How to Measure the Noise Floor of Your Signal Analyzer

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Learn how to use the channel power measurement along with appropriate front-end settings to determine your signal analyzer’s displayed average noise level (DANL).
  1. NI (now part of Emerson)
  2. noise floor
  3. DANL
  4. displayed average noise level
  5. pre-amp
  6. preamp
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Nice video, I have two questions:
1. Why the measure channel power is reduced as you lower the reference level? Let's say -10dbm reference, Is is because the noise floor is too close to the bottom(-110dBm) so that the result is inaccurate?
2. 4:15, when you remove the attenuation (from 10dB to 0), I expect the measured channel power will increase, but it actually drops 10dB, how is that happening?

Hubertastra
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So the noise floor is measured at -166dBm/Hz, and kTB = -174dBm/Hz. Does that mean the SA has a NF = 8dB?

weikiatteo
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@5.42min, It should be turn the PSD on.

avijitpradhan