Abstract: The present invention relates to a method and a device for measuring and displaying the frequency response of a test object (1), such as an amplifier, tape recorder, whereby a known test signal (S) is transferred to the input of the test object (1) while the transmitted signal (U) is measured at the output of the test object, whereafter the measured frequency is displayed on a display means (2). According to the invention, the test signal (S) is comprised of a sine pulse train of different partial signals (D1, D2, D3, D4) with predetermined frequencies and with the same amplitudes. The different partial signals are detected at the output of the test object (1) by a completely independent detector unit (3) which continuously, within a whole or half period of the signal, reads the amplitude as well as the frequency.