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OK, I am advancing in understanding of what happens there and it helps me to understand why I got results as I got..
Some more, please:
1. What IF/s frequency is/are used for spans of more than 200 KHz? Is it/them remain the same for spans up to 200 MHz?
2. What is the reason to select for spans below 200 KHz the better (lower) measured value between results with two different IF-s, why lower reading value is declared to be more truthful, what philosophy stands behind this approach?
One more question.
I did measurements with following setup (as you suggested): span 100 KHz, RBW 1 KHz, VBW 30 Hz, power, average, marker noise is at the center frequency, reducing result of marker noise by 3 dB.
Measurements were done at following center frequencies [MHz]:
10, 20, 30, 40, 50, 60, 70, 80, 90, 100
Please, provide a center frequency of the image (that noise energy at it is added) for all of them (10 values).
This will help me in interpretation of my results.
Thank you for details. I believe that knowing the right device setup for my measurement should help me, although measurement itself became more complicated.
It is very strange that the device, which are positioned and defined in its data sheet as a spectrum analyzer, can’t do well one of the typical tasks of spectrum analyzers, a measurement of noise.
I performed a measurement of noise with the SA44B setup as you described and with a correction of 3 dB for image energy.
I got values, which are by about 1 dB higher than values that I get with a span of 200 MHz and with no any correction.
1. Could you help me to understand this effect, please?
2. Which one of measurement results should I believe more?