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Operating the R&S QAR
R&S
®
QAR
54 User Manual 1178.7200.02 ─ 09
d) Do the same for the other two plastic plates labeled B and C.
After each measurement, check the mean transmission loss against the limits a
77
and a
81
specified on the stickers attached to the verification plates. The sticker
shows the attenuation characteristics of the plate and the deviation the result may
have.
Each sticker contains two values.
The first value "a
77
" is the one-way mean attenuation in the frequency range from
76 GHz to 77 GHz.
The second value "a
81
" is the one-way mean attenuation in the frequency range
from 76 GHz to 81 GHz.
The limits for the transmission verification measurement are plate-specific.
If you are using the R&S
QAR-Z43 verification set, the plates also have a third
value (r
77
), which is irrelevant for the verification of the radome measurements that
uses all clusters.
5.2 Single Cluster Radome Measurements
The single cluster application is similar to radome measurements. The difference is
that the single cluster application measures the DUT characteristics using only a single
cluster instead of all 12 clusters.
The typical procedure when measuring a radome (DUT) with one cluster is as follows:
1. Start the R&S QAR to start the system and the measurement application.
For more information about the functionality of the measurement application, see
Chapter 5.2.2, "Graphical User Interface" , on page 56.
2. Normalize the test setup.
For more information about the normalization, see Chapter 5.2.3, "Measurements" ,
on page 57.
3. Measure the DUT.
For more information about the measurement and its results, see Chapter 5.2.3,
"Measurements" , on page 57.
4. Save and restore measurement data.
For more information about saving and restoring measurement data, see Chap-
ter 5.2.4, "Configuration" , on page 60.
5.2.1 Test Setup
The basic test setup for radome measurements consists of the R&S QAR and a DUT
that is placed at a certain distance from the R&S QAR.
Note that there has to be at least 30 cm of free space behind the DUT for valid mea-
surement results.
Single Cluster Radome Measurements