity ≤75%.
Standard equipment: Prepare a high-precision standard voltmeter, standard ammeter, or professional calibrator to ensure that its accuracy is higher than that of the equipment under test.
2. Calibrate items
The main calibration items of DC hipot test equipment include:
Output voltage calibration: Verify that the DC voltage output by the device is accurate.
Leakage current measurement calibration: Verify the accuracy of the current measurement function.
Time control calibration: Verify the accuracy of test time control.
3. Calibration procedure
(a) Output voltage calibration
Connect a standard voltmeter to the output of the device.
Set the output voltage of the device to different values (such as 1kV, 5kV, 10kV, etc.) and record the reading of the standard voltmeter.
Compare the device display value with the standard value, calculate the error, and ensure that the error is within the allowable range (usually ≤±1%).
(b) calibration of leakage current measurement
Connect a standard current source or high-precision ammeter at the output end of the device.
Set the fixed output voltage of the device, record the leakage current value displayed by the device and the standard value.
Compare the two to ensure that the error is within the allowable range (usually ≤±2%).
(c) calibration of Time control
Use a high-precision timer or calibrator to test the time control function of the equipment.
Set different test times (such as 1 minute and 5 minutes) and record the actual time and the displayed time on the device.
Compare the two to ensure that the error is within the allowable range (usually ≤±1 second).
4. Calibration records and reports
Record data: record the input value, output value, error, and other data in the calibration process in detail.
Generate reports: Generate calibration reports based on calibration results, including equipment information, calibration date, calibration results, error analysis, etc.
Identification status: Paste calibration identification on qualified equipment, indicating the validity period of calibration.
The calibration of DC hipot test equipment is an important link to ensure test accuracy and equipment reliability. Through the standardized calibration process and strict error control, it is possible to ensure the best performance of the equipment in the actual test, while meeting the requirements of the relevant standards and specifications.