Six Key Operational Points and Operating Principles of Multimeters
A multimeter is a commonly used electrical measuring instrument, mainly composed of a meter head, measuring circuit, conversion switch, and test probes, and is widely used in industries such as power, machinery, and manufacturing. Today we will specifically introduce the 6 key points of using a multimeter, hoping to help users better apply the product.
1. When measuring current and voltage, do not rotate the wrong gear. If the resistance or current range is mistakenly used to measure voltage, it is extremely easy to burn out the meter. When the multimeter is not in use, it is recommended to shift the gear to a higher AC voltage to avoid damage due to improper use.
2. When measuring DC voltage and DC current, pay attention to the polarity of "+" and "-" and do not connect them incorrectly. If the pointer is found to be reversed, the meter rod should be replaced immediately to avoid damaging the pointer and the meter head.
3. If the magnitude of the measured voltage or current is unknown, a higher gear should be used first, and then the appropriate gear should be selected for testing to avoid excessive deflection of the pointer and damage to the meter head. The closer the selected gear is to the measured value, the more accurate the measured value will be.
4. When measuring resistance, do not touch the bare ends of the component (or the metal parts of the two meter bars) with your hands to avoid parallel connection of human resistance and the measured resistance, which may result in inaccurate measurement results.
When measuring resistance, if two meter bars are short circuited and the "zero ohm" knob is adjusted to the maximum, but the pointer still cannot reach the 0 point, this phenomenon is usually caused by insufficient battery voltage inside the meter. A new battery should be replaced to accurately measure.
When the multimeter is not in use, do not turn it to the resistance mode, as there is a battery inside. If not careful, it can cause the two meter bars to collide and short circuit, which not only consumes the battery but can also damage the meter head in severe cases.
