spectrum amplitude (dBV)

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Presentation transcript:

spectrum amplitude (dBV) Noise Crash Cart: Tektronix oscilloscope with FFT Protek 3290 RF Spectrum Analyzer 0.1-2900MHz Dell Laptop all can run on batteries isolation transformer AC current clamp (ground loop current detection) Ground tester Examples: RF spectra reveal several radio, TV, mobile frequencies but also a wide band emission from UPS @ 1-10 MHz in C-120 area AC ground loop currents in several system from the worst: 60 Hz+ harmonics (top) to a very good (bottom) 1 4 2 1 5 2 3 1 5 4 3 1 6 I (mA) spectrum amplitude (dBV) 3 2 2 3 4 6 5 4 5 time (ms) frequency (MHz)