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?
- 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.
- 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?