Keysight N9927-90001 User’s Guide 341
VVM (Vector Voltmeter) Mode - Option 308
1-Port Cable Trimming Measurements
1-Port Cable Trimming Measurements
A 1-Port Cable Trimming measurement is used in a cable fabrication procedure
to validate proper electrical length.
How to make a 1-Port Cable Trimming Measurement
1.
Press
Mode
then
VVM
then
1-Port Cable Trimming
.
2.
Press
Freq/Dist
then enter the frequency for the measurement.
3.
To improve measurement stability, change the IF Bandwidth, Output
Power, and Averaging settings as needed.
4.
4.Press
Meas Setup 4
then
Zero OFF
.
5.
Optionally calibrate the FieldFox. Learn more about VVM calibration in
6.
To ensure that the calibration is adequate, perform the following
optional
Measurement Verification
procedure.
a.
Connect a short standard to
PORT 1
where cables to be trimmed
will be connected.
b.
Press
Meas Setup 4
and press
Zero
.
c.
Remove the short standard and connect the open standard.
d.
Confirm that magnitude measurement is less than –0.1 dB and that
the phase value reads 180° degrees.
7.
Attach the shortest cable to the FieldFox
PORT 1
connector. This cable is
the reference cable. Leave the end of the reference cable open
(unterminated).
8.
Press
Meas Setup 4
then press
Zero
.
— The R receiver measures incident
signal (green line) out of the source.
— The A receiver measures reflected
signal (red line) from the end of the
DUT (black line).
— In VVM mode, the display ALWAYS
shows ratioed (A/R) measurements
which is the electrical length of the
DUT.
This measurement verification procedure is suitable for low frequency
measurements. However, for high frequency measurements, a more
sophisticated procedure is required.
Summary of Contents for N9913A
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Page 557: ...Keysight N9927 90001 User s Guide 557 Keysight Software End User Licensing Agreement EULA ...
Page 558: ...558 Keysight N9927 90001 User s Guide Keysight Software End User Licensing Agreement EULA ...
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