High current source for a test system for testing an electrical power devce, and test system

A test system for testing an electrical energy apparatus with a test current, comprising:

• a portable main device with a housing that has a module slot for accommodating and connecting to an expansion module, and a connection arrangement arranged on the housing for connecting to a portable additional device;
• and
• a high-current source as the expansion module;
• wherein the high-current source further has a housing for the module slot and, arranged on the housing an energy supply connection arrangement an input connection arrangement and a first and a second high-current connection
• wherein the portable main device further has:
• a measuring apparatus for measuring measured variables, and
• a control apparatus for controlling the measuring apparatus and the high-current source for testing the electrical energy apparatus
• wherein the portable main device is configured to control the high-current source
• when it is accommodated in the module slot via the input connection arrangement and to supply said high-current source with energy via the energy supply connection arrangement and
• wherein the high-current source is configured, controlled by the control apparatus to generate an output signal between the first and the second high-current connection and therefore to provide the test current.