Do you know these uses of electric measuring pens?
1. It can perform low-voltage phase verification to measure whether the wires in the line are the same or different.
We can do the following operations: stand on an object insulated from the earth, hold a test pencil in each hand, and then test the two wires to be tested. If both pens glow, then the two wires are Out of phase, otherwise it is in phase.
2. It can judge AC and DC. When we test with an electrometer pen, if we find that both poles in the neon bulb of the electroscope glow, this is alternating current, and if only one pole glows, then it is direct current.
3. Distinguish the positive and negative poles of direct current. Connect the electroscope to the DC circuit, the pole that glows from the neon bulb is the negative pole, and the pole that does not shine is the positive pole.
4. It can judge whether the DC is grounded or not. In a ground-insulated DC system, you can stand on the ground and touch the positive or negative pole of the DC system with a test pencil. If the neon bulb of the test pen is not bright, 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 at the tip of the pen, it means that the terminal is grounded. , if it lights up at the finger end, it is the negative ground. , but it must be pointed out that in a DC system with a ground monitoring relay, this method cannot be used to judge whether the DC system is grounded or not.
5 According to the nature of the baked goods, strictly control the baking time. Prevent burning caused by baking for too long. When heating with infrared rays, the distance should be appropriate.
6 When using microwave ovens or induction cookers, prevent the Ir insulation from aging or the coils from being damp, so as not to cause short circuits. Electric sparks are generated to ignite combustibles.
7 The electric heater adopts a special socket, and installs and properly uses a thermostat according to the need, and strictly controls the temperature rise condition. Once an abnormal temperature rise is found, the power supply is quickly cut off.
