When a product is designed to operate from a DC power source, what type of hipot testing is used?

The use of DC hipot testing for products designed to operate from a DC power source is essential for assessing insulation integrity. In this type of testing, a direct current voltage is applied to the insulation components of the device, which allows the tester to determine whether the insulation can withstand the specified voltage without breaking down.

Using DC is particularly relevant because the product is intended to run off a DC supply, so the testing conditions closely match the operational environment. This provides a more accurate assessment of the insulation's performance in real-world conditions, helping to ensure safety and reliability.

In contrast, AC testing might not accurately reflect the stresses the insulation will experience in actual use with a DC source. Although both AC and DC testing modalities have their merits, for items specifically designed for DC operation, focusing on DC testing is the most appropriate method.