A full scale deflection of an ammeter refers to the maximum reading that the ammeter can display on its scale. It is typically marked as 100% or FSD on the scale and is used as a reference point for measuring current.
Calibrating an ammeter to its full scale deflection ensures that the readings are accurate and reliable. This is because the ammeter is designed to provide the most accurate measurement at its FSD, and any deviation from this point can result in inaccurate readings.
The full scale deflection of an ammeter is determined by the maximum current that the ammeter can measure. It is usually marked on the scale of the ammeter, and the ammeter is calibrated to this point during manufacturing.
No, an ammeter cannot display a reading higher than its full scale deflection. This is because the ammeter is designed to measure currents within a specific range, and any current higher than the FSD can damage the ammeter or give inaccurate readings.
It is recommended to calibrate an ammeter to its full scale deflection at least once a year. However, if the ammeter is being used frequently or in harsh conditions, it is best to calibrate it more frequently to ensure accurate readings.