The difference between a broadband and a narrowband signal is a key distinction when measuring electromagnetic noise and testing for electromagnetic compatibility. During EMC testing, differentiating between narrowband and broadband disturbances is essential for pinpointing the source of noise so appropriate corrective action can be taken.
A narrowband electromagnetic disturbance “has a bandwidth less than or equal to that of a particular measuring apparatus, receiver or susceptible device,” according to the International Electrotechnical Commission.
A broadband disturbance, on the other hand, is “an electromagnetic disturbance which has a bandwidth greater than that of a particular measuring apparatus, receiver or susceptible device.”
Spectrum analyzers and EMI receivers are frequently used in testing labs to measure electromagnetic interference. Often, both narrowband and broadband noise will be present in the test results generated by these tools. In these cases, further signal analysis is required in order to make a determination.
The following diagnostic methods can be used to identify whether a signal is broadband or narrowband:
Tuning testing is another method for determining the difference between a narrowband and broadband signal, although it is generally only used in older commercial and military standards.
Having the right spectrum analyzer for EMC testing is essential in your ability to differentiate between broadband and narrowband signals. Let Com-Power Corporation match you with the best tool for the job. Contact our office to speak with an engineer today.