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Is the data output of an ENA a power ratio or a voltage ratio?

Question asked by awgibson on May 2, 2017
Latest reply on May 4, 2017 by Dr_joel

We have always treated the S-parameter data output of our ENA as a power ratio (using "10 * log()") rather than a voltage ratio (using "20 * log()"). Where is it explicitly stated that the ENA's S-parameter output is a power ratio? All network analyzer training material specifies voltage ratio definitions for the S-parameters, and I do not see an explicit definition of this ratio in the equipment's user guide.