Zero FireWire Judgment
It only needs a red test pen to judge the zero live wire. After comparing the voltage, the high voltage is the live wire and the low voltage is the zero wire.
(Note: The voltage fluctuation is different in each place, so the voltage value is different, and the voltage increases when the black test pen is inserted)
Zero FireWire Judgment
It only needs a red test pen to judge the zero live wire. After comparing the voltage, the high voltage is the live wire and the low voltage is the zero wire.
(Note: The voltage fluctuations in different places are different, so the voltage value is different, and the voltage increases when the black test pen is inserted.
AC voltage measurement
Measurement range (0.001V-750V) Black test pen plugged into COM public terminal, red test pen plugged into VQF terminal The national standard stipulates that the allowable value of the voltage deviation is: the allowable deviation of the 220V single-phase power supply voltage is + 7%, -10% of the rated voltage)
DC voltage measurement
Measuring range (0.001V-1000V) black test lead plugged into COM common end, red test lead plugged into VQF end (note: there is a positive and negative difference in DC voltage, when the LCD displays "one"
At this time, the red test pen is connected to the negative pole, and the swap test pen "No. 1" eliminates the 9V dry battery close to 10V when fully charged, and the 1.5V dry batteries of No. 7 and 5 are generally about 1.6V when fully charged)
NCV non-contact electrical inspection
The NCV function is equivalent to the function of a non-contact induction electric pen, which is to detect whether the wire is live (fire line) without breaking the skin of the wire or touching the electrode. On line induction, the ncv function that is in front of the breakpoint (FireWire) will alarm, and the ncv function after the breakpoint is not (FireWire), and the sensing distance is 2CM-5CM