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Which technique locates a babbling or shorting node?

  • A.Reading the fault codes, which name the module responsible and therefore identify it without further investigation
  • B.A visual inspection
  • C.Progressive disconnection while monitoring the bus with an oscilloscope, which shows when normal signalling returns
  • D.Disconnecting modules in turn until the bus recovers

Answer: D

Unplugging modules one at a time while watching the bus identifies the offender. The last option describes exactly that method with the appropriate instrument, which makes it a correct and fuller statement. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

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