2-2 Cable and Antenna Measurement Setup Cable and Antenna Analyzer
2-4 PN: 10580-00241 Rev. B Cable & Antenna Analyzer MG
RF Immunity High / Low
The instrument defaults to RF Immunity High. This setting protects the instrument from
stray signals from nearby or co-located transmitters that can affect frequency and DTF
measurements. The algorithm used to improve instrument’s ability to reject unwanted
signals slows down the sweep speed. If the instrument is used in an environment where
immunity is not as issue, the RF Immunity key can be set to Low to optimize sweep speed.
Use this feature with caution, as the introduction of an interfering signal might be mistaken
for a problem with the antenna or cable run. If Immunity is set to Low during a normal RL
or VSWR measurement, the instrument will be more susceptible to interfering signals.
Interfering signals can make the measurement look better or worse than it really is.
1. Press the Sweep/Setup main menu key.
2. Toggle the RF Immunity High/Low key.
Data Points
The number of data points can be set to 137, 275, 551, 1102, and 2204 data points. This can be
changed before or after calibration regardless of the display setting. The default setting is
275. This is recommended for most measurements. More data points slow down the sweep
speed. More data points are helpful in DTF as this enables better coverage for the same fault
resolution.
1. Press the Sweep/Setup main menu key.
2. Select 137, 275, 551, 1102, or 2204 data points.
Refer to “Sweep/Setup Menu” on page 2-32 for additional information about the Sweep/Setup
main menu and submenus.
Averaging
Averaging helps to average out the trace and minimize the effect of outliers. Trace averaging
takes the running average of the number of traces indicated in the Averaging Factor. The
Average Count in the status window turns on if Averaging is turned on. When the Average
Count reaches the entered average count, a running average of the last set of sweeps is
performed. Averaging Factor can be set between 1 and 65535.
1. Press the Sweep/Setup main menu key.
2. Press the Averaging/Smoothing submenu key.
3. Press Averaging Factor and enter the number of running averages using the keypad,
then press the Enter key.
4. Press the Averaging On/Off key and toggle Averaging to On.
5. Use the Restart key to start the averaging sequence from the beginning.
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