Avoidance of short circuits by measurement of the voltage of each line on a circuit board with a multimeter
1, as much as possible sharp multimeter pen tip
In my reading is still in school, I followed my brother's a habit, that is, I like to bar all their own multimeter pen metal front end are polished very sharp, sharp multimeter pen tip, can be as small as possible to contact the circuit board area, for some of the small area of patch component measurement can prevent the tip of the pen is too thick resulting in accidentally touching the adjacent contacts. So that if you are afraid of polishing the meter pen is easy to oxidise, nowadays there are businesses have thought of, there are special tip gold-plated meter pen for sale.
2, find extra black pens, black pens transformed into crocodile clips
Find a pair of extra pens, the black pen, the end of the hand holding the pen, cut, find a crocodile clip to weld on, spare. Of course, if you do not want to do it yourself, then you can buy ready-made, red and black pens have.
Measure the voltage of the circuit board, first judge the part of the circuit board to be measured is the DC voltage or AC voltage, if it is DC voltage, first of all, the multimeter's gear settings, hit the DC voltage measurement gear, and then a hand to take the black pen in one hand to take the red pen, the black pen are grounded, as close as possible to find easy to put in contact with the grounding point, the general grounding point of the circuit board are relatively large. Red pen and then separate to measure the circuit that needs to be measured. At this time, the more sharply polished multimeter tip, measuring some of the fine patch components circuit, the more convenient. If the two hands are not convenient to take the pen separately, this time we said earlier, the production of spare with alligator clips of the pen at this time can come in handy, the black pen with alligator clips connected to the alligator clips to the circuit board on the ground, the red pen can be measured at will the entire DC circuit.
If you encounter a particularly thin circuit, and there is no sharp enough pen tip, you can find a sewing needle, with no insulation of thin copper wire to sewing needle winding fixed in the pen tip of the pen, so that can also be measured.
