🔍 Key Concepts

• Magnetron operation – how current changes with magnetic field strength and voltage (B1 level) • Duty cycle and average current – relationship between pulse width, repetition rate, and meter deflection • Difference between pulse amplitude and average current shown on the meter

💭 Think About

• If the meter shows an increase in magnetron current, what does that say about the average power being delivered to the magnetron? • Which of these options would tend to increase electron flow through the magnetron, and which would reduce it? • How does changing the magnetic field strength generally affect magnetron current – does weaker field allow more or fewer electrons to reach the anode?

✅ Before You Answer

• Identify which choices would clearly reduce average current (and therefore can be ruled out). • Consider how a change in duty cycle (on-time vs off-time) affects the average current, not just the peak current. • Think about whether a higher B1 voltage or a weaker magnetic field would more naturally lead to greater magnetron current and thus higher meter deflection.