How to use the digital display test pen and the method of detecting the short circuit of the wire
How to use one, digital display electric pen:
1. Button description: (A key) DIRECT, direct measurement button (far away from the LCD screen), that is, when using a batch head to directly touch the line, please press this button; (B key) INDUCTANCE, induction measurement button (far away from the LCD screen) close to the screen), that is, when using the bit sensor to contact the line, please press this button. Note: Regardless of how to print on the electric pen, please recognize that the one farther from the LCD screen is the direct measurement key; the one closer to the LCD is the sensor key!
2. This electric test pen is suitable for direct detection of 12-250v AC and DC and indirect detection of neutral line, phase line and breakpoint of alternating current. It can also measure the continuity of dead conductors.
3. Direct detection
a. The last number is the measured voltage value;
b. When the high-cut display value is less than 70%, the low-cut value is displayed;
c. When measuring direct current, touch the other pole with your hand;
4. Indirect detection: press and hold the B key, put the batch head close to the power cord, if the power cord is charged, the display of the digital display pen will display the high voltage symbol
5. Breakpoint detection: hold down the B key and move longitudinally along the wire, the place where there is no display in the display window is the breakpoint;
Two, directly detect whether the wire is short-circuited
There is a button for breakpoint measurement. For a wire, you can hold this end of the wire with one hand, and touch the hotkey of breakpoint measurement with your finger on the other hand, and touch the other end of the wire with the tip of the electric pen. If the red light of the electric pen is on, it means that the wire is connected, and if it is not on, it means that it is disconnected. Measure power if there are no breakpoints. It is impossible to judge the continuity of the wire with the electric pen.
Three, voltage display: the above display: 12 24 36 110 220v. If you put it on the fire wire, it will display 220, and if it is neutral wire, it will generally display 16 or 24v!
After four, the neutral line is broken, when the neutral line of the power supply (the front end of the breakpoint) is measured with an electric pen, the neon bulb does not light up, and the digital display pen displays the symbol of electricity. When the electric pen is used to measure the back end of the breakpoint, the neon bulb glows normally. The digital display pen shows 220 volts.
Five, two-core wire short-circuit search: plug in the power supply, use the digital display electric pen to indirect measurement search, if you can’t find out, it may be that the breakpoint is on the neutral line, reverse the plug to make the neutral and live wires reversed and then measure.
six, the test pen generally displays 12V24V48V110V220V380V, but the actual reading depends on the maximum value of the digital display meter, that is, the maximum value of the displayed data. For example, if it displays 12V, 36V, the approximate value of the measured voltage is 36V; Voltage, that is, single-phase voltage, the rated value is 220V, the voltage of the neutral line; generally known as the voltage of the neutral line, it is 0V when balanced; the ground line, as the name implies, is directly grounded, 0V; the data in the final actual measurement It shows that the live wire is generally between 210-230, the neutral wire is generally within 0-24V because it is generally unbalanced load, and the ground wire must be 0V, otherwise it will definitely get an electric shock (usually connected to the shell, and called the protection line).
