A high voltage scanner is a device designed to automatically route high voltages to any number of test points in a given device under test. High voltage scanners are useful when conducting multi-point high voltage testing manually, as the operator is at risk of coming into contact with the high voltage due to extensive handling of the test leads and or probes. Use of a high voltage scanner drastically reduces the amount of operator interface with the high voltage.

Once the high voltage scanner test is initiated, the high voltage is automatically routed from point to point until the test is completed. A typical high voltage scanner can be configured in a variety of ways for a wide range of applications. The most common application used for a high voltage scanner is multiple point hipot testing. This application requires two channels for each test point. In this configuration, any given high voltage scanner test point can be connected to the high voltage output of the tester or to the return side of the tester depending on the routing of the high voltage scanner.