How to measure voltage
A test pen used to determine whether a wire is live is a type of electrical and electronic instrument called a "digital display test pen." The body of the digital display pen features an LED display that makes it simple to view the test voltage figures. The resistance of the human body is often quite low, only a few hundred to several thousand ohms, and the resistance within the test pen is typically about several megohms when measuring the live wire, the lighting circuit, the voltage U=220V between the live wire and the ground. The current (i.e., the current flowing through the human body) is extremely low; it typically falls below 1 mA.People are not harmed when such a tiny current flows through their bodies, and light is produced when such a tiny current flows through the test pen's neon bulb.
Useful button usage instructions:
(A key) Please push this button while using the batch head to directly contact the line; DIRECT, the direct measurement key (away from the LCD panel;
(B key) Please press INDUCTANCE, the induction measurement button (nearer to the LCD screen), to use the batch head to detect the contact line.
Please take note that the sensor key is closest to the LCD screen and the direct measurement key is farther away, regardless of how the electric pen is printed.
This test pen can be used to directly detect voltages between 12-250 volts AC and DC as well as indirectly detect neutral, phase, and AC breakpoints. It can also gauge the continuity of wires that are not powered up.
Direct recognition
The measured voltage value is represented by the last number; the low-break value is shown when 70% of the high-break display value is not attained; when measuring direct current, touch the opposite pole with your palm;
Indirect detection:
Press and hold the B button and move the batch head close to the power cord. If the power cord is charged, the display of the digital display pen will display a high voltage symbol
Breakpoint detection:
Press and hold the B key and move longitudinally along the wire, the point where there is no display in the display window is the breakpoint.
The new digital display test pen can test 12V, 36V, 55V, 110V and 220V. Generally, the point on the top of the test pen is the voltage measurement, and the highest display is the current test voltage value; the bottom is the induction test to detect insulators In the case of circuit breakage, this is based on experience.
Voltage detection:
1. The detection range is AC/DC voltage of 12-250V.
2. Lightly touch the DIRECT button, and the metal front end of the test pen touches the object to be tested. The test pen has five voltage values: 12V, 36V, 55V, 110V and 220V. The last value on the LCD screen is the measured voltage value ( When it does not reach 70% of the high-end display value, the low-end value is displayed).
3. When measuring non-ground direct current, the hand should touch the other electrode (such as positive or negative).
Induction detection:
1. Touch the INDUCTANCE button, and the metal front end of the test pen is close to the object to be detected. If the "high voltage symbol" appears on the display, it means that the object is charged with alternating current.
2. When measuring the disconnected wire, touch the INDUCTANCE button, the metal front end of the test pen is close to the insulating outer layer of the wire, there is a disconnection phenomenon, and the "high voltage symbol" disappears at the breakpoint.
3. Use this function to easily distinguish between zero and phase lines (when measuring parallel lines, increase the distance between lines). Detect microwave radiation and leakage.
Precautions:
The keys do not need to be pressed hard, and the two test keys cannot be touched at the same time during the test, otherwise the sensitivity and test results will be affected.
