TZT LCD Digital Capacitor ESR Tester Internal Resistance Meter Test In Circuit ''Product selling point: The cube is powered by 9V battery, the working current of the whole machine is only 6mA, and the short-circuit test pen is turned on with one key to complete the automatic zero adjustment. Synchronous detection is used as the test signal, and the displayed value is the real ESR value. The three-level range is automatically matched, the range is 0.01-99 ohms, the resolution of the 0.01-0.99 ohm range is 0.01 ohm, the resolution of the 1-9.9 ohm range is 0.1 ohm, and the resolution of the 10-99 ohm range is 1 ohm. The measurement pulse amplitude is lower than 0.7V, which satisfies the reliability of measuring the capacitor ESR value on the road. Both ends of the test lead are provided with protective elements to prevent the capacitor from being charged and damage the meter. If the measurement operation is not performed for a long time, the ESR meter will automatically shut down. How to use the ESR meter: first short-circuit the two test leads, then turn on the power to complete the automatic zero adjustment. Compare the data measured on-circuit (off-circuit) with the ESR (equivalent series resistance) value of the standard capacitor (see bottom table). If the measured value is much larger than the standard value; for example, 8 times, it means that the capacitor has aged and needs to be replaced. If it is much smaller than the standard value, there is likely to be leakage. The above measurements can be measured in the circuit. What is the ESR of a capacitor? Any capacitor has some resistance to the alternating current paing through it. ESR (equivalent series resistance) is the sum of the ohmic resistance inside the capacitor. An ideal capacitor has zero ESR. The model for such a capacitor consists of a resistor in series with an ideal capacitor. Since the electrolyte will gradually dry up with the long-term use of the electrolytic capacitor, the ESR of the electrolytic capacitor will gradually increase over time. High ESR is a common problem in today's electronic circuits. It is the ESR increase of 1-2 euros, or it may be a complicated problem with electronic equipment. Under normal conditions, the value of ESR is very low, but after many years, or the rubber seal is not good, the electrolyte will gradually dry up, so the ESR will gradually increase. An increase in ESR increases the voltage drop acro the capacitor, causing heat generation. If you don't check the ESR, your repairs are going to be tough. High ESR is a sign of capacitor failure. High ESR can also lead to complex electrical failures, such as overheating of capacitors, increased circuit loading, making other circuit components work improperly, and so on. Why use an ESR table? Because ordinary analog or digital meters can make you mistake bad parts for good ones when measuring electrolytic capacitors, it will waste a lot of time and repair equipment. If you don't test the ESR, you're miing bad capacitors. Often these bad capacitors have high ESR, which you can't measure with a normal multimeter or digital capacitance meter. The ESR of a capacitor can only be measured with an ESR meter. The ESR meter can be measured online, which means you don't need to solder down the capacitors. Shipping list: ESR table X1''