How to use the digital display test pen?
(1) Button description:
(A key) DIRECT, direct measurement button (far away from the LCD screen), that is, when using the pen tip to directly touch the line, please press this button.
(B key) INDUCTANCE, inductive measurement button (closer to the LCD screen), that is, when you touch the line with the tip of the pen, please press this button.
Note: Regardless of how to print on the electric pen, please remember that the one farther from the LCD screen is the direct measurement key; the one closer to the LCD is the sensor key.
(2) The digital display test pen is suitable for direct detection of 12-250 V AC and DC and indirect detection of neutral wire, phase wire and breakpoint of AC power. It can also measure the continuity of dead conductors.
(3) Direct detection:
①The last number is the measured voltage value.
②When the display value of high cut-off is less than 70%, it will display low cut-off value.
③ When measuring direct current, touch the other pole with your hand.
(4) Indirect detection: Press and hold the B key, and bring the pen tip close to the power line. If the power line is charged, the display of the digital display pen will display a 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.
An Alternative Method of Using the Measuring Pen
(1) It can be used for low-voltage phase verification to measure whether any wires in the line are in phase or out of phase. The specific method is: stand on an object insulated from the earth, hold a test lead in each hand, and then test on the two wires to be tested. If the two test leads glow brightly, the two lead wires are different. On the contrary, it is the same phase, which is judged by the principle that the voltage difference between the two poles of the neon bulb in the test pen is proportional to its luminous intensity.
(2) It can be used to distinguish alternating current and direct current. When testing with a test pen, if both poles in the neon bulb of the test pen glow, it is alternating current; if only one of the two poles glows, it is direct current.
(3) It can judge the positive and negative poles of direct current. Connect the test pen to the DC circuit for testing, the pole that glows on the neon bulb is the negative pole, and the pole that does not shine is the positive pole.
(4) It can be used to judge whether the DC is grounded. In the ground-insulated DC system, you can stand on the ground and touch the positive or negative pole of the DC system with the test pen. If the neon bulb of the test pen does not light up, there is no grounding phenomenon. If the neon bulb lights up, it means that there is a grounding phenomenon, and if it lights up like it is on the tip of the pen, it means that the positive electrode is grounded. If the light is on the finger end, it is the negative ground. However, it must be pointed out that in a DC system with a ground monitoring relay, this method cannot be used to determine whether the DC system is grounded.
