An introduction to the resolution of a digital multimeter
The voltage value corresponding to the last one word on the lowest voltage range of a digital multimeter is called resolution, which reflects the sensitivity of the instrument. The resolution of digital instruments increases with the number of displayed digits. The highest resolution index that a digital multimeter with different digits can achieve is different.
The resolution index of a digital multimeter can also be displayed using resolution. Resolution refers to the percentage of the minimum number (excluding zero) that the instrument can display to the maximum number.
It should be pointed out that resolution and accuracy belong to two different concepts. The former characterizes the sensitivity of the instrument, that is, the ability to recognize small voltages; The latter reflects the accuracy of the measurement, that is, the degree of consistency between the measurement results and the true value. There is no necessary connection between the two, so they cannot be confused, and resolution (or resolution) should not be mistaken for accuracy, which depends on the comprehensive error and quantization error of the internal A/D converter and functional converter of the instrument. From a measurement perspective, resolution is the "imaginary" indicator (independent of measurement error), while accuracy is the "real" indicator (it determines the size of measurement error). Therefore, increasing the number of display digits arbitrarily to improve the resolution of the instrument is not feasible.
