- Radiated electromagnetic Interference
Interference that spreads in free air.
Protection is provided by shielding, but if no filter is used to prevent conducted emissions, unfiltered lines can serve as antennas for radiating interference outside the shielding cage.
- Insertion Loss
The insertion loss of a feedthrough suppression capacitor or filter connected to a given transmission system at a given frequency.
Defined as the ratio of the voltage across the lines that occurs immediately outside the insertion point before and after insertion, The ratio is expressed in decibels(dB) as follows:
Insertion loss=20 logE1/E2
In the formula:
E1=The ratio of the output voltage of the signal generator to the components in the circuit.
E2=output voltage of a signal generator with components not in the circuit.
When testing with a network/spectrum analyzer, the device typically maintains a constant output voltage and can be set up to record the output to input voltage ratio in decibels.
