Return Loss Measurements; How To Measure Return Loss; 1-Port Cable Loss Measurements - Keysight A Series User Manual

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CAT (Cable and Antenna Test) Mode

Return Loss Measurements

Return loss can be thought of as the absolute value of the reflected power

compared to the incident power.

When measuring an OPEN or SHORT, all incident power is reflected and

approximately 0 dB return loss is displayed.

When measuring a LOAD, very little power is reflected and values of 40 dB to

60 dB are displayed.

The minus sign is usually ignored when conveying return loss. For example, a

component is said to have 18 dB return loss, rather than –18 dB.

— Connect the jumper cable or any adapter used to connect the device under

— Select Preset then

— Select Mode then

— Press Freq/Dist and enter

— Press Meas Setup 4 then

— Disconnect the jumper cable or DUT and press Cal 5 then follow the

— Reconnect the jumper cable or DUT.

— The return loss trace is displayed on the FieldFox screen.

While all cables have inherent loss, weather and time will deteriorate cables

and cause even more energy to be absorbed by the cable. This makes less

power available to be transmitted.

Keysight N9927-90020 User's Guide

— The DTF measurement is made using the frequencies as

determined by the DTF Frequency Mode setting. Learn

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