In electronic measurements, the digital multimeter (DMM) is a favorite among many electronic engineers. Without a digital multimeter, projects cannot be completed. However, when first learning to use a digital multimeter, it is easy to misunderstand how to read its digits. Let’s learn how to read it!
1. Integer Digit Count
Definition: The digits that can display all numbers from 0 to 9 are considered integer digits.Example: If a digital multimeter has a maximum display value of 19999, it has 4 integer digits.
2. Fractional Digit Resolution
Definition: The value of fractional digits is represented by the highest digit in the maximum display value as the numerator and the highest digit in the full-scale range as the denominator.Example: 4 and 1/2 digits: maximum display value is 19999, full-scale count value is 20000, the highest digit can only display 0 or 1. 3 and 1/2 digits: the highest digit can only display 0 or 1, maximum display value is 1999. 3 and 2/3 digits: the highest digit can display 0 to 2, maximum display value is 2999. 3 and 3/4 digits: the highest digit can display 0 to 3, maximum display value is 3999. 5 and 1/2 digits, 6 and 1/2 digits, and so on.
3. Usage Recommendations
Avoid Under-Range: When selecting a range, ensure that the measured value is within the instrument’s display range to avoid inaccurate measurements.Avoid Over-Range: Do not choose too large a range to prevent the instrument from being unable to accurately display the measured value.
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