Zeroing; 1-Port Cable Trimming Measurement - Agilent Technologies FieldFox N9923A User Manual

Zeroing

Zeroing, also known as Normalization, or Data/Memory, simply "Zeroes" the
Magnitude and Phase display when
measurements are relative to the measurement that was made when Zero was
pressed.
 When performing a 1-Port Cable Trimming operation, a reference cable is
 For 2-port measurements, Zero is typically pressed when a THRU connection is
Press
How to select Zeroing
Press
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
1. Press Mode then
2. Press Freq/Dist and enter the frequency for the measurement.
3. Press Meas Setup 4 then
4. Calibrate the FieldFox: (Learn more about VVM calibration on page 70.)
5. To ensure that the FieldFox is properly calibrated, perform the following
NOTE This measurement verification procedure is suitable for low frequency
measurements. However, for high frequency measurements, a more sophisticated
procedure is required.
VVM (Vector Voltmeter) Mode
connected and measured. Then Zero is pressed, and subsequent cables are
measured and trimmed to match electrical length of the reference cable.
made in place of a DUT. Learn more on page 74.
before performing a QuickCal or Mechanical Cal.
Zero OFF
Press Meas Setup 4
o
Then
Zero
o
to turn zeroing off.
Zero OFF
VVM
If using an adapter to connect the cables to the FieldFox, press Cal 5 then
o
select either
QuickCal
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
o
accurate.
optional Measurement Verification procedure.
a. Connect a short standard to the PORT 1 calibration plane (the
location where the calibration was performed).
b. Press Meas Setup 4 and press Zero.
c. Connect the open standard to the FieldFox PORT 1 connector.
d. Confirm that magnitude measurement is less than –0.1 dB and that
the phase value reads 180 degrees.
Zero is pressed. All subsequent
then 1-Port Cable Trimming.
Zero OFF.
or Cal. Follow the FieldFox calibration
Mechanical
73