What effect is observed on the recorder when a magnetic sensor is thumped down on equipment?

When a magnetic sensor is thumped down on equipment, the recorder typically displays a downward "ski slope" effect. This response occurs because the sudden impact of the sensor against the equipment generates a transient vibration signal. Initially, the amplitude of the signal rises rapidly as the impact creates a peak due to the sudden change in motion. However, as the vibration decays over time, the amplitude decreases, resulting in a visual representation on the recorder that resembles a slope descending downward.

This behavior is indicative of how vibrational energy dissipates following a shock event. The downward slope signifies a reduction in vibration intensity as the energy from the thump propagates through the equipment and the sensor stabilizes back towards a lower energy state. Understanding this phenomenon is crucial for interpreting vibration data accurately, especially in the context of diagnosing equipment performance and detecting potential issues.

The other options do not accurately represent the result seen on the recorder when a magnetic sensor is subjected to a sudden impact, highlighting the specific nature of the energy dissipation in relation to vibration analysis.