HP 8590 E-Series, Calibration Manual

Page: 315 / 693

42. Displayed A verage Noise Level,
HP 8595EM
This performance verication test must be performed with the EMC analyzer set
in the spectrum analyzer mode.
This test measures the displayed average noise level in both frequency bands .
The EMC analyzer input is terminated in 50 . In Band 0 (9 kHz to 2.9 GHz), the
test rst measures the average noise at 400 kHz and 1 MHz in zero span. The LO
feedthrough is used as a frequency reference for these measurements . F or the
rest of Band 0 and for all of the remaining bands , the test tunes the analyzer
frequency across the band, uses the marker to locate the frequency with the
highest response , and then reads the average noise in zero span.
T o reduce measurement uncertainty due to input attenuator switching and
resolution bandwidth switching, a reference level oset is added. The CAL OUT
signal is used as the amplitude reference for determining the amount of oset
required. The oset is removed at the end of the test by pressing 4
PRESET
5 .
Equipment Required
Cable , BNC, 23 cm (9 in)
T ermination, 50
A dapter , Type N (m) to BNC (f)
Figure 2-64. Displayed A verage Noise Level T est Setup , HP 8595EM
2-286 P erformance V erication T ests