Patent ID: 7313492

Claim:
A device for increasing the dynamic range and measuring accuracy of a measuring device for spectrum analysis and/or network analysis of a high-frequency electronic signal within a frequency range comprising: a first mixer and first local oscillator adapted to perform a first frequency translation by imaging a high-frequency electronic signal of the measuring device successively into a resolution bandwidth of an intermediate filter of the measuring device, a detector that detects levels of the imaged spectrum signal; a display device for displaying the levels of the imaged spectrum signal; a first unit for controlling a second frequency translation; a second unit for identifying the frequencies of the spectral lines of interference signals that are generated in the measuring device; a third unit for superordinate procedural control for selecting a second frequency translation based on the identified frequencies of the spectral lines; a generator for producing a generator signal that is applied to a device under test, wherein the generator signal is produced by a second mixer having a second and third local oscillator as inputs to the second mixer; and a directional coupler for registering a feedback signal from the applied generator signal, wherein the feedback signal is the high-frequency electronic signal imaged by the first mixer.