2-Port Insertion Loss Measurements; 2-Port Insertion Loss Measurement - Agilent Technologies FieldFox N9923A User Manual

12. Remove the LOAD and leave the end of the cable to be tested open.
13. Press
14. Use Averaging to remove random noise from high-loss measurements. Press
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 PORT 1 connector, through the DUT, and into
the PORT 2 connector. Both ends of the DUT must be connected to the FieldFox.,
either directly or indirectly using a jumper cable or adapter.
„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
1. Press Mode then CAT.
2. Then
3. Press Freq/Dist and enter
4. Press Sweep 3, then select a
5. Press Cal 5, then perform a calibration. Learn more on page 56.
6. 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 more about measuring long cable lengths at the FieldFox
Supplemental User‟s Guide:
CAT (Cable and Antenna Test) Mode - Option 305
Data –
then
Data Math
removed. These minor imperfections in the cable should not be considered in
the Cable Loss measurement.
BW 2 then Average.
More then Insertion Loss (2-Port)
measurement.
Mem. The ripple in the measurement is
.
Start and Stop frequency values of the
setting.
Resolution
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