How to measure current with a multimeter?
Use a multimeter to test the color resistance on the motherboard. 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 use the same current measurement method as the voltage measurement method. The test leads are connected in parallel to the circuit, so if your multimeter is a no-name meter, the fuse is burned, and the shunt resistor in the current block shunt must be burned.
If it is a digital meter, even the 7106 will have to hang up, but if it is a better multimeter, if the voltage is measured incorrectly with the current block, the voltage signal will be protected by the current block protection circuit, and the bidirectional limiting diode is clamped at 0.7V to protect the current block shunt. The method of measuring the voltage is to turn the multimeter to the voltage block, 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 to the circuit to measure the voltage, the current is just the opposite.
If you want to measure the current, use the current block of the multimeter, and select a good range appropriately. If you don’t know the current value, you can choose a larger range to prevent the multimeter from displaying “1” over the range, and then insert the red test lead into the mA hole, or 10A hole, The black test lead is inserted into the COM hole, (the COM hole is called the common terminal and is specially inserted into the black test lead jack), and then a part of the circuit is disconnected, and the red and black test leads are connected in series for measurement.
