Interference Rejection; System Impedance - Agilent Technologies FieldFox N9912A User Manual

Interference Rejection

Use this setting when you suspect that other signals in the area are interfering
with a measurement. This may look like a spike or lack of stability in the
measurement trace. While monitoring a measurement at a specific frequency,
toggle this setting between ON and OFF. If the measurement result decreases
while ON, then there is an interfering signal in the area. Continue to make
measurements with Interference Rejection ON. However, this will slow the
measurement speed.
Once enabled, up to SIX sweeps may be required before the interfering signal is
neutralized.
This setting can be changed at any time without affecting calibration accuracy.
How to set Interference Rejection
 Press Meas Setup 4.
 Then
 Then scroll to Interference Rej and press
 Then press
System Impedance (Z0)
To accurately view data presented in Smith Chart format, first set the System
Impedance.
Learn how to select Smith Chart format on page 40.
Learn how to make 75Ω measurements at the FieldFox Supplemental Online
Help:
How to set System Impedance
 Press Meas Setup 4.
 Then Settings.
 Then scroll to System Z0 and press
 Then type either 50 or 75 and press
Port Extensions
Port extensions allow you to electrically move the calibration reference plane on
port 1 after you have performed a calibration.
Phase measurements, and therefore Port Extensions, are NOT available on port
2.
46
ISettings
Interference Rej [current setting]
following:
No interference rejection and fastest possible sweep speed.
Off
o
The lowest level of Interference rejection.
Minimum
o
Medium The medium level of Interference rejection.
o
The highest level of Interference rejection.
Maximum
o
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N9912A FieldFox User's Guide