What is a potential consequence of poor grounding in instrumentation systems?

What is a potential consequence of poor grounding in instrumentation systems?

• A. Poor grounding can cause measurement errors and corrosion.
• B. Poor grounding can improve noise immunity.
• C. Poor grounding increases shield effectiveness.
• D. Poor grounding can disable all instrumentation.

Answer: (D)

Grounding provides a stable reference and a low-impedance path for fault currents. When grounding is poor, voltage differences can appear between equipment and the signal ground, allowing noise and stray currents to ride on measurement signals. This can lead to misleading readings and corrosion, but more importantly, fault paths can propagate through the instrumentation network and cause protective devices to trip or the equipment to fail. In a worst-case scenario, the grounding fault can render the entire instrumentation system inoperable or disabled. Poor grounding also degrades noise rejection and shielding performance, so those ideas don’t reflect the actual outcomes as strongly as the potential for a system-wide loss of instrumentation.

Grounding provides a stable reference and a low-impedance path for fault currents. When grounding is poor, voltage differences can appear between equipment and the signal ground, allowing noise and stray currents to ride on measurement signals. This can lead to misleading readings and corrosion, but more importantly, fault paths can propagate through the instrumentation network and cause protective devices to trip or the equipment to fail. In a worst-case scenario, the grounding fault can render the entire instrumentation system inoperable or disabled. Poor grounding also degrades noise rejection and shielding performance, so those ideas don’t reflect the actual outcomes as strongly as the potential for a system-wide loss of instrumentation.