The meaning of each indicator of a digital multimeter
Accuracy (precision) resolution (resolution) measurement range, 3 and 1/2 describes what indicator of a digital multimeter and what does it mean?
The 3 and 1/2 digital multimeter can display 0000-1999. The first digit can only display 1 or 0. 3 represents the ones, tens and hundreds digits and can display numbers from 0 to 9. 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 number of display digits of a digital multimeter is usually 3 1/2 digits to 8 1/2 digits. There are two principles for determining the number of display digits of a digital instrument: one is that the number of digits that can display all numbers from 0 to 9 is an integer number; the other is that the value of the fractional digit is based on the highest digit of the maximum displayed value. is the numerator, and the count value when using the full scale is 2000. This 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, pronounced as "three and a half digits". ", its highest bit can only display 0 or 1 (0 is usually not displayed). The highest digit of a 3 2/3-digit (pronounced "three and two-thirds digit") digital multimeter can only display numbers from 0 to 2, so the maximum display value is ±2999. Under the same circumstances, it is 50% higher than the measurement limit of a 3 1/2-digit digital multimeter, which is especially valuable when measuring 380V AC voltage.
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. If you want to measure 220V or 380V grid voltage, you can only use three digits to display the resolution of this range. only 1V. In contrast, when a 3 3/4-digit digital multimeter is used to measure the grid voltage, the highest digit can display 0 to 3, which allows a four-digit display with a resolution of 0.1V, which is different from the resolution of a 4 1/2-digit digital multimeter. The force is the same.
Popular digital multimeters are generally handheld multimeters with a 3 1/2 digit display. 4 1/2 and 5 1/2 digit (less than 6 digits) digital multimeters are divided into handheld and desktop types. 6 1/2 digits and above are mostly 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 reading or recording time. These advantages are not available in traditional analog (i.e. pointer) multimeters.
