Portable spectrum analyzer Arinst SSA-TG R2 6 April 2019
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19
7.8.3. Depending on the equipment to which the generator output signal is applied, set the signal pow-
er value in the range from -15 to -
25 dBm. Setting the parameter is performed by “scrolling” the values to
a fixed selected area.
Note. To measure the standing wave ratio, you must use a directional coupler or measuring bridge (not
included in the package). In our example in figure 19, the
KROKS KSB 2700
measuring bridge is specifi-
cally designed for use with ARINST spectrum analyzers.
7.8.4. Select the
SWR
mode in which you want to measure, as shown in figure 21. On the screen un-
der the grid, the information label will display the
SWR
mode and the warning
UNCAL (not calibrated).
7.8.5. To reduce the influence of connecting cables and connectors on the measurement results, it is
necessary to calibrate.
Note. It is allowed to perform the calibration once for the SWR and S11 modes, provided that the con-
nectors and cables of the circuit under test do not change.
Connect the output of the signal generator (1)
TG OUT
of the device to the input of the directional
measuring bridge
TO TG OUT
according to the wiring diagram in figure 19. Output of the reflected signal
from the measuring bridge port
TO RF IN
connect to the antenna input of the device (2)
RF IN
.
Connect in series the loads from the standard set of calibration loads (not included in the package) to
the input of the measuring bridge
TEST
:
- Open standart and press the
Open
command on the screen;
- Short standart, and press the
Short
command on the screen;
- Load standart and click
Load
command.
After calibration, the background of the
Open
,
Short
and
Load
commands will turn yellow.
Note. To cancel calibration, again click on one of the commands Open, Short and Load. The yellow
background of the command changes to the original background color of the menu.
On the screen under the grid in the information label will display the
SWR
mode and the message
Freq. Lock (frequency cannot be changed)
(figure 22). Connect the test equipment
(DUT)
to the
TEST
port of the measuring bridge and measure the standing wave ratio.
igure 22 Displaying the standing wave ratio in the SWR mode
Note. After calibration, setting the frequency range and amplitude values of the test signal in SWR
mode becomes unavailable. Set the frequency range and amplitude values of the test signal before cali-
bration.
Note. When connecting other connectors and cables, it is necessary to re-calibrate.
7.8.6. To exit from the menu for measuring the standing wave ratio
SWR
, press the button (14)
«MENU»
.
