132 N9912A FieldFox User’s Guide
How to select Zeroing
o Press Meas Setup 4
o Then Zero
o Press Zero Off to turn zeroing off.
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 VVM then 1-Port Cable Trimming.
2. Press Freq/Dist and enter the frequency needed for the VVM measurement.
3. Press Meas Setup 4 then Zero OFF.
4. If using an adapter or jumper cable to connect the cables to the FieldFox,
press Cal 5 then select Calibration Type,then either QuickCal (+ Load) or
OSL Cal. Follow the FieldFox calibration prompts.
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
the VMM measurement frequency. For example, for a 1 GHz measurement,
enter Start .8 GHz and Stop 1.2 GHZ
3. Perform a calibration using a cal kit (NOT Quick Cal).
4. Press Meas 1 then Format Phase
5. Connect the Short standard to the RF OUT calibration plane.
6. Press Trace 6 then Math and Memory then Data -> Mem
7. Connect the Open standard to the RF OUT calibration plane.
8. Press Data Math then Data/Mem
9. Press Marker then scroll the marker to the VVM frequency. The Y-axis value
is the phase difference in degrees between the Open standard and the Short
standard at that frequency. Remember this value!
10. Press Mode then VVM.
11. Connect the Short standard to the RF OUT calibration plane.
12. Press Meas Setup 4 then press Zero
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
within .1 degrees of the value from step 9.
Perform Cable Trimming:
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