In the previous articles, we have delved into the significance of electrical safety and explored the latest international standards in industries, such as EV and Medical. We hope you have enjoyed the valuable insights that enhance your understanding of electrical safety testing. Many of you have noticed that the Hipot test is a crucial part of these standards and have asked about how to connect your Device Under Test (DUT) to the safety tester during this test. In this issue, we will address this question by providing a brief introduction to the Hipot test and guiding you through the fundamental configuration. We'll also share some valuable tips to ensure more precise testing. In the end, you'll feel confident in conquering this challenge!
Understanding the Hipot Test
The Hipot test, also known as the Dielectric Withstand Test or High-Potential Test, is a common electrical safety test mandated by international standards. Its primary purpose is to verify the insulation integrity of the DUT by subjecting it to a high voltage beyond normal operating levels for a specified period. This test also detects any weaknesses or insulation failures in the equipment. Ultimately, during this test, the DUT should not experience breakdown.
Getting to Know Your DUT
Prior to delving into the Hipot test configuration, it is crucial to have a comprehensive understanding of your Device Under Test (DUT)'s specifications, particularly its rated voltage. The rated voltage serves as a direct determinant for the testing voltage. For example, most standards recommend using a test voltage calculated as 2 times the product's rated voltage plus 1000V.
Making DUT Connections to the Testers
To perform the Hipot test, follow these steps for connecting the DUT to the testing instrument using two test leads: the high-voltage lead and the return lead:
The above configuration is suitable for testing DUTs with an exposed metal chassis. If your chassis lacks any exposed metal, you can wrap the DUT's enclosure in foil and then connect the return lead to the foil. The diagram below shows how to connect the tester to the non-exposed metal chassis DUT.
For added convenience, you can use an adaptor box to simplify the test setup. The diagram below shows how to connect the adapter box to the SCI 290 Hipot tester and the DUT.
Additional Tips for Precise Testing:
In this issue, we discussed the most commonly required Hipot test configuration by electrical safety testing standard. this information has empowered you with the knowledge and confidence to successfully connect your DUT to the electrical safety tester. However, it's worth noting that certain standards demand more intricate Hipot testing setups. In the upcoming issue, we will guide you through the setup process and offer testing solutions for such scenarios. If you have any further questions or need assistance, please contact our sales representative. Happy testing!
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