2. Be a good controller

To use the laser, two people are needed:

• Operator: the person that starts the laser
• Controller: the person that double-checks the operator

Both roles are needed to work with a laser safely.

In this lesson, we practice being a good controller.

• Find an operator to use the laser
• Read the procedure for the operator

In this session, we never start the laser. All the operator says is 'Laser is on'.

Exercise 1: test the operator

• Let the operator start the procedure
• During countdown, say 'stop'
• You and the operator pass if the laser is not started

Exercise 2: test the operator

• Take off your glasses
• Let the operator start the procedure
• During countdown, say 'stop'
• However, in step 3, the operator must stop the procedure. You and the operator pass if the laser is not started

Exercise 3: test the controller

• The operator takes off his/her glasses
• Let the operator start the procedure
• During countdown, say 'stop'
• However, in step 2, you or the operator must say 'stop' to stop the procedure. You and the operator pass if the laser is not started

Exercise 4: test the controller

• Turn off the air flow
• Let the operator start the procedure
• During countdown, say 'stop'
• However, in step 1, you or the operator must say 'stop' to stop the procedure. You and the operator pass if the laser is not started

Exam

Do the following 5 times:

• A certified operator tells the controller secretly to:
  • Do the right thing
  • Put off glasses
• A certified operator tells the operator secretly to:
  • Do the right thing
  • Put off glasses
  • Turn off the air flow
• Do the procedure
• If the laser is turned on when it should not, the exam is failed