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How the Noise Figure of Pre Amp affect the accuracy measurement?

Question asked by stanleysg on Jun 23, 2013
Latest reply on Jun 26, 2013 by tabbott
hi all,

if i would like to input a weak signal into our SA and without the internal pre amp option, i am substituting an external pre amp with gain like 30dB, NF 6dB.

from Agilent application note, the pre amp will lower down the DANL of the instrument, but may i know will this noise figure spec affecting the accuracy of the reading?

example, -60dbm input power reading become worse after adding the pre amp?

thanks you for the confirmation.