4
Measure Return Loss (CAT Mode)
Starting with A.11.25 firmware, for the B
models, the FieldFox output power defaults to -15 dBm.
Return loss can be thought of as the absolute value of
the reflected power as compared to the incident power.
When measuring an OPEN or SHORT, all incident power
is reflected and 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.
1. Connect the Device Under Test (DUT).
2. Select Preset then Preset (Factory) Returns the
FieldFox to known settings.
3. Select Mode then CAT (Cable and Antenna Test)
4. Then Measure 1 then Return Loss (Default
measurement).
5. Press Freq/Dist and enter Start and Stop frequency
values of the measurement.
6. Press Meas Setup 4 then Settings to make
appropriate settings before calibrating.
7. Disconnect the DUT and press Cal 5 then follow the
calibration prompts.
8. Reconnect the DUT (cable to be tested).
Optional
- Add Markers – All Modes except VVM and Power
Meter
- Add Limits – All Modes except VVM and Power
Meter
- Save Settings and Data – All Modes
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