Traditional Culture Encyclopedia - Traditional festivals - What is measurement? There are several main measurement methods.
What is measurement? There are several main measurement methods.
1. Direct measurement method
Direct measurement means that the measurement results can be obtained from the measured data. If a voltmeter is used to measure voltage and an ohmmeter is used to measure resistance, it is a direct measurement method. Direct measurement is simple and fast, but the accuracy is low.
2. Compare measurement methods
Comparative measurement is a method to compare the measured with the measurer in a comparative instrument to get the measured value. The comparative measurement method has high accuracy and sensitivity and is suitable for precise measurement, but the equipment is complicated and the operation is troublesome.
3. Indirect measurement method
Indirect measurement can only measure the electricity related to measurement, and then calculate the measured value. If the resistance is measured by "Voltammetry", the voltage at both ends of the resistance and the current in the resistance are measured first, and then the measured resistance value is calculated according to Ohm's law.
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