Voltmetre sensitivity refers to the ability of a voltmeter to accurately measure small changes in voltage. It is an important aspect of voltmeters because it determines the precision and accuracy of voltage measurements.
Voltmetre sensitivity is typically measured in volts per division (V/d) or millivolts per division (mV/d). This measurement is determined by dividing the voltage range of the voltmeter by the number of divisions on the scale.
The sensitivity of a voltmeter can be affected by various factors such as the quality and precision of its internal components, the type of circuit being measured, and external factors like temperature and humidity.
Increasing the sensitivity of a voltmeter allows it to measure smaller changes in voltage, resulting in a more precise and accurate reading. This is particularly useful when measuring small or fluctuating voltages.
Input impedance refers to the amount of resistance a voltmeter has to the current flowing through it. Generally, a higher input impedance will result in a higher sensitivity, as there is less resistance to the current, allowing for more accurate voltage measurements.