3
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 greater than 40 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
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).
