Return Loss/Vswr - Anritsu MS2024B Manual

Field Measurements
5-7

Return Loss/VSWR

Return Loss is used to characterize RF components and systems. The Return Loss indicates
how well the system is matched by taking the ratio of the reflected signal to the incident
signal, measuring the reflected power in dB. The 1-port Measurement data can also be
displayed linearly as VSWR. In addition, this information can be transferred to a PC for
additional analysis by using Master Software Tools.
Procedure
1. If a test port extension cable is to be used, then connect it to the VNA Port 1 connector
on the instrument.
2. Ensure that the instrument is in Vector Network Analyzer mode. Then press the Shift
key and the System (8) key.
3. Press the Application Options soft key. The Meas Menu soft key toggles between Field and
VNA. The active measurement function is underlined.
Press the soft key (if necessary) until Field is underlined. The Measure menu now
displays Field measurement functions.
4. Press the Measure function hard key (main menu key).
5. Pres the Display Type soft key (submenu key) and select Single from the list box.
6. Press the Measurement Type soft key. From the Graph Type Selector list box, select
Return Loss.
7. Press the Freq/Dist function hard key and set the Start Frequency and Stop Frequency.
8. Press the Sweep function hard key and then the Data Points soft key to set the number
of data points (the larger the number of data points, the longer the maximum distance,
at the expense of a slower sweep speed).
9. Press the Shift key, then the Calibrate (2) key.
10. Press the Start Cal soft key and perform a 1-port calibration at the connector or at end of
the extension cable. Follow the instructions on the display or, for more details, refer to
"Calibration Considerations" on page
11. When the Calibration is finished, CAL: ON (OK) should be displayed with the trace data
in the instrument settings summary at the left side of the sweep window, and the trace
should be centered around 0 dB when the short or open is connected.
12. Connect the test port extension cable to the Device Under Test (DUT).
13. Use the File menu to save the measurement. Refer to the file management instructions
in the user guide for your instrument.
Vector Network Analyzer MG
4-16.
PN: 10580-00289 Rev. K
5-7 Return Loss/VSWR
5-9