Electroprobe

Test pencil is also called the test pencil, hereinafter referred to as "pencil".Is a kind of electrical tools, used to test whether charged in the wire.When a neon bulb handwriting, the test if neon bulb glow, account wire conductor has electricity or for access.Test pencil, pen, pen, metal materials, pens at the insulation materials.When using test pencil, must use hand to touch the metal part of the end of a test pencil, otherwise, because of the charged body, test pencil, the human body with the earth did not form a loop, neon bulb does not shine in the test pencil, wrong result, don't think a charged body is charged.

According to the measured voltage high low score:

High voltage test pencil: for 10 kv and above project operations, to daily inspection of electrical appliance;

Low pressure test pencil: for line voltage 500 v and the following charged body detection project.

Elv test pencil: test for electronic products, general test voltage of 6 v, 24 v. In order to easy to use, electroprobe tail often lead wire with a belt clip.

According to the contact points:

Contact test pencil: by charged body contact, obtain the electrical signal detection tools.Shape usually have a screwdriver, and test pencil and a screwdriver;Pen type, directly on the LCD window shows the measurement data.

Induction test pencil: adopt induction test, no physical contact, can check line, conductor, and the socket voltage or along the conductor to check off position.Can maximum limit to the protection of the personal safety of inspection personnel.

Test pencil besides it can be judged whether objects charged, and the following purposes:

(1) can be used for low pressure nuclear phase, whether in phase or between any wires in the measuring circuit of interphase.Specific method is: standing on an object with the earth insulation, hands each hold a test pencil, and then in the two wires under test to test, if the two test pencil light is very bright, the two wire as heterogeneous;On the contrary, it is in phase, it is to use the test pencil in neon bulb with its luminescence intensity is proportional to the voltage difference between the poles of principle for judging.

(2) can be used to distinguish the alternating current and direct current (dc).In test pencil test, if test pencil neon bulb in both extremely light, is the alternating current (ac);If only one of the two extremely extremely light, is the direct current (dc).

(3) to determine the positive and negative direct current (dc).In dc test will test pencil, neon bulb shines the pole is negative, not is a very positive light.

(4) can be used to judge whether the dc grounding.In the land of the insulation of dc system, can stand on the ground with the positive or negative in the dc system, test pencil contact if test pencil neon bulb does not light, there is no grounding phenomenon.Grounding if neon bulb shines, explain a phenomenon that a shine as in the pen tip, show as the anode grounding.If shine through your fingers in the hand, for negative ground.But it must be noted that with the dc system grounding supervisory relays, do not use this method to determine whether a dc system grounding.

Test pencil is the electrician often use one of the tools, used to distinguish whether a charged object.Its internal structure is the only two electrodes of the light bulb, filled with neon inside the bubble, commonly known as neon bulb, it's a very received a tip, other series after a high resistance from the other end of the pen.When the voltage between the poles of neon bulb reaches a certain value, the poles between began to glow, glow intensity is proportional to the voltage between the poles.When charged body for the start of the voltage is greater than the neon bulb glow voltage, and coming into contact with it, test pencil pen tip at the other end are earth through the human body, so the testing pen.Test pencil in the role of the resistance is used to limit the current flows through the human body, lest produce risk.