Return Loss Measurements - Keysight FieldFox B Series 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.
Keysight N9938-90006 User's Guide
— The Return Loss measurement frequency settings are
made in the usual manner. Learn how at
Range" on page
selected, Coupled Frequency is automatically set to OFF.
— The DTF measurement is made using the frequencies as
determined by the DTF Frequency Mode setting. Learn
more in
test (DUT).
Preset
CAT/TDR
Return Loss (Default measurement).
measurement.
calibrating.
calibration prompts.
53. When a new Start or Stop frequency is
"DTF Measurement Settings" on page
Returns the FieldFox to known settings
(Cable and Antenna Test)
Start and Stop frequency values of the
Settings to make appropriate settings before
"Frequency
66.
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