Keysight N9912A User Manual page 145

How to make a 1-Port Cable Trimming Measurement
Setup:
1. Press Mode then
2. Press Freq/Dist and enter the frequency needed for the VVM measurement.
3. Press Meas Setup 4 then
4. If using an adapter or jumper cable to connect the cables to the FieldFox, press
Verification: Perform the following optional steps to ensure that the FieldFox is
properly calibrated. Steps 1 through 9 need only be done once to determine the
difference in phase between the Open and Short standard. Once that value is known,
perform steps 10 through 14 to verify a calibration.
1. Press Mode then NA. Select S11.
2. Press Freq/Dist and enter start and stop frequencies that span about 40% of
3. Perform a calibration using a cal kit (NOT Quick Cal).
4. Press Meas 1 then
5. Connect the Short standard to the RF OUT calibration plane.
6. Press Trace 6 then
7. Connect the Open standard to the RF OUT calibration plane.
8. Press
9. Press Marker then scroll the marker to the VVM frequency. The Y-axis value is
10. Press Mode then VVM.
11. Connect the Short standard to the RF OUT calibration plane.
12. Press Meas Setup 4 then press
13. Connect the Open standard to the RF OUT calibration plane.
VVM (Vector Voltmeter) Mode – Option 308
FieldFox Block Diagram
VVM
Cal 5 then select
Calibration
Cal. Follow the FieldFox calibration prompts. Learn more about VVM calibration
on page 144.
the VMM measurement frequency. For example, for a 1 GHz measurement, enter
Start .8 GHz and Stop 1.2 GHZ
Format Phase
Math and Memory
then
Data Math Data/Mem
the phase difference in degrees between the Open standard and the Short
standard at that frequency. Remember this value!
 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.
Type,then either
then
Data -> Mem
Zero
(+ Load) or
QuickCal OSL
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