Describe the process of performing a Doble test on a circuit breaker and what specific parameters are measured.

A Doble test, named after the Doble Engineering Company, is a comprehensive electrical test performed on circuit breakers to assess the condition of their insulation and mechanical components. The process involves applying various voltage and current signals to the circuit breaker and measuring the response. Preparation is key; the breaker must be isolated and de-energized following lockout/tagout procedures. The test set, a specialized piece of equipment, is connected to the breaker's terminals, typically phase-to-phase and phase-to-ground. The test sequence usually includes several steps. Power factor testing assesses the condition of the insulation. ....