What is excluded from most aircraft armament circuits test sets?

• A. An oscilloscope
• B. A multimeter
• C. A power supply
• D. A voltmeter

Answer: (B)

Armament circuits operate with fast, transient signals and precise timing to ensure safe arming and disarming. A test set needs instruments that can observe those rapid changes without loading the circuit. An oscilloscope provides real-time waveforms and timing, essential for verifying the sequence and interlocks. A voltmeter can confirm steady DC levels and bias conditions, while a power supply delivers the controlled voltage to simulate the aircraft system. A multimeter, although useful for basic checks, cannot reliably capture fast transient events or provide real-time waveform information, and it can introduce loading that distorts the signal. For these reasons it’s not included in most aircraft armament circuit test sets.