R&S ESU Series Operating Manual page 127

R&S ESU
Examples of APD
When there is no input signal at the measuring receiver, the envelope of the receiver
noise is shown as in
responding APD response of the receiver noise is shown in
axis of the APD function displays the probability that the disturbance envelope
exceeds the disturbance level.
Fig. 4.28 Zero Span of receiver noise
Fig. 4.29 APD of receiver noise
If one impulse is received within 1% of time, as shown in
drastic extension to the right side at the bottom of
bance level but at low probability. The difference between
their peak value (X
4.96
Fig. 4.27 with zero span mode at center frequency fc. The cor-
), it appears dominantly on the abscissa of APD.
max
Instrument Functions
Fig. 4.29. The ordinate
Fig. 4.30, the APD shows
Fig. 4.31, indicating a high distur-
Fig. 4.28 and
Operating Manual 1302.6163.12 - 03
APD Mode
Fig. 4.30 is