APPARATUS FOR DETECTING ELECTROMAGNETIC NOISE

PROBLEM TO BE SOLVED: To measure an electromagnetic field strength of a test signal by separating the test signal from a sample device noise even when an electromagnetic noise whose frequency is the same as that of the test signal simulating an external noise is present as the sample device noise.SOLUTION: A signal generator 1 generates test signals of a first frequency and a second frequency that are slightly shifted up and down from a frequency to be measured of an electromagnetic noise propagation path essentially supposed to be measured, and injects the test signals into a sample device 100 from an injection probe 3. A detection probe 4 receives an electromagnetic field generated by the sample device 100, and an electromagnetic field strength indicator 6 measures electromagnetic field strengths of the first frequency and the second frequency. A signal determination unit 11 interpolates the strength of the frequency to be measured with the strengths of the first frequency and the second frequency when a difference between the strengths of the first frequency and the second frequency is an acceptable value or less, and a data processing unit 14 generates electromagnetic noise distribution data on the basis of the interpolated value.