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Technicians Handbook - Historic Naval Ships Association

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Figure 1-41—3:1 Lissajous patterns and calculation of frequency ratio.THE OCTOPUS.—The octopus is a small, homemade test set used with an oscilloscope to checkelectronic components in circuit. It can be made easily and cheaply using parts from the supply system.Figure 1-42 is a schematic of an octopus that uses either a 6.3-volt filament transformer or an audiooscillator for input power. The benefits of in circuit troubleshooting with an octopus are (1) reducedmaintenance time, (2) less chance of damage from soldering-iron heat, and (3) a visual display of thecomponent's condition.1-131

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