On 5/12/2016 1:52 AM, Li Di wrote:
I need to measure the transient radiation emission from a big industrial system. There is a discharg between its two electrodes with high voltage difference. My client wants to measure the transient interference at their facility. I plan to use spectrum analyzer and antenna (or near field probe). But the scan time of some spectrum analyzers is long. It is not easy to catch the inteference. Could anyone give me some advice?
Prior to FFT-based receivers and spectrum analyzers, it was necessary to work around the occasional and unpredictable occurrence of transients using swept analyzers and receivers. The occasional transient was rather often dismissed as unimportant occurrence, even though it might pop up many decibels above whatever limits were applied.
Understanding that one could fail a later test due to these transients, I adopted the expedient of using a high-bandwidth oscilloscope and cascaded preamplifiers connected to whatever antenna or transducer was in use in the chamber. This was often useful in determining the source of the transient, which your application probably doesn't need. In any event, antenna and transducer factors are not easily applied with this setup.
More modern FFT-based instruments can compensate for antenna and transducer factors to deliver a fairly accurate representation of transient levels within the frequency range being processed at the time. If equipment under test is more often found to be failing to meet a standard? That may not be welcome news – but it can keep you out of trouble later.
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