What is the monthly laser guard interlock test tolerance?

• A. Functional
• B. 1%
• C. ±1 mm
• D. 2%

Answer: (A)

For a monthly laser guard interlock test, the important factor is that the protection system works as intended, not that a numeric measurement falls within a set range. The correct approach is a functional test: you verify that opening the guard door or triggering the interlock reliably shuts off the laser and prevents restart until the guard is properly reset. There isn’t a numeric tolerance like a percent or a distance for this test because interlocks are binary safety devices—they either function correctly or they don’t. Numeric options would imply calibration targets that don’t apply to the interlock’s safety function, which is why the functional criterion is the proper choice.