Explain why mechanical loading error due to tachometer, Mechanical Engineering

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Explain why mechanical loading error due to tachometer

(a) Explain why mechanical loading error due to tachometer inertia can be significantly higher when measuring transient speeds than when measuring constant speeds.

(b) A dc tachometer has an equivalent resistance R_a = 20 Ω in its rotor windings. In a position plus velocity servo system, the tachometer signal is connected to a feedback control circuit with an equivalent resistance of 2 kΩ. Estimate the percentage error due to electrical loading of the tachometer at steady state.

(c) If the conditions were not steady, how would the electrical loading be affected in this application?

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