1-Port Cable Trimming Measurements; How To Make A 1-Port Cable Trimming Measurement - Keysight N9923A User Manual

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. Press Meas Setup 4 then
4. Optionally calibrate the FieldFox. Learn more about VVM calibration in
5. 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.
Keysight N9923-90001 User's Guide
VVM
"VVM Calibration" on page
— If using an adapter to connect the cables to the FieldFox, press Cal
5 then select either QuickCal or Mechanical Cal. Follow the FieldFox
calibration prompts. During calibration, the measurement
(S-parameter) is referred to as S11.
— If connecting the cables directly to the FieldFox test port, CalReady
is very accurate.
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 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.
167.
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