Questions about instruments andmeasurement procedures

Do you have questions about a specific type of instrument or measurement? Ask your local distributor.

What measurement do we need?
A LISN is a Line Impedance Stabilisation Network. It outputs the noise signals from the DUT over a 50 Ohm load, to be measured by a spectrum analyzer.

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Is filtering needed?
Filtering of the LISN’s output is important is the DUT produces high interference outside the band of interrest. For signals below 150kHz, the standard does not provide a limit. If high net-harminic currents exist (multiples of 50Hz) these may saturate the input …

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Is limiting needed?
Absolutely. When the mains voltage is switch on, a transient of 310Vp (when using 230Vac) may occur at the input of the spectrum analyzer.

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Do I need to measure the Mains power of my device?
The CE requirements for powersupplies >75W stipulates the limits for net harmonics. These are the frequency components of multiples of 50 (or 60)Hz, upto the 40th harmonic.
A power analyzer like the DPA3011 performs these measurements, including inrush current …

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