Meters and troubleshootingQuestion 743 of 1506

Why can a 0-10 V tachogenerator signal not use a live zero?

  1. A tachogenerator makes a constant 1 V
  2. The tach needs a 24 V supply
  3. The tach signal is always AC
  4. A tachogenerator makes no voltage when it is not turning
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Correct answer: A tachogenerator makes no voltage when it is not turning

At standstill the output is zero, so zero cannot stand for a fault.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 9.4: Tachogenerators

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Questions last reviewed: 18 October 2026