Return Loss Measurements; How To Measure Return Loss; 1-Port Cable Loss Measurements - Keysight N9913A User Manual

CAT (Cable and Antenna Test) Mode

Return Loss Measurements

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.

How to Measure Return Loss

— Connect the jumper cable or any adapter used to connect the device under
— Select Preset then
— Select Mode then
— 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.

1-Port Cable Loss Measurements

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.
A deteriorated cable is not usually apparent in a Distance to Fault
measurement, where more obvious and dramatic problems are identified. A
Cable Loss measurement is necessary to measure the accumulated losses
throughout the length of the cable.
Keysight N9927-90001 User's Guide
test (DUT).
Preset
CAT/TDR
Return Loss (Default measurement).
measurement.
calibrating.
calibration prompts.
Returns the FieldFox to known settings
(Cable and Antenna Test)
Start and Stop frequency values of the
Settings to make appropriate settings before
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