How to use the multimeter method to detect circuit board failure points

When the power is out, set the multimeter on the buzzer (if there is no buzzer, use a resistor) and point the black and red probes at the ends of the circuit to be tested. If the buzzer sounds, the circuit is shorted (if a resistor is used, the resistance is zero or close to zero)how to test pcb board with a multimeter.

To this how to use the multimeter for testing equipment maintenance and various system failures of the circuit board, sometimes have to be based on different fault phenomena, flexible mastery of the use of the multimeter management methods and techniques, this question lists a few such as the following:

Now take the digital table as an example: for example, a circuit board power outage, in the case of circuit board power outage, first of all, the multimeter of the corresponding resistor file, check whether the insurance is damaged, whether the varistor is damaged, and so on.

If the above measurements are normal, then the multimeter to the diode file, check whether the diode is damaged. First, connect the anode of the diode with a red iron pen, connect the cathode of the diode with a black iron pen. At this time, the normal diode should show 0.5 mV ~ 0.7 mV normal, otherwise bad tube, analogous to the measurement of four diodes.

If the above measurements are normal, then in the measurement circuit, the multimeter to the corresponding DC voltage file, with a black pen connected to the circuit board, the red pen to the point being measured, for example: measuring the voltage after the rectifier filter.

Multimeters play an important role in checking electronic circuit faults and measuring current. With the power on, insert the red probe into the current test port of the multimeter pcblink 1oz vs 2oz Copper, then set the multimeter to the current range and connect the black and red probes of the multimeter in series to the circuit where the current needs to be measured.