Introduction to the digital multimeter's resolution
Measuring range
In a multi-function digital multimeter, different functions have their corresponding maximum and minimum values that can be measured.
measurement rate
The number of times a digital multimeter measures the measured electricity per second is called the measurement rate, and its unit is "times/s". It mainly depends on the conversion rate of the A/D converter. Some handheld digital multimeters use the measurement period to indicate the speed of measurement. The time required to complete a measurement process is called the measurement cycle.
There is a contradiction between the measurement rate and the accuracy index. Usually, the higher the accuracy is, the lower the measurement rate is, and it is difficult to balance the two. To solve this contradiction, you can set different display digits or set the measurement speed conversion switch in the same multimeter: add a fast measurement file, which is used for the A/D converter with a faster measurement rate; To increase the measurement rate, this method is relatively common and can meet the needs of different users for the measurement rate.
Introduction to the resolution of the digital multimeter
The voltage value corresponding to the last digit of the digital multimeter on the lowest voltage range is called resolution, which reflects the sensitivity of the meter. The resolution of digital digital instruments increases with the increase of display digits. The highest resolution indicators that digital multimeters with different digits can achieve are different.
The resolution index of the digital multimeter can also be displayed by resolution. Resolution is the percentage of the smallest number (other than zero) that the meter can display to the largest 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" tiny voltages; the latter reflects the "accuracy" of measurement, that is, the degree of consistency between the measurement result and the true value. There is no necessary connection between the two, so they cannot be confused, and the resolution (or resolution) should not be mistaken for similarity. Accuracy depends on the comprehensive error and quantization error of the internal A/D converter and functional converter of the instrument. From the perspective of measurement, resolution is a "virtual" indicator (which has nothing to do with measurement error), and accuracy is a "real" indicator (it determines the size of measurement error). Therefore, it is not possible to arbitrarily increase the number of display digits to improve the resolution of the instrument.
