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EMI Pre-Compliance Guide RIGOL Technologies
RIGOL Technologies CO., LTD. 09.09.2021
An additional strong tool is the combination of frequency view and power vs time (with
bandwidth up to 40 MHz
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) in parallel. For a SA it is only possible to view the frequency
spectrum or zero span with the max bandwidth of used RBW but not both in parallel. In
figure 9 the same DUT was tested with smaller frequency range and with normal spectrum
in combination of spectrogram. For this measurement it’s possible to speed up test time to
100 µsec. The interference pulses are now visible in spectrogram. With a Z marker it is
possible to measure the difference in frequency, amplitude and time of an interference signal.
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RSA5000: Standard BW is 25 MHz, 40 MHz is an option. RSA3000: Standard BW is 10 MHz, 25 MHz or 40 MHz is an
option
Figure 8: Real-time view (Density Spectrogram) of a power supply with interferences in low frequency range