ELG 2138 Lecture Notes - Lecture 4: Significant Figures, Electromagnetic Interference, Internal Resistance

• School: University of Ottawa
• Department: Electrical Engineering
• Course: ELG 2138
• Professor: jeongwonpark

Document Summary

Every measurement requires an instrument as a physical medium in order to determine a quantity or size. Therefore, it is important that the operator knows the operational principle and the function of his instrument. Let us define first some measurement terminology that will be discussed in more details later. Accuracy: this is the correctness of an instrument in showing a standard reference value. Precision: this is the fitness of an instrument upon which the measurement can be made and relied. Sensitivity: this is the ratio between the variation (or change) of the value indicated by the instrument and the variation of the magnitude actually measured21. Resolution: this is the smallest increment of the measured quantity that can cause a change to the instrument reading. The accuracy of a measurement specifies the difference between the measured and the true value. Deviation from the true value is an indication of how accurately a reading has been made.