The multimeter is a versatile, multi-range measuring instrument. Let's talk about the issues that should be considered when choosing a multimeter.
1, function: use should be selected according to specific requirements.
2. Range and range: The digital multimeter has many ranges, but its basic range accuracy is the highest. Many digital multimeters have an autoranging function that eliminates the need to manually adjust the range, making measurement easy, safe, and fast. There are also many digital multimeters that have over-range capability. When the measured value exceeds the range but the maximum display has not yet reached the maximum display, the range cannot be changed, thus improving the accuracy and resolution.
3. Accuracy: The maximum error allowed by the digital multimeter depends not only on its variable term error, but also on its fixed term error. When choosing, it depends on the requirements of the stability error and linearity error, and whether the resolution meets the requirements. General digital multimeters require 0.0005 to 0.002, at least 61 digits; 0.005 to 0.01, at least 51 digits; 0.02 to 0.05, at least 41 digits; 0.1 Below, there should be at least 31 digits displayed.
4. Input resistance and zero current: The input resistance of the digital multimeter is too low and the zero current is too high, which will cause measurement error. The key depends on the limit value allowed by the measuring device, that is, the internal resistance of the signal source. When the source impedance is high, the instrument with high input impedance and low zero current should be selected to make the influence negligible.
5, series mode suppression ratio and common mode rejection ratio: in the presence of various interferences such as electric fields, magnetic fields and various high-frequency noise or for long-distance measurement, it is easy to mix interference signals, resulting in inaccurate readings, therefore should be based on the use of the environment Select a string and a common mode rejection ratio, especially when performing high-precision measurement, select a digital multimeter with a protection terminal G, which can suppress common mode interference well.
6. Display form and power supply: The display form of the digital multimeter is not limited to numbers, but also can display charts, texts and symbols for on-site observation, operation and management. According to the size of its display device, it can be divided into four categories: small, medium, large and super large.
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