What should be done before testing the smoke detector control panel?

Before testing the smoke detector control panel, it is crucial to wait 15 seconds. This waiting period is important because it allows the system to stabilize and ensures that any transient signals or conditions have settled. Smoke detectors often require a certain amount of time to process their internal checks and ensure that they are functioning properly. Waiting ensures that the system is ready to accurately respond to the testing without interference from previous readings or errors that could occur if testing is done immediately.

Choosing 15 seconds strikes a balance that is generally recommended in industry standards and practices, making it the appropriate timeframe to ensure the reliability and effectiveness of the smoke detector control panel during testing.