The meaning of each indicator of digital multimeter
Accuracy (precision) resolution (resolution) measurement range, 3 1/2 describes what indicators of the digital multimeter, and what does it mean?
The said 3 1/2 digital multimeter can display 0000-1999, the first digit can only display 1 or 0, 3 represents the number of ones, tens, and hundreds, and can display numbers from 0 to 9, and 1/2 represents thousands. Only 0 and 1 can be displayed. Pronounced "three and a half". Such pocket digital multimeters include DT830A, DT830C, DT890D, etc.
The display digits of digital multimeters are usually 3 1/2 digits to 8 1/2 digits. There are two principles for judging the display digits of a digital instrument: one is that the digits that can display all digits from 0 to 9 are integer digits; It is the numerator, and the count value is 2000 when the full scale is used, which indicates that the meter 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, and it is read as "three and a half digits. ”, its highest bit can only display 0 or 1 (0 is usually not displayed). 3 2/3 digits (pronounced as "three and two-thirds digits") The highest digit of the 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, especially when measuring 380V AC voltage is very valuable.
For example, when using a digital multimeter to measure the grid voltage, the highest digit of an ordinary 3 1/2-digit digital multimeter can only be 0 or 1. To measure the 220V or 380V grid voltage, only three digits can be used to display the resolution. 1V only. In contrast, using a 3 3/4-digit digital multimeter to measure the grid voltage, the highest digit can display 0 to 3, which 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 are generally handheld multimeters with 3 1/2 digits, and 4 1/2 and 5 1/2 digits (less than 6 digits) are divided into handheld and desktop. More than 6 1/2 digits are mostly desktop digital multimeters.
The digital multimeter adopts advanced digital display technology, the display is clear and intuitive, and the reading is accurate. 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 available in traditional analog (ie, pointer) multimeters.
