Why doesn't the stylus light up on the zero line?
Not only is there current passing through, but it is equal in magnitude to the current in the fire wire, because the zero wire is in series with the fire wire and the appliance, and the current is equal everywhere in a series circuit. If you don't believe me, measure it with an ammeter. As for why the stylus can not be measured, it is very simple, because the stylus is used to distinguish between the fire wire and the zero wire, or to determine whether the conductor is connected to the fire wire, and can not determine whether there is no current. When the stylus tip metal body contact with the fire wire or fire wire connected to the conductor, from the fire wire through the stylus, the human body to the earth constitutes a circuit, because the fire wire and the earth between the 220V voltage, there is a weak current from the fire wire through the stylus and the human body flow to the earth, the stylus neon tube glows, however, with the fire wire in the current is not the same thing. When the stylus tip of the metal body in contact with the zero line, because there is no voltage between the zero line and the earth, so there will be no current flowing through the stylus, stylus neon tube will not glow.
What is the use of digital stylus?
Answer: The correct use of digital stylus should master the following.
(1) button description.
(A key) DIRECT, direct measurement button (far from the LCD screen), that is, the pen directly to contact the line, please press this button.
(B) INDUCTANCE, inductive measurement button (closer to the LCD screen), i.e., press this button if you use the tip of the pen to touch the line inductively.
Note: regardless of how the pen printed on the word, please remember that far from the LCD screen for the direct measurement of health; closer to the LCD for the induction button can be.
(2) digital stylus is suitable for direct detection of 12 ~ 250 V AC and DC and indirect detection of AC zero line, phase line and breakpoints. It can also measure the on-off of uncharged conductors.
(3) direct detection.
① The last figure is the measured voltage value.
(2) When it is not up to 70% of the display value of the high break, it will display the low break value.
③ Measurement of direct current, you should touch the other pole.
(4) Indirect detection: hold down the B key, the pen near the power cord, if the power cord is charged, the digital pen display will show the high-voltage symbol on the display.
(5) Breakpoint detection: hold down the B key, move along the wire longitudinally, no display in the display window is the breakpoint.
