CN2143334Y

CN2143334Y - Multifunctional and high sensible voltage tester

Info

Publication number: CN2143334Y
Application number: CN 92233775
Authority: CN
Inventors: 李冠贺
Original assignee: Xiongyin Industry Co Puning County
Current assignee: Xiongyin Industry Co Puning County
Priority date: 1992-09-15
Filing date: 1992-09-15
Publication date: 1993-10-06
Anticipated expiration: 2002-09-15

Abstract

The utility model relates to a multifunctional and high sensitive power supply tester whose test circuit is a test amplifying circuit, wherein, the test amplifying circuit is composed of a Darlington tube which is formed by combining two crystal triodes, a current limiting resistor and a shunting resistor, has a first and a second hand contact electrodes, and takes an LED as a display device. The tester can test AC-DC voltage from 1.5 to 500V, and has the advantage of convenient, sensitive and reliable test with the function that the tester can detect phase wires, earth wires, zero wires of a power source, detect the positive electrode of a direct-current power source and detect whether a conducting wire is switched on or not and whether a condenser or a rectifying diode is in good condition or not.

Description

Multifunctional and high sensible voltage tester

The utility model relates to the electrical measurement that instructed voltage exists.

The general test pencil of forming by shell, test contact, hand touched electrode, current-limiting resistance and display device, whether the voltage that can only measure AC power usually exists, the voltage of surveying is higher could show.It is 90213802.2 multi-functional electricity measurer that China utility model patent communique has been announced application number, can measure combined-voltage, scope is 4～250V, can measure the DC circuit utmost point to, but the functions such as broken string circuit of calibration tape line skin, but also there is the insufficient sensitivity height in this electricity measurer, and structure is complicated, uses inadequately shortcoming easily.

The purpose of this utility model is to provide a kind of common test pencil appearance structure that has, single contact, multi-electrode, simple in structure, highly sensitive active test pencil, it is removed to make general test pencil usefulness, also can check electrical equipment and circuit whether to switch on, leak electricity, detect multiple test function such as whether intact capacitor and commutation diode.

The purpose of this utility model is achieved in that it is made up of plastics form of a stroke or a combination of strokes shell, test contact, light emitting diode, hand touched electrode and button cell, has in the test pencil by two transistor (BG ₁And BG ₂) Darlington transistor, the current-limiting resistance R that combine ₁, shunt resistance R ₂The amplification test circuit of forming, current-limiting resistance R ₁One terminate on the test contact, light emitting diode D is connected between the electrode of the collector of Darlington transistor and battery, draws first-hand touched electrode (T from the collector of Darlington transistor and the tie point of light emitting diode D ₁), draw second-hand's touched electrode (T from the tie point of light emitting diode and battery electrode ₂).

Profile of the present utility model is the form of a stroke or a combination of strokes of band metal penholder, the front end of test pencil is a test contact, and can above penholder, establish a metal and touch ring as second-hand's touched electrode with the metal penholder as first-hand touched electrode, light emitting diode is contained in the top of test pencil as display device.

When not doing test job, can avoid power consumption for making test pencil, to plug end as the metal pen of first-hand touched electrode directly is connected with light emitting diode D, the lower end of metal penholder then with test circuit in the collector of Darlington transistor press to touch with elasticity and be connected, promptly on penholder, open a window with respect to the position of penholder lower end, establish a conductive metal sheet in the window and link the collector of Darlington transistor in the test circuit, the lower end of penholder forms normal open by self elasticity and sheet metal in the penholder window and presses the property touched to be connected.When test pencil is not done test job, penholder hung insert, be inserted in pocket or other as extension and hang and insert on the thing, penholder promptly disengages with the collector of Darlington transistor, and makes the test circuit dump in the test pencil.

The utility model sensitivity is very high, can measure the combined-voltage scope and be (1.5～500V, not only can be by supply socket, also can measure power supply " live wire " across wire outer skin, when the test contact of test pencil is directly touched " the phase current potential " of power supply, as long as hand stylus bar, light emitting diode also can be shinny.

The utlity model has following multiple test function:

(1) judges that power supply it " live wire " reaches " ground wire " (or zero line).Method is: with test contact contact " live wire " or ground wire (or zero line), the hand stylus is inserted (being first-hand touched electrode), is " live wire " when light emitting diode is bright, is " ground wire " (or zero line) when light emitting diode does not work.

(2) positive pole of the direct supply of detection minus earth.Method is on the other hand by the ground end, on the other hand by first-hand touched electrode, when the position that the test contact of electrical measurement electroprobe is surveyed makes light emitting diode shinny, is the positive pole of direct supply.

(3) both positive and negative polarity of judgement battery.Method is on the other hand to touch second-hand's touched electrode, and arbitrary utmost point in another hand electric shock pond makes another utmost point in test contact electric shock pond, if when light emitting diode is bright, what test contact was touched is the positive pole of battery, and when diode did not work, what test contact was touched then was negative pole.

(4) whether conducting of check lead.Method is with on the other hand touching lead one end, and another hand touches second-hand's touched electrode of test pencil, and test contact is touched the other end of lead, if light emitting diode is shinny, and then lead conducting, if light emitting diode does not work, then lead is obstructed.

(5) quality of check capacitor (1000pf～10 μ f), method are on the other hand to touch second-hand's touched electrode, and another hand is pinned an end of capacitor, with the get an electric shock other end of container of test contact, if light emitting diode shinnyly promptly goes out, capacitor is normal for a moment; If light emitting diode does not work fully, capacitor does not go out if light emitting diode is long-time bright for opening circuit, and then capacitor seriously leaks electricity or punctured.

(6) quality of check commutation diode (or rectifier).Method is to touch second-hand's touched electrode on the other hand, another hand is pinned an end of commutation diode (or rectifier), test contact is touched the other end of commutation diode or rectifier, do not work as light emitting diode, again once, normal as the shinny then commutation diode of light emitting diode (or rectifier) with commutation diode (or rectifier) two ends negative testing.All do not work as positive and negative twice test light emitting diode, then commutation diode (or rectifier) opens circuit, and all bright as twice test light emitting diode, then commutation diode (or rectifier) punctures.

The utility model also has simple in structure, produces the advantage of installing easily.

Accompanying drawing 1 is the structural representation of utility model;

Accompanying drawing 2 be Fig. 1 the window's position AA to cut-open view;

Accompanying drawing 3 is a test circuit wiring diagram of the present utility model.

Below be described in detail CONSTRUCTED SPECIFICATION of the present utility model with reference to the accompanying drawings:

As shown in Figure 1, this test pencil is in the fore device test contact (1) of penholder body (2), the test circuit element is assemblied on the testing circuit board (4), the front end of circuit board links to each other with test contact (1) by metal spring leaf (3), a battery top board (7) is fixed in the rear end of circuit board, place two button cells (8) on the battery top board, battery (8) upper ends pressure spring (9), have the penholder head (12) that is threaded with penholder body on the top of penholder body (2), battery electrode conducting strip (10) is housed in the penholder head from bottom to top successively, as first-hand touched electrode (T ₁) metal penholder (6), light emitting diode conducting strip (11), as second-hand's touched electrode (T ₂) metal touch ring conducting strip (13), light emitting diode (D) (14), battery electrode conducting strip (10) touches ring conducting strip (13) with lead and metal and links to each other, link an end of light emitting diode again, the other end of light emitting diode is then linked light emitting diode conducting strip (11), when penholder head (12) and penholder body (2) when spinning, conducting strip (11) touches with penholder (6) pressure and links to each other.The relevant elements of this test pencil test circuit (as shown in Figure 3) is installed on the testing circuit board (4), test circuit comprises the Darlington transistor of being made up of two 9013 triodes, and connecting resistance value between base stage of Darlington transistor (B) and the emitter (E) is the shunt resistance R of 10M Ω ₂, current-limiting resistance R ₁By two resistance values all is the resistance R of 2M Ω ₁A and R ₁B is connected in series, and one of this current-limiting resistance terminates at the base stage (B) of Darlington transistor, and an end (A) is linked metal spring leaf (3) and then link test contact (1).Lower end part at the penholder body middle part corresponding to first-hand touched electrode metal penholder (6) has a window, be provided with conductive metal sheet (5) in the window, this sheet metal is fixed on the collector (C) that Darlington transistor was gone up and be connected to testing circuit board (4), and metal penholder (6) touches with conductive metal sheet (5) generation pressure by self elastic force and is connected (as shown in Figure 2).

Claims

1, a kind of active test pencil of being made up of plastic casing, test contact, light emitting diode, hand touched electrode and button cell is characterized in that having by triode BG ₁And BG ₂The Darlington transistor that combines, current-limiting resistance R ₁, shunt resistance R ₂The amplification test circuit of forming, one of current-limiting resistance terminates to test contact (1), and light emitting diode (D) is connected between the collector and battery electrode of Darlington transistor, draws first-hand touched electrode (T from the collector of Darlington transistor ₁), draw second-hand's touched electrode (T from light emitting diode and battery electrode tie point ₂).

2,, it is characterized in that touching ring as first-hand touched electrode (T with the metal above test pencil metal penholder and the penholder respectively by the described active test pencil of claim 1 ₁) and second-hand's touched electrode (T ₂), light emitting diode (D) is located at the top of test pencil.

3, by claim 1 or 2 described active test pencils, it is characterized in that as first-hand touched electrode (T ₁) metal pen plug end and be connected with light emitting diode D, the lower end of metal penholder is connected by the window on the penholder and a conductive metal sheet (5) the one-tenth normal open pressure property touched, conductive metal sheet (5) is connected to the collector (C) of Darlington transistor in the test circuit.

4, by the described active test pencil of claim 1, it is characterized in that current-limiting resistance R ₁Be 4M Ω, shunt resistance R ₂Be 10M Ω.

5, by claim 1 or 4 described active test pencils, it is characterized in that current-limiting resistance R ₁Can be by resistance R ₁A and R ₁B is in series, R ₁A and R ₁The resistance value of b is 2M Ω.