The utility model belongs to the diesel locomotive control circuit and checks technical field, relates to specifically the circuit detector that checks the operation circuit wiring state.
The diesel locomotive control circuit is a kind of special circuit on the diesel locomotive, its purposes is the critical circuits of controlling combustion engine car operation, therefore whether whether correct combustion motor car running is normally very important to check control circuit, if control circuit goes wrong, might cause the accidents such as the diesel locomotive machine is broken, can cause when serious and burn the diesel locomotive machine, at present, multimeter is adopted in the control circuit inspection, but multimeter has following shortcoming; One, volume is large, carries inconvenience; Two, be to observe dial plate with eyes, can know just whether power supply is connected, if under the bad environment of locomotive glazed thread, can't observe dial plate, just need to increase light fixture.People's eyes should be observed dial plate when three, working, and also will observe test pencil, and migration is between the two, and efficient is low, use inconvenience, have certain danger.Four, the multimeter cost is high, in case the misoperation multimeter burns out easily, loses larger.
Summary of the invention
The purpose of this utility model is for above-mentioned deficiency, and a kind of volume that proposes is little lightweight, easy to carry, easy and simple to handle, reduces labour intensity and improves safety coefficient, the circuit detector that cost is low.
Technical solution of the present utility model is: circuit detector is comprised of one group of light emitting diode, hummer and another group light emitting diode series circuit, and another end of two groups of light emitting diodes connects probe by insurance respectively.
Two groups of light emitting diodes described in the technical solution of the present utility model connect by two light emitting diode reverse parallel connections and form.
Advantage of the present utility model is as follows: (1) the utility model does not need external power supply, directly uses the power supply in the circuit-under-test.(2) adopt acoustic-optic alarm, circuit theory is simple and practical, by rational design, realizes the whether intact function of testing circuit.(3) structure interchangeability is good, and two probe structures are identical, at any time Alternate.(4) easy to use.(5) lightweight easy to carry, safe and reliable.
Description of drawings
Fig. 1 is electrical schematic diagram of the present utility model.
As shown in Figure 1, circuit detector of the present utility model comprises two groups of light emitting diodes 7,10 and two hummers 8,9, one group of light emitting diode 7 and two hummers 8,9 and another group light emitting diode 10 coupled in series successively, two groups of light emitting diodes 7,10 the other end connect probe 4,3 by insuring 5,6 respectively, two groups of light emitting diodes 7,10 form by two light emitting diode reverse parallel connections, and namely the positive pole of two light emitting diodes is connected with negative pole.Principle of work: with negative terminals 1 overlap joint or the earth terminal of probe 3 with circuit under test, check the connection terminal 2 of required inspection with another probe thorn, if light emitting diode 7,10 luminous, and hummer 8,9 sounds a buzzer, then this terminal plugged.During use, the operator does not need deliberately to observe luminous situation, can hear buzzer simultaneously.