Measurement apparatus and method for measuring a signal having a plurality of component signals

The present invention relates to a measuring apparatus for measuring a first component signal and the at least one signal (101) having a second component signal. Frequency measuring device having a processing device (25), which is designed as a mixed signal (101) to form an intermediate frequency signal (103), and the IF signal is digitized to form a digital composite signal (104). Furthermore, the measuring device having a digital mixer (18), which is designed to generate a first composite digital test signal (107a) so that the digital composite signal (104) when the frequency shift and the second digital composite test signal (107b). Measuring apparatus further has a digital filter (19), a first digital filter is designed to test the digital composite signal (107a) to form a first filtered digital test signal (108a), and the second digital composite test signal (107b ) to form a second filtered digital test signal (108b).