CN203825133U

CN203825133U - VGA cable testing instrument

Info

Publication number: CN203825133U
Application number: CN201320834711.XU
Authority: CN
Inventors: 王敏瑞
Original assignee: Shanghai Feixun Data Communication Technology Co Ltd
Current assignee: Shanghai Feixun Data Communication Technology Co Ltd
Priority date: 2013-12-17
Filing date: 2013-12-17
Publication date: 2014-09-10
Anticipated expiration: 2023-12-17

Abstract

The utility model provides a VGA cable testing instrument. The instrument comprises a signal transmitting device and a signal receiving device. The signal transmitting device comprises a transmitting assembly, a power supply, and a transmitting terminal VGA interface. The transmitting assembly is connected with the power supply and the transmitting terminal VGA interface. The signal receiving device comprises a detection assembly and a receiving terminal VGA interface. The detection assembly is connected with the receiving terminal VGA interface. When the instrument works, the signal transmitting device and the signal receiving device are connected in the two sides of a tested VGA cable. Whether the cable is conducted or not can be determined by the detection assembly on the signal receiving device. The VGA cable testing instrument is simple to operate, convenient to carry, and easy for troubleshooting of VGA cables under complex environments.

Description

A kind of VGA cable tester

Technical field

The utility model relates to a kind of cable detection technique, relates in particular to a kind of VGA cable tester.

Background technology

VGA, is the abbreviation of Video Graphics Array, and Video Graphics Array, is a kind of video transmission standard that IBM released with PS/2 machine in 1987.There is the advantages such as resolution is high, demonstration speed is fast, color is abundant, in simulating signal field of display, be widely used.

And VGA interface is the interface based on VGA, it is the interface type being most widely used on video card, and most video cards are all with this kind of interface.The 15pin connected mode that adopts asymmetric distribution, has 15 pins, is divided into 3 rows, 5 holes of every row.The displays image information that principle of work is computer-internal to be generated with digital form, is changed into R, G, B tricolor signal and row, field sync signal by the digital/analog converter in video card, signal by cable transmission in display device.

VGA cable is for connecting the special cables of the VGA interface of display terminal and the VGA interface of video card.At present, when whether test VGA cable normally works, conventional method is with multimeter, to judge that the quality of circuit, this method are only suitable for, in the very near situation of VGA two distance, cannot judging at a distance, uses inconvenient.Existing cable tester can only be tested netting twine and telephone wire, cannot test VGA cable.Once VGA cable breaks down, be difficult to effectively get rid of, increased cost.

Utility model content

For above-mentioned technical matters, the invention provides a kind of VGA cable tester of simple easy operating.

The utility model is achieved through the following technical solutions:

A VGA cable tester, comprises sender unit and signal receiving device, wherein:

Described sender unit comprises sending assembly, power supply and transmitting terminal VGA interface, and described sending assembly is connected with transmitting terminal VGA interface with described power supply respectively;

Described signal receiving device inclusion test assembly and receiving end VGA interface, described detection components is connected with described receiving end VGA interface.

As improvement of the present utility model, described sending assembly comprises signal generator, signal distributor, driver, and described signal generator connects described signal distributor, and described driver connects described signal distributor.

As improvement of the present utility model, described power supply is battery, and more preferably, described power supply can be Rechargeable battery.

As improvement of the present utility model, described output precision comprises a plurality of light emitting diodes, and more preferably, the number of described light emitting diode is 5.

As improvement of the present utility model, described signal distributor is pulsqe distributor.

As improvement of the present utility model, described signal generator is hex inverter.

As improvement of the present utility model, described driver is six bus drivers.

As improvement of the present utility model, described sender unit also comprises signal amplifier module, and described signal amplifier module connects described sending assembly.

As improvement of the present utility model, described sender unit also comprises display, and described display is connected with described sending assembly.

As improvement of the present utility model, described sender unit also comprises loudspeaker, and described loudspeaker is connected with described sending assembly.

As improvement of the present utility model, described sender unit also contains memory module, and described memory module connects described sending assembly.More preferably, described storage assembly is flash card.

The beneficial effects of the utility model are:

Easy to carry, be convenient to investigate VGA cable fault under complex environment;

Simple to operate, by detection components, can judge the connection of VGA cable.

Accompanying drawing explanation

The structured flowchart of Fig. 1 the utility model VGA cable tester one embodiment.

Fig. 2 is the circuit theory diagrams of the sending assembly of signal shown in Fig. 1.

Fig. 3 is the circuit theory diagrams of signal receiving assembly shown in Fig. 1.

Embodiment

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

As shown in Figure 1, the utility model provides a kind of VGA cable tester, comprises sender unit and signal receiving device.Fig. 2, Fig. 3 sending assembly shown in being and the circuit theory diagrams of receiving unit.

Sender unit comprises sending assembly, power supply VCC and transmitting terminal VGA interface U1, and sending assembly is connected with power supply, transmitting terminal VGA interface respectively; Sending assembly is by hex inverter CD4069, form as CD4017U2, the six bus driver 74LS367U3 of decade counter and pulsqe distributor.

CD4069 is hex inverter, comprises N1, N2, N3, N4, N5, six phase inverters of N6, is connected in the circuit in U2, U3.

U2 comprises pin Q0-9, CO, RST, CLK, CKINF, and wherein, pin Q1, Q3, Q5, Q7, Q9, CO, RST, CLK, CKINF are respectively 202 in Fig. 2,204,206,208,210,211,212,213,214.

In sending assembly, also comprise diode D1, D2, D3, D4, D5, D10, D1 connects U2, pin 7 connection U1 by pin 206 respectively; D2 connects U2, pin 1 connection U1 by pin 202 respectively; D3 connects U2, pin 13 connection U1 by pin 208 respectively; D4 connects U2, pin 3 connection U1 by pin 206 respectively; D5 is connected U2, through BNC and pin 8, is connected U1 by pin 210 respectively, and D10 connects U2 by pin 211.

U3 is connected to the positive pole of phase inverter N6 in CD4069 by pin 304,305, U1 is connected with transmitting terminal VGA interface, connects the pin 210 of U2 by pin 311,313, connects the pin 204 of U2 by pin 310,314.

Signal receiving device inclusion test assembly and receiving end VGA interface, detection components is connected with receiving end VGA interface.

Detection components in signal receiving device comprises light emitting diode D1 ', D2 ', D3 ', D4 ', D5 '.

During work, the pin 1(1 ' of VGA interface U1 and U1 '), 2(2 '), 3(3 '), 6(6 '), 7(7 '), 8(8 '), 13(13 '), 14(14 ') be connected respectively red primary line, green primary line, blue primary line, red ground wire, greenery patches line, blue ground wire, row line synchro, the field synchronization line of tested VGA cable.Because the pin of All other routes and correspondence is little to the normal work influence of VGA, in figure, do not represent.

Two phase inverter N1, the N2 of CD4069 and resistance R 1, R2 and capacitor C 1 form positive feedback network, form multivibrator, produce rectangular pulse signal.

Pulse signal is added to the CLK pin 211 of decade counter pulsqe distributor U2, when powering up, the RST pin 210 of CD4017 resets, CKINF pin 212 is connected to resistance to earth R3, pulse counting to input, and distribute to Q1 pin 202, Q3 pin 204, Q5 pin 206, Q7 pin 208, Q9 pin 210 and CO pin 211.

The pulse of Q1 pin 202 outputs is added to D2 positive pole, makes D2 conducting.The pulse signal of pin 202 is added to the input end of phase inverter N3 simultaneously, make its output terminal become low level, electric current is got back to sending assembly through the pin 2 of the pin 1 ' of the pin 1 of D2, transmitting terminal VGA interface, tested VGA line, receiving end VGA interface, D1 ', the pin 2 ' of receiving end VGA interface, tested VGA line, transmitting terminal VGA interface.If D1 ' lights, show pin 1(1 ') and pin 2(2 ') between VGA cable be communicated with.

As a same reason, the pulse of Q5 pin 206 outputs is added to the input end of the phase inverter N4 of D1 positive pole and CD4069, output terminal output low level is added to transmitting terminal VGA interface pin 6,7 and receiving end VGA interface pin 6 ', 7 ', to pin 6(6 '), 7(7 ') between VGA cable test.The pulse of Q7 pin 208 output is added to the input end of the anodal and phase inverter N5 of D3, completes pin 13(13 '), 14(14 ') between VGA cable test.

The pulse of Q3 pin 204 outputs is added to D4 positive pole, be added between the pin 314 and pin 310 of six bus driver U3 simultaneously, signal is exported high level through U3 from Q4 pin 205, through phase inverter N6 paraphase, make pin 8 become low level, electric current through pin 3, tested VGA cable, output to the signal receiving device of pin 3 ', through D3 ', pin 8 ', pin 3 to sending assembly, to pin 3(3 '), 8(8 ') between VGA cable test.

If VGA line connection error, the loop of flowing through changes, and light emitting diode illuminating state changes, and therefore can determine connection mode correctness.If test is bnc interface, the pulse of Q9 pin 210 outputs is added to pin 311 and the pin 312 of D5 positive pole and U3, and Q5 exports high level, is added to the other end of BNC through phase inverter N6 paraphase, and bnc interface is tested.4017 CO pin 211 can be exported equally pulse and be added to D10 through resistance R 4, power light flicker.

In receiving unit, D1 ' expression pin 1(1 '), the state of VGA cable 2(2 '), D2 ' expression pin 6(6 '), the state of VGA cable 7(7 '), D3 ' expression pin 3(3 '), VGA cable state 8(8 '), D4 ' represents pin 13(13 '), 14(14 ') between the state of VGA cable, D5 ' represents the state of BNC.When VGA line is normal, diode lights is bright; During open circuit, diode lights goes out, and according to lighting of different light emitting diodes, can determine VGA line connection state.

Above specific embodiment of the utility model be have been described in detail, but it is as example, the utility model is not restricted to specific embodiment described above.To those skilled in the art, any equivalent modifications that this practicality is carried out and alternative also all among category of the present utility model.Therefore,, not departing from the equalization conversion of doing under spirit and scope of the present utility model and revising, all should be encompassed in scope of the present utility model.

Claims

1. a VGA cable tester, it is characterized in that, comprise sender unit and signal receiving device, described sender unit comprises sending assembly, power supply and transmitting terminal VGA interface, described sending assembly connects respectively described power supply and described transmitting terminal VGA port;

Described signal receiving device inclusion test assembly and receiving end VGA interface, described detection components connects described receiving end VGA interface;

Described sending assembly output pulse signal; On the loop that described pulse signal forms at described transmitting terminal VGA interface, tested VGA cable and described receiving end VGA interface, transmit; Described detection components is arranged in described loop.

2. VGA cable tester according to claim 1, is characterized in that, described sending assembly comprises signal generator, signal distributor, driver, and described signal generator connects described signal distributor, and described driver connects described signal distributor.

3. VGA cable tester according to claim 1, is characterized in that, described signal distributor is pulsqe distributor.

4. VGA cable tester according to claim 1, is characterized in that, described detection components comprises a plurality of light emitting diodes.

5. VGA cable tester according to claim 4, is characterized in that, the number of described light emitting diode is 5.

6. VGA cable tester according to claim 1, is characterized in that, described power supply is Rechargeable battery.

7. VGA cable tester according to claim 1, is characterized in that, described sender unit also comprises memory module, and described memory module is connected with described sending assembly.

8. VGA cable tester according to claim 1, is characterized in that, described sender unit also comprises display, and described display is connected with described sending assembly.

9. VGA cable tester according to claim 1, is characterized in that, described signal generator is hex inverter.

10. VGA cable tester according to claim 2, is characterized in that, described driver is six bus drivers.