How to avoid short circuit when measuring the voltage of each line on the circuit board with a multimeter
1. Sharp multimeter tip as possible
When I was still in school, I followed a habit of my senior brother, which was that I liked to polish the metal tips of all my multimeter probes very sharply. The sharp multimeter tip can minimize the contact area with the circuit board, and for some small surface mount components, measuring can prevent the tip from being too thick and accidentally touching adjacent contacts
2. Find extra black pens and transform them into crocodile clips
Find an extra pair of probes, cut open the black probe with the end in hand, and use a crocodile clip to weld it on for later use. Of course, if you don't want to make it yourself, you can buy ready-made ones, including red and black pens.
To measure the voltage of a circuit board, first determine whether the part to be measured is a DC voltage or an AC voltage. If it is a DC voltage, set the multimeter to the DC voltage measurement mode, and then hold a black pen in one hand and a red pen in the other hand. The black pen is the grounding terminal, and try to find a nearby grounding point that is easy to contact. Generally, circuit boards with larger grounding points are used. Separate the red pen to measure the circuit that needs to be measured. At this point, the sharper the multimeter tip, the more convenient it is to measure some fine surface mount component circuits. If it is inconvenient for both hands to hold the probe separately, then as we mentioned earlier, a spare probe with a crocodile clip can be used. Connect the black probe with a crocodile clip, clamp the crocodile clip to the grounding point of the circuit board, and the red probe can measure the entire DC circuit freely.
If you encounter a particularly thin circuit and do not have a sharp enough pen tip, you can find a sewing needle and wrap it around the pen tip with a thin copper wire without insulation, which can also be used for measurement.
