R3267 Series Spectrum Analyzer Operation Manual (Vol.1)
4.2.1 Differences between Full Screen and Separate Screen Operation Processes
4-4
are calculated by using the formula shown below.
•
Separate 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 within the specified bandwidth of the reference chan-
nel). In the same manner, the lower adjacent channel leakage power is calculated using the lower ad-
jacent channel power P
L
instead of P
U
.
When measuring each power, the frequency span is set to the specified bandwidth and the center fre-
quency is set to the channel frequency of each channel. In addition, the reference level is decreased by
20 dB to improve the dynamic range when measuring the adjacent channels. (The reference channel is
displayed on the upper screen, and each of the adjacent channels is displayed on either side on the low-
er screen.)
This mode requires more time to take measurements, though measurement accuracy is higher than Full
screen mode.
Figure 4-4Separate Screen Mode
The reference channel power (P
C
), the upper and lower adjacent leakage power (P
U
and P
L
, respective-
ly), the upper and lower adjacent channel leakage power (Q
U
and Q
L
, respectively) is calculated by
using the formula shown below.
CS: channel space
BS: specified bandwidth