Test device for the detection of a weakness in contact of an electrically conductive connection (5) implemented with a plurality of electrically conductive system elements (6, 7, 8) for transmitting signals or energy, with a measuring chamber (2) within which the system elements (6, 7, 8 ) of the connection (5), which are connected in an electrically conductive manner, and an energy-supplied heat radiator (9, 9R), whose transferred heat rays (91, 91R), which are radiated into the measuring chamber (2), on the area of the system elements (6, 7, 8) are directed and a heat field (12, 12R) of the insulated and the metal parts of the system will implement those connected system elements (6, 7, 8), as well as a thermal imaging unit (11, 11R) with which a optical capture of the converted heat field (12, 12R), which the heated, insulated and metal system parts of those connected system elements (6, 7, 8) will radiate, and a signal-like conversion to one m thermal image of the connected system elements (6, 7, 8), is implemented sensitively, and a thermal image reproduction unit (13, 13R), with which a visual reproduction of the converted thermal image is implemented, in which the thermal image detection unit (11, 11R) and the thermal image reproduction unit (13, 13R) are connected in terms of information technology, characterized in that the thermal image detection unit (11, 11R) with a flat plate (22), an optical device (23) which is designed with a lens, and an electronic unit (24) is implemented, the plate (22), which is used as a focal plane for the optical device (23), a heat sensor system (26) which is distributed over the surface of the plate (22) and several Heat sensors (27) is formed, and wherein a temperature-stabilizing surface element (25) is attached flat to the plate (22) below the focal plane, such that a plate surface is spaced (a) the optical device (23) directed towards the measuring chamber (2) is arranged such that there are transferred heat steels (91) of the heat field (12), which are guided and distributed by the optical device (23) for the area-sensitive recording, and wherein the heat sensors (27) of the plate (22) are connected to the electronics unit (24), which supplies the thermal image supply unit (13, 13R) with information technology after the signal-shaped conversion of the sensitively detected heat rays (91) has taken place.
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