Testing device comprises a signal producing unit emitting an electrical signal having a predetermined frequency spectrum and electrically coupled to a sample, and an outlet via which the signal is output with the sample

摘要

Testing device comprises a signal producing unit (12) emitting an electrical signal having a predetermined frequency spectrum and electrically coupled to a sample (18); and an outlet (23) via which the signal emitted by the signal producing unit is output with the sample. An independent claim is also included for a process for producing a test signal using the testing device. Preferred Features: The signal emitted by the signal producing unit comprises a broadband noise signal, preferably in the region of 0.5-100 MHz. A pulse generator (14) is provided so that the signal emitted is pulsed. The pulse frequency of the generator corresponds to a biologically neutral frequency, preferably in the region of 1900-2050, especially 2000 Hz.