Ako na použitie a multimeter na test či svetlo vodič je normálne alebo nie
The general public is first of all the multimeter will be placed in the voltage AC 250V file, check the lamp line of the fire wire and the zero line voltage is 220V to determine wite the fire wire and the zero line is intact. If the fire wire or zero line open, this method is feasible. avšak, if the contact is poor into zdanlivo zlomený nezlomený, it may príčina nesprávny úsudok. The dôvod je že, kedy the fire wire alebo zero line there is poor contact inches, due to the multimeter voltage gear odpor, take the circuit current is very small, this current is not enough to produce a large voltage drop in the fire wire or nula line poor contact. Preto, the namerané napätie bude stále by o o 220 Ⅴ, raz pod napätím s a zaťaženie z palce, the poor kontakt na napätie pokles pokles zvýši výrazne, the lampy a lampáše napájanie napájanie napätie bude nižší ako 220 Ⅴ viac. Tam bude bude lampy a lampáše do nie práca alebo nie práca riadne, so napätie metóda of meranie, musí byť pod napätím s a zaťaženie meranie.
The second method is more reliable, that is, using the odpor method, the multimeter will be placed in the lowest ohm file such as RX1 file, and school zero, and power off, the switch line and the switch on the fire wire, zero line demontovaný (anti-loop), and then use the multimeter to measure the fire and zero line, intact when zero, intact when zero, linka kontakt je zlý kedy tam je a odpor, the väčší the odpor, the horší jav of slabý kontakt, the odpor is nekonečno, riadok otvorený.
Use a multimeter to detect the lamp line, there are two kinds: one is charged measurement, the table will be played to the AC voltage file, the needle was played to the fire and zero line direct measurement, to see if the voltage is 220 volts, if close to zero volts, indicating that the line has a break point. S elektrický elektrický pero na mieru, ak the dva pramene z the line are red, indicating that the zero line of this strand has was disconnected, carely check the joins to see if they are loose.
Po druhé, napájanie výpadok meranie. The obvod istič napájanie vypnutie, s a multimeter odpor súbor na meranie linka cez, ale toto metóda je nie vhodné, pretože linka je príliš dlhá, ihla môže nie dosah, if the jednotlivec meranie z žiarovka cez môže tiež be.
Komplexné vyššie, vysvetľuje the multimeter to measure the light line, can only use the voltage file to measure the napätie to judge, there are great obmedzenia.
The digital multimeter to AC napätie súbor, the black pen line in the finger wrapped three to five turns, with a red pen to contact the zero line and fire line, for comparison, read the powder of a large one that is for the fire line, the reading of the small one that is for the zero line.
