Active testing of three-phase devices 16A. With the CEE adapter AT16-DI you can quickly and efficiently test devices that are equipped with a 5-pin CEE plug 16A/6h. To do this, connect the adapter to a test device for testing portable devices in accordance with DIN VDE 0701-0702 or for testing in accordance with DIN VDE 0750/IEC 601, which only has a protective contact socket for connecting the test object and is able to measure the protective conductor current directly. The following tests can be carried out on devices with CEE plugs using the CEE adapter AT16-DI: Testing the continuity of the protective conductor system Insulation test Measuring the equivalent leakage current Measuring the differential current L1-L2-L3-N Carrying out the functional test.