CN2078886U

CN2078886U - Range-adjustable induction electric properties tester

Info

Publication number: CN2078886U
Application number: CN 90220077
Authority: CN
Inventors: 陈为凡
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-09-08
Filing date: 1990-09-08
Publication date: 1991-06-12

Abstract

The utility model relates to a measurement range adjustable inductive electricity measurer, which is composed of a junction N channel field effect transistor BG1, resistors R1, R2 and R3, a luminous diode LED, a triode BG2, a switch K, a battery E and a potentiometer W. According to different situations, the utility model can adjust the sensitivity so as to detect the electric failures of multi-strand twist row lines and multi-strand parallel lines, and the utility model overcomes the defects of the prior art. The utility model has the advantages of high search speed, accurate judgement, small volume, low cost, convenient operation and maintenance.

Description

The induction electricity measurer of adjustable range finding

The utility model relates to the existence of a kind of indicator current or voltage, and then measures the utensil of location of fault.

In the existing technology in above-mentioned field, main survey instrument is electroprobe, multimeter, Northern Europe table, pincerlike meter etc., when whether these instruments and instrument have electricity in measurement, without exception must be the energising and expose charged point in just can measure, lead is taken place hidden danger faults such as interruption, the difficulty of its measurement well imagines that these are measured also and must carry out careless slightly easy generation security incident on exposed charged point in addition.For addressing the above problem, more contactless (induction type) electricity measurer has appearred in recent years, wherein a class is representative with CN2039024U disclosed " insulated type electronics electroprobe ", it is by field effect transistor 3DJ, portable shielding cover, resistance R, triode 3DG, LED, pushbutton switch AN, battery E and garden pearl pen core are formed, and it can make differentiation to phase line and zero line outside insulation course; Also can do apart from sensing, whether charged, help concealed wire and search if promptly measuring conductor in 20 centimetres, also can make the high pressure sensing, and promptly can sense the 10KV hi-line in 1.5m has not charged ...Though this technical scheme has been done useful improvement to the electricity measurer tool, but it is designed to fixed resistance value with resistance R, cause the sensitivity of test pencil to adjust, can not accurately measure the existence of curtage of multiply strand line and multiply parallel line and the definite position of definite fault, this technical scheme structurally is designed to combine with garden pearl pen, increase bell housing, strengthened the unnecessary cost of this product.In addition, this scheme is not considered transistorized discreteness, and the resistance of transistor duty and parameter is adjusted in design between the node of the positive pole of light emitting diode and button AN and resistance R, and this test pencil is made troubles in maintenance and user's use.

The purpose of this utility model provides a kind of induction electricity measurer of adjustable range finding, it is adjustable with the sensitivity design of surveying electrical property in the prior art, reduced the bell housing of prior art, add the adjustment resistance of transistor duty and parameter, reduced the trouble in maintenance and the use.Structure of the present utility model, structure or its are in conjunction with having proposed a kind of practical, new technical scheme that is suitable for.

The concrete structure of realizing the utility model above-mentioned purpose comprises: junction type N channel field-effect pipe BG1, resistance R 1, R2 and R3, LED, triode BG2, K switch, battery E and potentiometer W.It is compared with above-mentioned prior art, outstanding difference is: be connected to the duty of adjustment triode BG2 and the resistance R 3 of parameter between an end of the positive pole of LED and K switch, be connected to resistance R 2 between the source electrode of the base stage of triode BG2 and field effect transistor BG1, between the node of the source electrode of the node of resistance R 3 and K switch and field effect transistor BG1 and resistance R 2, be connected to the series circuit of resistance R 1 and potentiometer W.Accompanying drawing 1 is a circuit structure diagram of the present utility model, and it also constitutes a complete embodiment of the present utility model.Below in conjunction with drawings and Examples in detail this utility model is described in detail.The adjustable range finding induction electricity measurer that the utility model is pointed is sensed measured signal with the grid of junction type N channel field-effect pipe 3DJ6 from space electric field (electric field around the lead), amplifies through one-level triode 3DG201, shows by LED.R is the pull-up resistor of field effect transistor, and resistance can suitably be adjusted according to the pipe electric current, and the voltage between source electrode and drain electrode should just end 3DG201 a little less than 0.7V when non-inductive signal.R selects the series connection of 2.7K and 22K potentiometer for use, this resistance substantially in setting range, other element such as before chat, this does not give unnecessary details, resistance R 3 is 20～24 Ω, R2 is 1K.

Design of the present utility model, making and use prove, it has realized the purpose of its innovation and creation satisfactorily, has overcome many deficiencies of prior art effectively, according to different situations, adjustment sensitivity has shown the speciality that it is original with the electric fault aspect of accurate mensuration multiply strand line and multiply parallel line, retrieving speed is rapider, and it is more accurate to judge, volume is littler, cost reduces, and keeps in repair and uses more convenient.

Claims

1, the induction electricity measurer of adjustable range finding, form by junction type N channel field-effect pipe BG1, resistance R, LED, triode BG2, K switch and battery E, it is characterized in that: be connected between an end of the positive pole of LED and K switch between the source electrode of the base stage of resistance R 3, triode BG2 of the duty of adjusting triode BG2 and parameter and field effect transistor BG1 and be connected to resistance R 2, between the node of the source electrode of the node of resistance R 3 and K switch and field effect transistor BG1 and resistance R 2, be connected to the series circuit of resistance R 1 and potentiometer W.

2, the induction electricity measurer of adjustable range finding according to claim 1, it is characterized in that: field effect transistor BG1 is 3DJ6, triode BG2 is 3DG201, the resistance of resistance R 1, R2 and R3 is respectively 2.7K 1K and 20～24 Ω, potentiometer is 22K, voltage between BG1 source electrode and drain electrode should make 3DG201 just by being advisable a little less than 0.7V when non-inductive signal.