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noise figure measurements

Question asked by hezynawy on Jul 2, 2011
Latest reply on Aug 19, 2011 by tabbott
            as i sow in the specification of nfa n8975a  its could be possible to measure  nf  of a device that its noise figure greater than the ENR of the noise source. as i know the formula of  noise figure   is     NF(db) = ENR (db) -10log (y-1).     as i understand  the ENR OF THE NOISE SOURCE MUST BE GREATER THAN THE  NOISE FIGURE OF THE DEVICE. CAN  MODERATOR EXPLAIN ME THIS MATTER.