3-6 VNA Measurements - Cable Loss (Field Menus Only) Chapter 3 — Vector Network Analyzer
3-14 MS20xxA VNA Master UG 10580-00166 Rev. C
Cable Loss (Field Menus Only)
The transmission feed line insertion loss test verifies the signal attenuation level of the cable.
This test can be done using the Cable Loss or Return Loss Measurement with a short or an
open connected at the end of the system. The advantage of using the Cable Loss measurement
is that the VNA Master takes care of the math and that no computations are needed. Cable
Loss is a Return Loss measurement that also takes into consideration that the signal travels
in both directions. Refer to “Measurement Menu (Field Menus)” on page 3-45.
Procedure
1. If a test port extension cable is to be used, then connect it to the RF Out connector on the
VNA Master.
2. Ensure that the instrument is in Vector Network Analyzer mode and press the
Shift key
and the
System (8) key, then press the Application Options soft key.
3. The
Meas Menu soft key toggles between Field and VNA. The active measurement
function is underlined.
4. Press the soft key (if necessary) until Field
is underlined, then press the Back key.
5. The Measurement soft key menu now displays field measurement options.
6. Press the
Measurement function hard key and select Cable Loss.
7. In Figure 3-8, the Measurement soft key menu shows
Cable Loss selected (small red light
simulated in soft key face). Also, the instrument settings summary displays “Cable
Loss 5.8 dB” to the left of the measurement display area.
8. Press the
Freq/Dist function hard key and set the Start Frequency and Stop Frequency.
9. Press the
Shift key, then the Calibrate (2) key.
10. Press the
Start Cal soft key and perform a 1-port OSL calibration at the connector or at
end of the extension cable. Follow the instructions on the display or refer to Chapter 3
for more details.
11. When the Calibration is finished,
Cal Status On should be displayed in the upper part of
the instrument settings summary, 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 Transmission Line.
10580-00166C.book Page 14 Thursday, February 21, 2008 12:52 PM
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