Low voltage field test pencil

Abstract

The invention discloses a low voltage field test pencil. A test contact, a current limiting resistor, a neon tube and a hand touch electrode are connected in series. The test contact is connected with one end of a shunt resistor. The other end of the shunt resistor is connected with an identification electrode. The resistance of the shunt resistor is not less than the resistance of the current limiting resistor. The test contact extends into a cavity of an insulating casing from one end of the insulating casing to contact a spring I. The other end of the spring I contacts a concentric resistor. The longitudinal section of the concentric resistor is E-shaped. The current limiting resistor of the middle cylindrical part is higher than a pipe part as the shunt resistor. One end of the neon tube contacts the current limiting resistor without touching the shunt resistor. One end of a spring II contacts the neon tube. The other end contacts the hand touch electrode on a back cover. According to the invention, the low voltage field test pencil can test whether a tested object is electrified; safe and dangerous voltage are easily distinguished; the resistors are used in a shunt branch; and the structure is simple.

Description

technical field [0001] The invention relates to an electric test device for indicating whether there is voltage in a conductor, which is used in a low-voltage work site, and can identify whether the conductor is safe or not, and is an electric test pen for checking the existence of dangerous voltage. Background technique [0002] At present, the known structure of the electric test pen is composed of a test contact, a current limiting resistor, a neon tube, a metal spring and a hand electrode connected in series. Put the test contact in contact with the object under test, and touch the hand electrode with human hands. When the object under test has a higher voltage than the ground, the neon tube will light up, indicating that the object under test is charged. However, the metal shells of many electrical appliances do not have dangerous electric shock voltages to the human body, but only indicate that the distributed capacitance and / or normal resistance induces a potential to...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiency that the existing electric test pen cannot distinguish between dangerous electric shock voltage and non-dangerous induced potential, the present invention is a new innovative electric test pen, which can not only detect whether the object under test is electrified, but also conveniently Differentiate between dangerous electric shock voltage and non-hazardous induced potential

Images