Multimeter test attention issues

When using a multimeter to measure current, you must pay attention to the most important point. Do not confuse the current measurement method with the voltage measurement method, because many novices measure current in the same way as voltage and directly connect the test leads in parallel to the circuit. In this way, if your multimeter is a third-party meter, the fuse will burn out and the shunt resistor in the current block shunt will definitely burn out. If it is a digital meter, even the 7106 may fail. However, if it is a better multimeter, if the current block is used to measure voltage by mistake, the voltage signal will be clamped at 0.7V by the current block protection circuit, and the bidirectional limiting diode will  protect the current block shunt. We know that when measuring current, The voltage measurement method is to set the multimeter to the voltage range, then insert the red test lead into the VΩ hole, the black test lead into the COM hole, and then connect the red and black test leads in parallel into the circuit to measure the voltage. The current is just the opposite. That is to say, if you want to measure the current, use the current range of the multimeter and select the appropriate range. If you don't know the current value, you can choose a larger range to prevent the multimeter from displaying "1" over the range. Then insert the red test lead into the mA hole, or the 10A hole, and the black test lead into the COM hole (the COM hole is called the common end and is specifically used to plug in the black test lead). Then disconnect part of the circuit and connect the red and black test leads in series to measure. That is to say, if you want to measure the current, you must connect them in series to measure. 

Detecting capacitors?  Is it using a digital multimeter to detect whether the capacitor is good or bad?   This depends on whether you are measuring the capacitance or the quality of the capacitor. If you are measuring the capacitance, use the capacitance block to measure the capacitance. Before measuring, short-circuit the capacitor to discharge it, then turn the multimeter to the capacitance block (F), select the appropriate range, and then insert the capacitor into the Cx test jack to measure the capacitance. Generally, for a 100μF capacitor, the measured capacitance is 98 or 99μF, which is normal. If you are measuring the quality of the capacitor, you can choose to use the diode block or the diode block to measure the resistance between the two electrodes of the capacitor to determine whether the capacitor is damaged. If the resistance of the two electrodes of the measured capacitor is 0.01, it means that the capacitor is internally broken down.