1. Iddetermina jekk iċ-ċirkwit jew apparat huwiex iċċarġjat jew le
Skond għal dan karatteristika , it jista ' be użat bħala a test pinna.
Il użu is kif ġej: turn the multimeter to AC20V, leave the black test lead in the air, hold the red test lead in contact with the circuit or device on the side, then the multimeter will display, the multimeter will display, if the displayed number is between a a few volts and more than ten volts (different multimeters will There are different displays), indicating li the line or device is charged. If the the volts display is zero or very small, it jindika li the line or device is not charged.
2. Iddistingwi jekk il qawwa provvista linja huwa il live wajer jew il newtrali wajer
Il- ewwel metodu: Int can use the above method to judge: the larger number is the live wire, and the smaller number is the neutral wire. This method requires contact with the line or device being measured.
It- tieni metodu: no contact with the circuit or device being measured is required. Set the multimeter to AC2V, leave the black test pen hanging in the air, hold the red test pen hold the red test pen and gently slide the pen tip along the line. If the meter shows a few volts, it means that the line is a live wire.
Jekk it shows only a few tenths of a volt or even less. This means that the line is the zero line. This judgment method not have direct contact with the line. Not only safe but also convenient and fast.
3． Sib breakpoints in cables
Meta a breakpoint occurs in a cable, the traditional method is to use a multimeter to electrically block the cable section by section to find the breakpoint. This not only wastes time, but also damages the cable insulation to a great extent. Using the sensing characteristics of a digital multimeter, you can quickly find the disconnection point of the cable.
L-ewwel uża elettriku imblukkar biex tiddetermina liema kejbil qalba wajer huwa miftuħ. Imbagħad qabbad wieħed tmiem il il miftuħ qalba wajer il l AC220V enerġija provvista , u sett il - multimeter għal l-AC2V pożizzjoni. Il Iswed test huwa sospiż l- l- ... arja . Żomm l-aħmar test pinna u bil-mod slide il- pinna ponta il- linja . F'dan ħin , jekk il-miter juri kemm ħafna Vultaġġ jew a ftit għaxra ta ' a volt (differenti skont fuq il- kejbil) . Jekk il il - wiri fuq il-meter f'daqqa qtar a lott meta nimxu għal a ċertu pożizzjoni , nota din pożizzjoni % 3a Taħt normali ċirkostanzi. Il break punt huwa bejn 10 u 20cm quddiem ta ' din pożizzjoni .
Dan metodu jista ' ukoll be użat biex issib il - break punt ta' a difettuż elettriku kutra jew oħra reżistenza wajer.
4． Measure the frequency of UPS power supply
Għal UPS power supply. The stability of the voltage at its output terminal is an important parameter, and the frequency of its output is ukoll important.
Madankollu, int ma tistax direttament tuża il frekwenza block of a digital multimeter to measure għax the voltage li il frequency block can withfor is very low. Only a few volts.
Int can connect a 220V/6V or 220V/4V step-down transformer to the output end of the UPS power supply to reduce the voltage mingħajr changing il frequency of the power supply. Then connect the frequency block to the output of the transformer to measure the frequency of measure the frequency of the measure the frequency of the UPS power supply. .
