Difference Between Resolution and Display Resolution of Digital Multimeters
A multimeter can be called a multimeter, and of course, a digital multimeter can also be called a digital multimeter. Its English name is DMM, and it is currently a widely used measuring instrument. A digital multimeter is capable of displaying the measured values directly in digital form. It can not only measure various types of current and voltage, but also measure capacitance, resistance, identify various diodes, and detect their quality, etc. Next, we will mainly introduce the basic functions of a multimeter - the difference between resolution and resolution. Let's learn some knowledge together with the editor~
Resolution is the ability of a digital multimeter to distinguish the minimum amount of change being measured. It reflects the sensitivity of the instrument, and the resolution of the instrument varies at different ranges. The instrument has the highest resolution at the lowest range, which is defined as the resolution index of the digital multimeter.
Sometimes, the highest resolution is also known as the sensitivity of an instrument. The resolution of digital instruments increases with the number of display bits.
The resolution index can also be represented by resolution. Resolution refers to the percentage of the minimum and maximum digits that an instrument can display. For example, the DT8900 31/2-digit digital multimeter can display a minimum digit of 1 and a maximum digit of 1999, so the resolution is equal to 1/1999 ≈ 0.05%.
It should be pointed out that there is a difference between resolution and resolution;
For example, the resolution of 31/2 bit and 33/4 bit instruments is the same, both at 100 μ V, but their resolutions are different.
Resolution and accuracy belong to two different concepts. Resolution characterizes the instrument's ability to "recognize" small signals, that is, its "sensitivity", while accuracy reflects the "accuracy" of the measurement, that is, the degree of consistency between the measurement result and the true value. There is no necessary connection between the two and they cannot be confused. In fact, resolution is only related to the number of display bits of the instrument, while accuracy is related to the comprehensive error and quantization error of the internal A/D converter and functional converter of the instrument. In practical applications, higher accuracy and sensitivity are not necessarily better. It also depends on the specific object being tested, otherwise it is a waste.
