CN2704852Y - AC/DC appliances fault inspecting tool - Google Patents

Abstract

The utility model provides an AC/DC appliances fault inspecting tool, which is an improvement based on the existing test pencil. The middle of the inspecting tool is provided with a circuit board which is provided with two highly bright LEDs whose positive polar and negative polar are reversely connected in parallel, the top of the inspecting tool is provided with a feedback line. The positive pole and the negative pole are reversely connected in parallel and connected in series with a current-limiting resistor, a contact pin and a feeder line to achieve the purposes of inspect and separate the DC or AC return circuit and the polar. Under the situation of ensuring that the inspecting point is energized among the multiple AC/DC return circuits, the inspecting tool can inspect the AC/DC return circuits with a range of 10-380V; simultaneously, the inspecting tool has a three-display function, and therefore, the utility model can inspect accurately and quickly.

Description

Alternating current-direct current electrical equipment fault detect pen

Technical field:

The utility model relates to the Electric tester that a kind of instructed voltage exists, and whether especially a kind of measured point of discerning has electric alternating current-direct current electrical equipment fault detect pen.

Background technology:

The test pencil of social known use at present by: contact pilotage, insulation shell, current-limiting resistance, neon tube, spring, reflow metal touch panel etc. are formed, its course of work is a contact pilotage contact measured body, staff crimping reflow metal plate makes its measured point form the loop by contact pilotage → current-limiting resistance → neon tube → reflow metal touch panel → human body → the earth, neon tube starter when measured body is charged, on the contrary the measured point is not charged.But this test pencil is when the test ac circuit, because the same starter of test pencil did not easily cause erroneous judgement disconnected when the interference of induction field had electricity in the measured point, detecting pen because of needing human body, test pencil constitutes the loop again, so can't be judged to d-c component in to numerous equipment with alternating current-direct current control loop.

Summary of the invention:

The purpose of this utility model, provide a kind of the utilize unilateral conduction of luminescent crystal diode and being connected in series of current-limiting resistance and feeder line, difference by feeder line is connected to form the loop, to the each point detection of equipment AC-DC Circuit, reaches and confirms whether the measured point has the detecting pen of electricity.

The examination of this detecting pen electricity purpose is achieved in that the circuit board of packing at the middle part of this detecting pen, and two high brightness LED anode and cathode of establishing in the plate are opposite and connect, and draws the feedback streamline at the top of detecting pen.By the mutual reversal connection of the cathode and anode purpose that reaches detection through connecting, distinguishes alternating current-direct current loop and polarity in parallel with current-limiting resistance, contact pilotage, feeder line.

Owing to take such scheme, to confirming whether the measured point has that this can detect the alternating current-direct current loop in the 10 ∽ 380V scopes under the electric situation in numerous alternating current-direct currents loop, have three Presentation Functions simultaneously, promptly in DC loop, the feedback streamline of test pencil is connected with the loop negative terminal, contact pilotage touches the measured point, and there is electricity the bright expression of red light measured point and is positive potential.To present streamline and be connected contact pilotage with the loop anode and touch the measured point, green light is bright, and there is electricity the expression measured point and is negative potential.Feedback streamline with test pencil in ac circuit is connected with loop one end, and contact pilotage touches the measured point, and there is electricity traffic lights bright expression simultaneously measured point, otherwise does not have.Thereby reach the accurate detection effect.

Description of drawings:

Below in conjunction with drawings and Examples, the utility model device is further specified.

Fig. 1 is conventional cut-open view with test pencil.

Fig. 2 is the cut-open view of the utility model test pencil.

Fig. 3 is the electrical schematic of the utility model test pencil.

Shown in the figure, 1, contact pilotage 2, insulation shell 3, down guide metal 4, circuit board 5, go up guide metal 6, spring 7, metal contact pad 8, feedback streamline 9, crocodile clip.

Embodiment:

In Fig. 2, contact pilotage 1 one ends 1/5 insert in the insulation shell 2, be connected with following guide metal 3, current-limiting resistance and two light emitting diodes are welded on the circuit board 4, and circuit board one end is connected with following sheet metal, and the other end is connected with last sheet metal 5, last sheet metal connects spring 6, the spring other end connects metal contact pad 7, and metal contact pad top connects feedback streamline 8, and the feedback streamline is drawn it and do not held connection crocodile clip 9 from the test pencil top.

In Fig. 3, detect voltage range between 10 ∽ 380V for making, the resistance of current-limiting resistance R should be selected for use about 12K Ω.

Claims (1)

1, a kind of alternating current-direct current electrical equipment fault detect pen, comprise contact pilotage (1), insulation shell (2), starter element, current-limiting resistance, it is characterized in that: the middle part of the detecting pen circuit board (4) of packing into, two high brightness LED anode and cathode of establishing in the plate are opposite and connect, and draw feedback streamline (8) at the top of detecting pen.

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