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EEVblog #1176 - 2 Layer vs 4 Layer PCB EMC TESTED!

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julian1:

At 5.20min, for the test setup-up,
For someone who knows little about spectrum analyzers - what is the reason both attenuation (to prevent input saturation) and the pre-amplifier (to add gain) both turned on?
 

thm_w:

--- Quote from: julian1 on April 09, 2024, 11:29:09 am ---
At 5.20min, for the test setup-up,
For someone who knows little about spectrum analyzers - what is the reason both attenuation (to prevent input saturation) and the pre-amplifier (to add gain) both turned on?

--- End quote ---

As you said, attenuation is first which can prevent input saturation, or maybe damage to the instrument.

https://electronics.stackexchange.com/questions/345515/what-does-the-attenuation-setting-do-in-an-rf-spectrum-analyzer
https://saving.em.keysight.com/en/used/knowledge/guides/spectrum-analyzer-buying-guide/how-to-read-a-spectrum-analyzer-like-a-pro
https://www.keysight.com/blogs/en/tech/rfmw/2020/05/28/spectrum-analysis-basics-part-2-whats-in-a-spectrum-analyzer

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