Introduction to Resolution of Digital Multimeters
The voltage value corresponding to the last digit of 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 maximum resolution index that can be achieved by a digital multimeter with different digits is different.
The resolution indicator of a digital multimeter can also be displayed using resolution. Resolution refers to the percentage of the minimum number (excluding zero) and maximum number that an instrument can display.
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" small voltages; The latter reflects the "accuracy" of the measurement, that is, the degree of consistency between the measurement results and the true values. 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 "virtual" indicator (independent of measurement error), while accuracy is the "real" indicator (which determines the size of measurement error). Therefore, it is not feasible to increase the number of display bits arbitrarily to improve the resolution of the instrument.
Introduction to the header of a multimeter
The head of a multimeter is a sensitive ammeter. The dial on the meter head is printed with various symbols, scale lines, and numerical values. The symbol A - V - Ω indicates that this electric meter is a multimeter that can measure current, voltage, and resistance. There are multiple scale lines printed on the dial, among which the resistance scale line marked with "Ω" on the right end is zero, and the left end is ∞. The distribution of scale values is uneven. The symbol "-" or "DC" represents direct current, "~" or "AC" represents alternating current, and "~" represents the common scale line between alternating current and direct current. The lines below the scale line represent the scale values corresponding to the different gear positions of the selector switch.
