Port Cable Trimming Measurements - Agilent Technologies FieldFox N9913A User Manual

How to select Zeroing
 Press Meas Setup 4
 Then
 Press

1-Port Cable Trimming Measurements

A 1-Port Cable Trimming measurement is used in a cable fabrication procedure
to validate proper electrical length.
FieldFox Block Diagram
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. To improve measurement stability, change the IF Bandwidth, Output Power,
4. Press Meas Setup 4 then
5. Optionally calibrate the FieldFox. Learn more about VVM calibration on page
6. To ensure that the calibration is adequate, perform the following optional
NOTE This measurement verification procedure is suitable for low frequency
measurements. However, for high frequency measurements, a more sophisticated
procedure is required.
7. Attach the shortest cable to the FieldFox PORT 1 connector. This cable is the
8. Press Meas Setup 4 then press Zero.
9. Remove the reference cable from the FieldFox PORT 1 connector.
VVM (Vector Voltmeter) Mode
Zero
Zero OFF
to turn zeroing off.
 The
line) out of the source.
 The
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.
VVM
and Averaging settings as needed.
144.
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.
reference cable. Leave the end of the reference cable open (unterminated).
R receiver measures incident signal (green
A receiver measures reflected signal (red line)
1-Port Cable Trimming.
then
Zero OFF.
145