What is the maximum duration for ground operations on DC power to protect CRT displays?

• A. 2 minutes
• B. 5 minutes
• C. 10 minutes
• D. 15 minutes

Answer: (B)

Grounding DC power during maintenance provides a safe discharge path and helps protect CRT displays from static buildup and voltage transients when power is reapplied. CRTs and their high-voltage circuitry are sensitive to prolonged ground connections, which can stress components or affect reinitialization. The recommended maximum is five minutes because this window is long enough to perform essential grounding checks and safe handling, yet short enough to minimize thermal and electrical stress on the CRT-related circuitry. Extending the duration beyond this limit increases the risk of damage or reliability issues when power is restored.