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It would be very time-consuming to look for hardware at every interface and address each time the N1500A software is started. This is especially true considering that most people use the same hardware every time. The following process is used by the N1500A software to establish a connection with your analyzer.
When the N1500A software is started, it looks for the same instrument at the same address that was last used when the software was run.
If that instrument IS found, the N1500A software is launched and the connection to that instrument is made. To change instruments, perform a Re-Scan.
If that instrument is NOT found, or when N1500A is first run, then N1500A automatically performs a Hardware Scan.
In addition to the automatic scan when the N1500A software begins, you can initiate a Re-Scan at any time. You would do this to connect to a new instrument or the same instrument at a new address.
In the N1500A software, click Preferences, then Select Instrument, then Re-Scan to list all the instruments that are configured in Keysight IO Libraries.
Instruments that are connected using GPIB are automatically configured in Keysight IO Libraries. Learn how to configure analyzers in Keysight IO Libraries.
Select the Instrument / Interface you want to use, then click OK.