How to choose the current range of a desktop digital multimeter?
1. Introduction to current range of desktop digital multimeter
Desktop digital multimeters usually have multiple current ranges to adapt to the current measurement needs of different devices. These gears usually include: mA, A, 10A, 100A, 1kA, etc. The accuracy levels of these gears will also vary depending on product quality and price.
When using a desktop digital multimeter to measure current, you must first select the appropriate current range. According to the size of the measured current, select the gear that is larger than and closest to it. For example, if you need to measure a current of 50mA in a circuit, you can select the mA range; if you need to measure a current of 100A, you can select the 100A or 1kA range.
2. Things to note when selecting the current range of a desktop digital multimeter
When selecting the current range, in addition to considering the size of the measured current, you also need to pay attention to the following points:
1.Input impedance
When selecting a current level, consider its input impedance. Generally speaking, high input impedance can reduce the impact on the circuit under test and improve measurement accuracy. Therefore, when selecting the current range, you should try to choose products with high input impedance.
2. Accuracy level
Desktop digital multimeters of different brands and prices may have different accuracy levels. When selecting the current gear, you should choose a product with a higher accuracy level based on actual needs. For example, for some application scenarios that require high-precision measurements, you can choose a desktop digital multimeter with a smaller error range.
3.Measurement range
The measurement ranges of different current ranges are also different. When selecting a current range, make sure that its measurement range can cover the size of the current being measured. If the selected range is too small, the measurement results may be inaccurate; if the selected range is too large, it may affect the circuit under test.
