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Noise power measurements on PSA series spectrum analyzers

Question asked by nsm on May 20, 2019
Latest reply on May 22, 2019 by ScottLP

Hi,

 

We are using PSA series spectrum analyzers in our MMIC validation setup. I had the following question on the use of a noise marker.

 

I would like to measure the noise density(dBm/Hz). Would there be a difference in the measurement two measurement scenarios listed below? 

 

  1. I turn on the normal marker with an average setting of say 50 and then do a single run. Once the averaging is done, I turn on the noise marker. Then note the noise marker reading.
  2. I turn on the noise marker with an average setting of say 50 and then do a single run. The note down the noise marker reading.

 

In my opinion, the results should be the same as the noise marker does only a math function based on the RBW setting. But I noticed that there is a difference between the two. There is a difference of about 2dB or more. Which is the correct way to do the measurement? Will this also change with the detector that is being used?

 

best Regards

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