H31-341_V2.5 · Question #807
The unit of insertion loss is dBm.
The correct answer is B. False. B is correct because insertion loss is measured in dB (decibels), not dBm. Insertion loss expresses a ratio - how much signal power is lost when a component is inserted into a circuit - and ratios are unitless quantities expressed in dB. Why A is wrong: dBm is an absolute power…
Question
The unit of insertion loss is dBm.
Options
- ATrue
- BFalse
How the community answered
(28 responses)- A21% (6)
- B79% (22)
Explanation
B is correct because insertion loss is measured in dB (decibels), not dBm. Insertion loss expresses a ratio - how much signal power is lost when a component is inserted into a circuit - and ratios are unitless quantities expressed in dB.
Why A is wrong: dBm is an absolute power unit referenced to 1 milliwatt (0 dBm = 1 mW). It describes an actual power level at a single point, not a comparison between two power levels.
Memory tip: Think of the "m" in dBm as standing for "milliwatt" - a concrete reference point. Whenever you're comparing two values (like power in vs. power out), you drop the "m" and use plain dB. Insertion loss is always a comparison, so it's always dB.
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