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CAT (Cable and Antenna Test) Mode 27

The actual sweep time is shown on the FieldFox screen. See the Screen Tour on

page 18. To increase the sweep time, enter a value that is higher than the actual

sweep time. The increase will not be exactly the amount that you enter, as the

actual sweep time is the composite of many factors.

NOTE Measurement speed specifications do NOT apply in Temperature Control Mode.

Learn more on page 14.

How to set Sweep Time

 Press Sweep 3.

 Then Min Swp Time.

 Enter a value using the numeric keypad.

 Press a multiplier key. Learn about multiplier abbreviations on page 19.

Output Power

Set the power level out of the FieldFox to either High power or Low power.

Generally, the High power level (default setting) is more accurate because the

receivers are measuring farther from the noise floor. However, some devices are

sensitive to high power levels. Use the Low power setting when measuring

amplifiers.

NOTE To help prevent damage to your DUT, when Output Power is changed in CAT

Mode, it is changed to the same value in NA Mode.

How to set Output Power

 Press Meas Setup 4.

 Then Output Power High Low The underlined value is the current setting.

o High Sets output power to approximately +5 dBm.

o Low Sets output power to approximately –25 dBm.

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 Interference Rejection [current setting].

 Then choose from the following:

Agilent Technologies FieldFox N9912A User Manual

Questions and Answers: