Q: This MESR-100 meter is used to measure the capacitance ESR value. Can it measure the capacitance?
A: Mesr-100 is a very precise meter for measuring capacitance ESR value. It specially measures capacitance ESR value, not capacitance!
In addition, in the LED display screen in the figure below, the letters in the next line show "470.0uf". This value is not the capacity value of the measured capacitance. This value is only a reference value, which means that if the measured capacitance is less than 470.0uf, it means that the capacitance is good, and this "good" is only a relative concept!
Q: Can this mesr-100 meter measure the capacitance ESR value online? In addition, do you need to discharge before measuring capacitance?
A: Mesr-100 can measure the capacitance ESR value online or remove the capacitance for measurement. Both cases are OK because its probe output voltage is very small. Before measuring the capacitance, especially for high voltage, you need to discharge the capacitance. If you don't know how to discharge the capacitance, you can baidu.
Q: How to understand ESR value? When is the ESR value good and when is the ESR value bad?
A: Every manufacturer hopes that the smaller the ESR value of its capacitor, the smaller the ESR value. However, in the process of production, it is inevitable that some impurities or other factors will cause that the capacitor is not 100% pure capacitance. Just like gold, the gold content in pure gold can only be said to be 99.99...%, which is impossible. The same is true for capacitors. There will be
A small resistance is formed, which is what we call the capacitance internal resistance ESR. It is not that the larger the ESR, the worse our capacitance will be and the more unusable it will be. This depends on what occasion you use it. For example, if we have a few cents capacitance, the internal resistance is 1 ohm. Is the internal resistance large? It's very large, but if we use it in the internal wave circuit of a circuit board, it's no problem and can also be used; What if we want to use it in the stereo? This internal resistance is too large. An internal resistance of 1 ohm is too large for the voltage fluctuation of the sound, so a capacitor with small internal resistance is needed in the sound. Therefore, there is no absolute standard to judge whether a capacitor ESR value is good or bad. Judge according to your actual situation!
Q: Why is there interference with the value I measured? Sometimes the reading is always changing?
A: this watch is a very precise ESR table. Many test environments in Chinese mainland are more disturbing, such as electricity.
The source line is not grounded, electromagnetic interference, etc. the foreign test environment is much better than that in China, and the customer's evaluation is good.
In this case, the handling method is as follows:
1. Keep away from high-power electrical appliances or the environment with large electromagnetic interference;
2. During measurement, the short circuit of the test wire is cleared, and the measurement is carried out when the reading is close to 0;
3. The test wire shall be as short as possible;
4. When measuring, try to keep the test wire stable and do not move.
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HK-LRF 
