Spin Flip/Fool Proof Lock
From Hall A Wiki
![](/wiki/images/thumb/7/79/ScreenShot69758.png/300px-ScreenShot69758.png)
the main control window.The yellow button on the left side of the window is "Fool Proof Lock". In this case, it's unlocked.
"Fool Proof Lock" is a mechanism designed for spin flip system to protect key system settings from being unattended changed by inexperienced shift work. The main switch is on the main control window.
If the lock is pressed down, it will show text "I'm Expert". Then every function & module will be accessible. Otherwise, it will show text "I'm Rookie". In this case user is only allowed to view the system status and clear errors.
The recommended setting for shift works are "I'm Rookie".