R3267 Series Spectrum Analyzer Operation Manual (Vol.1)
4.2 Measuring Adjacent Channel Leakage Power (ACP)
4-3
4.2
Measuring Adjacent Channel Leakage Power (ACP)
This section describes the difference between the operation processes (used for each measurement mode) and
correction operation using the Root Nyquist filter.
4.2.1
Differences between Full Screen and Separate Screen Operation Processes
There are two modes of measuring the adjacent channel leakage power for the analyzer: the Full screen
and Separate screen modes.
The features and internal processes of both modes are as follows.
•
Full screen mode
In this mode, the upper adjacent channel leakage power is calculated as a ratio of the upper adjacent
channel power P
U
(calculated by integrating the trace data over the specified bandwidth) to the total
power P
C
(calculated by integrating the trace data over the entire frequency range on the measurement
screen). In the same manner, the lower adjacent channel leakage power is calculated using the lower
adjacent channel power P
L
instead of P
U
.
Figure 4-3Full Screen Mode
The total power P
C
is calculated by using the formula shown below by adding up the power level at
each point over the entire frequency axis on the screen.
The lower adjacent channel power (P
L
) and the upper adjacent channel power (P
U
) are calculated by
using the formula shown below.
The upper adjacent channel leakage power (Q
U
) and the lower adjacent channel leakage power (QL)
CS: channel space
BS: specified bandwidth
