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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
2. Press Freq/Dist then enter the frequency for the measurement.
3. To improve measurement stability, change the IF Bandwidth, Output
4. 4.Press Meas Setup 4 then
5. Optionally calibrate the FieldFox. Learn more about VVM calibration in
6. To ensure that the calibration is adequate, perform the following optional
This measurement verification procedure is suitable for low frequency
measurements. However, for high frequency measurements, a more
sophisticated procedure is required.
7. Attach the shortest cable to the FieldFox PORT 1 connector. This cable is
8. Press Meas Setup 4 then press Zero.
Keysight N9915-90020 User's Guide
VVM
Power, and Averaging settings as needed.
"VVM Calibration" on page
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.
the reference cable. Leave the end of the reference cable open
(unterminated).
— 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.
then
1-Port Cable
Trimming.
Zero
OFF.
615.
617
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