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N5531S TRFL uncertainty

Question asked by bar28 on Jun 6, 2014
Latest reply on Jun 20, 2014 by tabbott
I'm trying to measure 0 to -130dBm absolute power level using N5531S (opt. 550 sensor) measuring reciver system and then calculate uncertainty for it. Agilent application notes has mentioned that
uncertainty can be calculate using the formula +/-(power meter range 2-4 + 0.005dB/10dB step), but some notes has mentioned about cumulative errors too which should take account? I'm little bit
confused now what formulas and uncertainty things i should take account for my uncertainty budget.