Transmission Measurements - Keysight N9340B Demo Manual

Section 9
Tracking Generator: Transmission and Reflection Measurements
Figure 7. Transmission measurement setup
A spectrum analyzer with tracking generator can be used to perform compo-
nent tests such as frequency response and gain and loss on components and
subsystems. The tracking generator is a signal source whose RF output follows
(tracks) the tuning of the spectrum analyzer. The N9340B spectrum analyzer
has an optional high-performance, built-in tracking generator (Option TG3),
operating from 5 MHz to 3 GHz. A tuned receiver architecture and narrow IF
bandwidths provide high dynamic range for scalar component test.
The N9340B spectrum analyzer can be used to characterize measure transmis-
sion parameters, such as fl atness and rejection, or refl ection parameters,
such as return loss on devices under test (DUTs). Return loss is an a reflection
measurement requiring a directional coupler or bridge.

Transmission measurements

In the following demo, the rejection of a bandpass fi lter is measured.
In the following demo, a 300 MHz bandpass fi lter is used as a DUT.
The marker readout displays the rejection of the fi lter at 90 MHz above the
center frequency of the band pass.
15
DUT
N9340B
100 kHz - 3.0 GHz
HANDHELD SPECTRUM ANALYZER
1 2 3
ABC DEF GHI
4 5 6
JKL M NO PQR
7 8 9
STU VWX YZ_
0
SAVE LIM IT
PRESET
M ARKER ESC/ CLR
ENTER
BW/
SYS M ODE M EAS TRACE AM PTD SPAN FREQ
SWP