Before determining whether a short circuit is the cause of the problem, we can look at what a short circuit is. A short circuit is when a circuit or part of a circuit is short-circuited. After a short circuit, the current in the circuit will develop a sharp rise. If a switch is not tripped in time and the short circuit manages to exist for a long period of time,how to test pcb board with a multimeter, the circuit will heat up and may smoke and burn major parts of the equipment, or even the business may catch fire causing a social fire.
Checking for short circuits with a multimeter actually determines the size of the line by measuring the resistance. Since the resistance of a multimeter cannot be measured in real time, resistance measurements must be taken with the power off. There are the following ways to use a multimeter to determine a short circuit on a daily basis.
1. The digital multimeter's on-off gear can be used to measure, need to determine whether there are two short circuit measurement points. If the multimeter buzzes, the resistance is close to zero, you can basically determine a short circuit pcblink 1oz vs 2oz Copper.
2. For mechanical multimeter, you can switch the instrument to X-1 file resistance, and make two multimeter pens short circuit and zero, if the measured resistance value is close to zero, basically can be judged as a short circuit.
Notes on the use of multimeter
1. If the measured resistance has a certain value but is very small, it is impossible to confirm whether there is a short circuit with the above method, such as AC/DC motor and induction coil, it is difficult to judge whether there is a short circuit with this method.
2, if in the measurement, the multimeter pen pressure tightened a little measured data results will become smaller, the pen to relax their own a little measured results will become larger, this is the enterprise because the pen and the measured wire is not connected to the contact resistance of the connection point is also measured in. In order to be able to minimize the engineering measurement system error, restore the authenticity of the results of the study, the measurement of the meter pen and the measured object wire must establish a close connection relationship. If the measured conductor corrosion problem or direct oxidation ability is serious, to scrape off the conductor surface oxide layer. Normal development of copper is bright golden yellow, after being oxidized technology presents dull black, aluminum wire is also China the same.