Prevencinės Priemonės Už Multimetras Rodyklė Lenkimas Ir Metras Galva Deginimas
Kai naudojant a multimetras, jei the operation is improper, the pointer will be bent, and in serious cases, the meter head will be burned.
In order to prevent such accidents, pay attention to the following items when use the multimeter:
1) Prieš matavimas, įvertis dydis iš the object to be išmatuotas, ir turn the range switch to the appropriate range.
If you don't know the size to be measured, you can turn the range to the maximum first, and then slow approach the appropriate range.
Pastaba kad kada matavimas a didelis objektas su a mažu diapazonu, it is labai tikėtina to lenkti the pointer.
2) Kai matavimas varža, the circuit under test must be cut off from the power supply.
3) Kai testavimas aukšta įtampa arba aukšta srovė, it is draudžiama pasukti the range switch. In order to prevent the contacts from arcing and damage the switch.
4) Kai matavimas the elektrolitinis kondensatorius, it turėtų būti trumpasis jungimas ir iškrovimas prieš matavimas.
5) Kai the multimetras is naudojamas neteisingai, the metras galva gali būti sudeginta.
Precautionary measures: connect two silicon diodes in parallel at the positive and negative ends of the meter head for protection (one forward parallel and one reverse parallel).
The conduction voltage of the silicon diode is generally greater than {{0}}.5V, and the forward resistance of the silicon diode is very large below 0.5V, which has little effect on the original internal resistance of the meter and can basically be ignored.
When the error is measured, the voltage rise will reduce the forward resistance of the silicon diode, and most of the current will be shunted by the diode to protect the meter.
