Interference Rejection; Coupled Frequency - Keysight N9923A FieldFox User Manual

Coupled Frequency

This setting, especially useful for a Return Loss & DTF measurement, allows both
measurements to have different frequency ranges.
How to set Coupled Frequency
With a Return Loss & DTF measurement present:
 Press Meas Setup 4
 Select the DTF measurement (Tr2) using the ▲|▼ arrows.
 Then choose from the following:



Interference Rejection

Use this setting when you suspect that other signals in the area are interfering with a
measurement. Interference 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 choose from the following:
50
Then enter a value using the numeric keypad, the ▲|▼ arrows, or the rotary
o
knob.
Press Enter.
o
- Both the Return Loss and DTF traces have the same
Coupled Freq ON
frequency range settings.
(default setting) - Both traces are allowed to have individual
Coupled Freq OFF
frequency range settings. When set to OFF:
The Return Loss measurement frequency settings are made in the usual manner.
o
Learn how on page 46. When a new Start or Stop frequency is selected,
Coupled Frequency is automatically set to OFF.
The DTF measurement is made using the frequencies as determined by the DTF
o
Frequency Mode setting. Learn more on page 56.
Interference Rejection [current
No interference rejection and fastest possible sweep speed.
Off
o
The lowest level of Interference rejection.
Minimum
o
The medium level of Interference rejection.
Medium
o
The highest level of Interference rejection.
Maximum
o
setting].
FieldFox User's Guide