# Hardware Self Tests

The Self Tests dialog box is used to troubleshoot oscilloscope hardware problems.

In the unlikely event that your oscilloscope needs service, Keysight's service team may instruct you to perform one or more of the diagnostic tests that are listed in the dialog box.

Click Run to run the selected tests.

Click Loop to automatically repeat the selected test the number of times indicated in the Loops entry. If Stop Looping on Failure is selected, the test will end on a failure and display additional information.

The instrument self tests can also be run remotely using the `*TST?` remote query or the `:SYSTem:TEST` command.