HP 8572A User Manual

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Purp ose This test measures reference level switching uncertainty.Note You must complete this test b efore you p erform any amplitudeaccuracy test.Description \Reference Level Switching Uncertainty" relies on theattenuator accuracy of the HP 3335A synthesizer/level generator.Although Reference Level Switching Uncertainty is not directlysp eci ed for the HP 8572A microwave EMI receiver, it is one of thecontributors to absolute amplitude accuracy.The unit under test is set for a reference level of +13 dBm, and aresolution bandwidth or QPA (CISPR) bandwidth to b e tested.The level-generator amplitude is adjusted to set the signal 2 dBb elow reference level. The di erence b etween the level generator andmarker amplitudes establishes a reference error at this p oint.The level generator and EMI receiver system reference level arestepp ed down in 4 dB increments until the signal is 57 dBm or10 dB ab ove the displayed average noise, which ever is higher.The amplitude di erence b etween the level generator and thedisplayed trace average is measured at each level generator step.The di erence b etween the amplitude error at each level generatorstep and the reference error is the level switching uncertainty of theEMI receiver system .Test SettingsFunction SettingsRF FREQ 30 MHzRFPS (atten) 43 dBEMI receiver system (input) receiver INPUT 1SA (atten) 10 dBQPA lter 200 Hz, 9 kHz, 120 kHzRES BW 3 kHz, 10 kHz, 100 kHz, 1 MHzScale Log 1 dB3-10 Test Descriptions HP 8572A EMI Receiver User's Guide