User Manual

Table Of Contents
Spectrum analyzer
11-34 Confidential - For internal use 99-137719-D
11.12.2 Measurement principles
The following subsections summarize the measurement principles used by the
spectrum analyzer. The figure below is used to visualize the different power
definitions.
11.12.2.1 Channel power
The channel power (A) is calculated in dBm as the total power within the selected
bandwidth (bw) of either; 2 kHz, 20 kHz, 200 kHz or 2 MHz.
The channel power value is given in dBm and the value can be extracted from:
.../fft/fft_data via the variable spectrum.header.channel_power.rx1.
Figure 11-14: Power measurements
Selected span (2, 20, 200 or 2000 kHz)
bw
np
bw
pn
Channel Power
Peak Power
Noise power
Phase Noise
Spurios
Max peak
peak 2
Phase
noise
Frequency
bw
spur
bw
3
f
1
f
2
f
3
f
4
Pwr
peak
Pwr
noise
Pwr
cha n
Pwr
pn
Pwr
1
Pwr
2
Pwr
3
Pwr
4
f
o
bw
spur
bw
spur
bw
spur
peak 3
peak 4
peak 5
Spectrum Analyzer measurement principles
A
B
C
D
E