![](/images/new-backgrounds/1204634/20463433x1.webp)
6 Out-of-Band Alias Exposure Zones
As mentioned above, the user rate sampling modes increase the maximum Main Time length at the expense of possible aliasing of
6.1 Setting up the Alias Exposure Zone Checker
Follow this procedure for setting up the Alias Exposure Zone Checker:
1.Start the VSA application.
2.Click on Utilities\Macros\Recall. Navigate to the Examples\Macros subdirectory in the directory where you installed the VSA application (for example, C:\Program Files\Agilent\89600 VSA\Examples\Macros). Select RecallSetupAfterAliasCheck and AliasChecker files, and click OK.
3.Right click on the top of the VSA application. You will see a popup showing the various toolbars. Select the Macros toolbar. This will make the alias checker icons appear on your VSA application toolbar.
6.2 Using the Alias Exposure Zone Checker
The Alias Exposure Zone Checker calculates the frequencies of the alias exposure zones for any combination of center frequency, span, and digitizer sample rate. It then measures the power in each zone and compares it to the power of the desired signal in the span of the measurement setup at the time the checker was started. An unwanted signal in an exposure zone is a source of interference if it is larger than the desired signal’s amplitude minus 40 dB. This
NOTE: The Alias Exposure Zone Checker cannot be used with the
When the macro stops, a
Any unwanted signal falling inside the zone box is a source of alias interference. If the height of any box is higher than the orange reference line, the power in that zone is greater than the
17