This is a measure of the noise power within a certain bandwidth.
Electrical noise meter.
Typically the specification is specified in dbm and within a 1 hz bandwidth i e.
Interestingly the thermal noise in a 50ω system at room temperature is 174 dbm hz.
Heat electric clicks or creaks as an electric baseboard heats up are normal.
Electrical noise is the result of more or less random electrical signals getting coupled into circuits where they are unwanted i e where they disrupt information carrying signals.
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In extreme cases these noise currents may even become great enough to.
Knowing the types of electrical noise and how to measure them are important first steps in enhancing your ability to troubleshoot electrical noise currents on data communication cables are a real problem.
Heating system noises involving electrical components may be traced to motors relays switches transformers and wiring.
Noise occurs on both power and signal circuits but generally speaking it becomes a problem when it gets on signal circuits.
Noise power density has the dimension of power frequency.
But hissing buzzing crackling snapping may be an electrical short and are dangerous.