The related introduction of the resolution of digital multimeter
The voltage value corresponding to the last word of the digital multimeter in the lowest voltage range is called resolution, which reflects the sensitivity of the instrument. The resolution of digital instruments increases with the increase of display bits. Digital multimeters with different digits can achieve different maximum resolution indexes.
The resolution index of digital multimeter can also be displayed by resolution. Resolution refers to the percentage of the smallest number (except zero) and the largest number that can be displayed by the instrument.
It should be pointed out that resolution and accuracy belong to two different concepts. The former represents the "sensitivity" of the instrument, that is, the ability to "identify" tiny voltages; The latter reflects the "accuracy" of the measurement, that is, the consistency between the measurement results and the true values. The two are not necessarily related, so they cannot be confused, and the resolution (or resolution) should not be mistaken for accuracy, which depends on the comprehensive error of the A/D converter and function converter inside the instrument and the quantization error. From the measurement point of view, resolution is a "virtual" indicator (independent of measurement error), and accuracy is a "real" indicator (it determines the size of measurement error). Therefore, it is not possible to increase the number of display bits at will to improve the resolution of the instrument.
Introduction of measuring internal resistance of lithium battery with multimeter
1. Electricity measurement: electricity measurement is mainly to measure the quality of its charge and discharge, adjust it to ohm gear, and then connect its two feet with two probes respectively. At this time, the number of the meter will gradually increase and finally become infinite, and then change the probes. The situation is the same as before.
2. Resistance measurement: The main purpose of resistance measurement is to measure whether its resistance value is accurate, adjust it to ohm gear, and connect its two feet casually with a stylus to see whether the reading of a multimeter is the same as the actual resistance value of the resistance.
3. Inductance measuring coil: The inductance measuring coil is mainly used to measure whether it is conductive or not, and it is also an ohm gear. Just connect its two feet with a stylus. In plain English, the inductance is a wire, and its resistance should be very small.
4. Measuring transformer: Measuring transformer and inductance have many similarities.
