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CAT (Cable and Antenna Test) Mode
2-Port Insertion Loss Measurements
13.Press
14.Use Averaging to remove random noise from high-loss measurements.
The displayed trace shows the Cable Loss values in one direction through the
cable. A Return Loss measurement would show the loss for both down the
cable and back. Therefore, a Cable Loss measurement is the same as a Return
Loss measurement divided by 2.
The average Cable Loss across the specified frequency range is shown on the
screen below the graticules.
2-Port Insertion Loss Measurements
A 2-port Insertion Loss measurement is used to measure the loss through a
DUT (device under test) – or cable – over a specified frequency range. The
FieldFox signal source is transmitted out the RF OUT connector, through the
DUT, and into the RF IN connector. Both ends of the DUT must be connected
to the FieldFox, either directly or indirectly using the cable used in the
normalization cal.
'Insertion' loss simply means loss through a device, usually expressed in dB. It
is exactly the same measurement as "S21 Transmission" in NA Mode.
2-port Insertion Loss measurements are generally more accurate than 1-port
Cable Loss measurements.
How to make a 2-port Insertion Loss Measurement
— Press Mode then CAT.
— Then
— Press Freq/Dist and enter
— Press Sweep 3, then select a
— Press Cal 5, then perform a calibration. Learn more on
— Connect the DUT and view the insertion loss measurement results.
When measuring very long lengths of cable, it may be necessary to increase
the sweep time. Learn how on
Help:
Keysight N9927-90001 User's Guide
Data Math
then
removed. These minor imperfections in the cable should not be considered
in the Cable Loss measurement.
Press BW 2 then Average.
More
then
Insertion Loss
measurement.
Calibration" on page
123.
http://na.support.keysight.com/fieldfox/help/SupHelp/FieldFox.htm
Data –
Mem. The ripple in the measurement is
(2-Port).
Start
and
Stop
frequency values of the
Resolution
setting.
page
52. Learn why in the Supplemental Online
"How to Perform a
57
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