R&S QAR50, User Manual

Page: 38 / 67

Measurements and result displays
R&S
®
QAR50
38 User Manual 1179.4992.02 ─ 02
The basic process of a measurement is easy with the R&S QAR50.
1. Configure the measurement as required.
2. Normalize the measurement, if necessary.
3. Place the DUT in the center of the R&S QAR50, between the clusters. For a
detailed description of the test setup, see Chapter 6, "Test setup" , on page 30.
4. Select "Measure" in the user interface.
The R&S QAR50 initiates the measurement.
The basic principle of all measurements is as follows.
a) One of the clusters generates a signal.
b) The cluster transmits the signal in the direction of the DUT.
c) The signal passes through or gets reflected by the DUT.
d) Both clusters measure the level characteristics of the reflected or transmitted
signal.
5. Analyze the measurement results using the result displays .
● Reflection measurement ......................................................................................... 38
● Transmission measurement ....................................................................................39
● Phase measurement ...............................................................................................40
8.2.1 Reflection measurement
The reflection measurement determines the percentage of energy that is being reflec-
ted by the DUT over a certain frequency range used by automotive radar sensors. The
result (reflectivity) is the ratio of the reflected energy to the energy of the stimulus sig-
nal over a certain radar band.
The R&S QAR50 measures the reflection of both sides of the DUT:
●
Cluster 1 sends a stimulus signal and receives the reflected energy from the side
of the DUT that faces cluster 1.
●
Cluster 2 sends a stimulus signal and receives the reflected energy from the side
of the DUT that faces cluster 2.
Measurement