Meaning of various indicators of digital multimeter
Accuracy (precision), resolution (resolution), measurement range, 3 and 1/2 describe the indicators of a digital multimeter, and what does it mean?
The said 3 and 1/2 digit multimeter can display only 1 or 0 in the first digit of 0000 to 1999, 3 represents one digit, ten digit, and hundred digit can display 0-9 digits, and 1/2 represents thousand digit can only display 0 and 1. Read as' three and a half '. This type of pocket digital multimeter includes DT830A, DT830C, DT890D, etc.
The display digits of a digital multimeter are usually 3 1/2 to 8 1/2 digits. There are two principles for determining the display digits of a digital instrument: firstly, the digits that can display all digits from 0 to 9 are integer digits; The second is that the numerical value of the fractional digit is based on the highest digit in the maximum displayed value as the numerator, and when measuring at full scale, the value is 2000. This indicates that the instrument has 3 integer digits, while the numerator of the decimal digit is 1 and the denominator is 2, so it is called 3 1/2 digits, pronounced as "three and a half digits". Its highest digit can only display 0 or 1 (0 is usually not displayed). The highest digit of a 32/3 digit (pronounced as "three and two-thirds digits") digital multimeter can only display numbers ranging from 0 to 2, so the maximum display value is ± 2999. In the same situation, it is 50% higher than the limit of a 3 1/2 digit digital multimeter, especially valuable for measuring 380V AC voltage.
For example, when measuring power grid voltage with a digital multimeter, the highest digit of a regular 3 1/2 digit digital multimeter can only be 0 or 1. To measure 220V or 380V power grid voltage, only three digits can be used for display, and the resolution of this range is only 1V. In contrast, using a 3 3/4 digit digital multimeter to measure grid voltage, the highest digit can display 0-3, which can be displayed in four digits with a resolution of 0.1V, which is the same as the resolution of a 4 1/2 digit digital multimeter.
Popular digital multimeter generally belongs to handheld multimeter with 3 1/2 digit display, while 4 1/2 and 5 1/2 digit (below 6 digits) digital multimeter can be divided into handheld and desktop types. Most of the 6 1/2 digits or above belong to desktop 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 readings, but also conforms to people's reading habits, and can shorten the reading or recording time. These advantages are not possessed by traditional analog (i.e. pointer) multimeters.
