How To Make A 1-Port Cable Loss Measurement - Keysight B Series User Manual

CAT (Cable and Antenna Test) Mode
1-Port Cable Loss Measurements
A 2-port Insertion Loss measurement is usually more accurate than a 1-port
Cable Loss measurement. However, to perform a 2-port Insertion Loss
measurement, both ends of the cable must be connected to the FieldFox.
In high-loss conditions, a Cable Loss measurement becomes 'noisy' as the
test signal becomes indistinguishable in the FieldFox noise floor. This can
occur when measuring a very long cable and using relatively high
measurement frequencies. To help with this condition, use High Power
(page

How to make a 1-port Cable Loss Measurement

1. Press Preset then Preset.
2. Then
3. Connect the cable to be tested.
4. Press Freq/Dist and enter
5. Press Sweep 3 then
6. Remove the cable to be tested.
7. Press Cal 5, then
8. Follow the prompts to perform calibration at the end of the jumper cable
9. Connect the cable to be tested.
Low-level standing waves (also known as 'ripple') which may be visible in
reflection measurements, can hide the actual loss of the cable. Steps 10
through 13 can minimize the ripple. Perform the measurement with and
without steps 10 through 13 and choose the method with the least amount
of ripple.
10.Connect a LOAD at the end of the cable to be tested. This limits the
11.Press Trace 6 then
12.Remove the LOAD and leave the end of the cable to be tested open.
13.Press
Keysight N9938-90003 User's Guide
45) and Averaging.
More then Cable Loss (1-Port)
measurement.
Min Swp
trace is visible on the screen. The amount of time that is required increases
with longer cable lengths. Learn more in the Supplemental Online Help:
http://na.support.keysight.com/fieldfox/help/SupHelp/FieldFox.htm
Mechanical
or adapter. Learn more about Calibration in
Calibration" on page 89
reflections to faults that are located in the cable under test.
Math and Memory
into Memory.
Data Math then
removed. These minor imperfections in the cable should not be considered
in the Cable Loss measurement.
(page 42).
Start and Stop frequency values of the
Time. Increase the Sweep Time until a stable
Cal. Mechanical Cal.
"How to Perform a
then Data->Mem
Data – Mem. The ripple in the measurement is
to store the trace
49