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How to select Zeroing
1-Port Cable Trimming Measurements
A 1-Port Cable Trimming measurement is used in a cable fabrication procedure
to validate proper electrical length. Read the Overview section in this chapter to
learn more about this measurement and the calibration process.
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,
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
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.
14. Confirm that magnitude measurement is less than –0.1 dB and the phase is
Perform Cable Trimming:
118
Press Meas Setup 4
o
Then
Zero
o
Press
to turn zeroing off.
Zero Off
o
VVM
press Cal 5 then select
Cal. Follow the FieldFox calibration prompts.
OSL
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
Data Math
then
is the phase difference in degrees between the Open standard and the Short
standard at that frequency. Remember this value!
within .1 degrees of the value from step 9.
then
1-Port Cable
Trimming.
Zero
OFF.
Type,then either
Calibration
then
Data/Mem
Zero
(+ Load) or
QuickCal
Data -> Mem
N9912A FieldFox User's Guide
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