The main indicators of digital multimeter display digits and display characteristics
The display digits of a digital multimeter are usually 3 1/2 to 8 1/2 digits. There are two principles for judging the display digits of digital instruments: one is that the digits that can display all numbers from 0 to 9 are integer digits; is the numerator, and the count value is 2000 when the full scale is used, which shows that the instrument has 3 integer digits, and the numerator of the fractional digit is 1, and the denominator is 2, so it is called 3 1/2 digits, read as "three and a half digits ", the highest bit can only display 0 or 1 (0 is usually not displayed). 3 2/3 digits (pronounced "three and two-thirds digit"), the highest digit of a digital multimeter can only display numbers from 0 to 2, so the maximum display value is ±2999. Under the same conditions, it is 50% higher than the limit of a 3 1/2 digit digital multimeter, which is especially valuable when measuring 380V AC voltage.
For example, when measuring grid voltage with a digital multimeter, the highest digit of an ordinary 3 1/2-digit digital multimeter can only be 0 or 1. If you want to measure 220V or 380V grid voltage, you can only use three digits to display it. only 1V. In contrast, using a 3 3/4-digit digital multimeter to measure the grid voltage, the highest digit can display 0 to 3, so that it can be displayed in four digits with a resolution of 0.1V, which is different from a 4 1/2-digit digital multimeter. same force.
Popular digital multimeters generally belong to hand-held multimeters with 3 1/2 digits display, and 4 1/2 and 5 1/2 digits (below 6 digits) digital multimeters are divided into two types: handheld and desktop. More than 6 1/2 digits are mostly benchtop digital multimeters.
The digital multimeter adopts advanced digital display technology, with clear and intuitive display and accurate reading. It not only ensures the objectivity of the reading, but also conforms to people's reading habits, and can shorten the reading or recording time. These advantages are not available in traditional analog (ie pointer) multimeters.
