Measuring range and sampling rate of digital multimeter
measuring range
In a multifunctional digital multimeter, different functions have their corresponding maximum and minimum values that can be measured.
Measurement rate
The number of times a digital multimeter measures the amount of electricity being measured per second is called the measurement rate, which is measured in seconds. It mainly depends on the conversion rate of the A/D converter. Some handheld digital multimeters use measurement cycles to indicate the speed of measurement. The time required to complete a measurement process is called the measurement cycle.
There is a contradiction between measurement rate and accuracy indicators, usually the higher the accuracy, the lower the measurement rate, and it is difficult to balance the two. To solve this contradiction, different display bits or measurement speed conversion switches can be set on the same multimeter: a fast measurement mode can be added, which is used for A/D converters with faster measurement speeds; By reducing the number of display bits to significantly improve measurement speed, this method is commonly used and can meet the needs of different users for measurement speed.
Attention to use
1. Before using a multimeter, it is necessary to perform a "mechanical zeroing", which means that when there is no measured power, the multimeter pointer should be placed at the zero voltage or zero current position.
2. During the use of a multimeter, do not touch the metal part of the probe with your hands. This ensures accurate measurement and personal safety.
3. When measuring a certain amount of electricity, it is not advisable to shift gears at the same time, especially when measuring high voltage or high current. Otherwise, it will damage the multimeter. If you need to shift gears, disconnect the probe first and then measure after shifting gears.
4. When using a multimeter, it must be placed horizontally to avoid errors. At the same time, it is also important to avoid the influence of external magnetic fields on the multimeter.
5. After using the multimeter, the conversion switch should be set to the maximum AC voltage setting. If not used for a long time, the battery inside the multimeter should be removed to prevent corrosion of other components inside the meter.
