Summary of the invention
The technical matters that the present invention will solve is, needs special circuit to the above-mentioned wireline test of prior art, implements more complicated, and defective such as testing efficiency is lower, and a kind of cable test device is provided.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of cable test device; Be used to test cable with many heart yearns; It comprises first test splice and second test splice that is connected to said cable two ends; Being used for that many heart yearns of said cable are connected into measurement circuit, thereby be used for being connected, to form test loop with the positive and negative interface of testing tool.
In cable test device of the present invention, said testing tool is multimeter or resistance meter.
In cable test device of the present invention, between two adjacent heart yearns, be serially connected with at least one resistance.
In cable test device of the present invention, in said measurement circuit, be respectively the parallel branch that the corresponding setting of every heart yearn has certain resistance, and the resistance of each parallel branch has nothing in common with each other.
In cable test device of the present invention, said cable has 9 heart yearns, and said first test splice and second test splice have 9 interfaces respectively, and each interface has external port and inner port respectively; Wherein, an inner port correspondence of first test splice the inner port and second test splice is connected the two ends of a heart yearn; The external port of the external port of first interface of said first test splice and the 9th interface of second test splice is respectively applied for the positive and negative interface of multimeter and is connected; The external port of the external port of second interface of said first test splice and the external port of the 3rd interface, the 4th interface and the external port of the 5th interface, the external port of the 6th interface and the external port of the 7th interface; And the external port of the external port of the 8th interface and the 9th interface is connected respectively; And with the external port of first interface of said second test splice and the external port of second interface, external port and the external port of the 4th interface, the external port of the 5th interface and the external port of the 6th interface of the 3rd interface; And the external port of the external port of the 7th interface and the 8th interface is connected respectively; Thereby form eight series arms, and at least one series arm series resistor.
In cable test device of the present invention,, the resistance of each series arm is all identical.
In cable test device of the present invention, the difference of the resistance between parallel branch and the series arm is at least 8800 ohm.
The cable test device of embodiment of the present invention has following beneficial effect: the inner port through using first test splice and second test splice is connected with each root heart yearn of cable, again with the adjacent external port of first test splice and second test splice; Series connection in twos, thus the heart yearn of cable is together in series, form measurement circuit; Again this measurement circuit is connected with multimeter at last, form test loop, thereby whether the heart yearn that can detect in this cable exists broken string; The present technique scheme adopts passive design, does not promptly need external power source, directly utilizes multimeter to detect; Testing efficiency is high, and the test duration is a second level; Further; When forming measurement circuit, promptly in cascade process, add resistance with preset value size; Thereby make the resistance of this measurement circuit is confirmed as a preset value; Therefore when cable is tested, compare with this preset value through the resistance value of read test, thereby can judge whether exist heart yearn to connect tin in this cable; Again further, in measurement circuit, be provided with the parallel branch of certain resistance for every heart yearn; And the resistance of each branch road is different; Therefore when carrying out cable detection,, can judge further that there is the broken string situation in which root heart yearn through the resistance of read test resistance; Again further; Through being provided with the resistance in parallel branch and the series arm to such an extent that differ bigger, thereby can prevent, promptly break and when connecting tin and taking place simultaneously in the multiple faults situation; The cable that failure cable is judged as; To sum up, the test event of cable test device of the present invention is very complete, can find any problem of cable processing.
Embodiment
Technical scheme of the present invention is to be used to test the cable with many heart yearns, and is as shown in Figure 1, in first embodiment of cable test device of the present invention; It comprises first test splice 21 and second test splice 22 that is connected to cable 1 two ends, and this first test splice 21 and second test splice 22 will be together in series each root heart yearn of cable 1 with after the two ends of cable 1 are connected; Constitute a measurement circuit, the measurement circuit that then will connect promptly forms test loop with after the positive and negative interface of testing tool is connected; Wherein, Multimeter will be set to the resistance measurement pattern, therefore, if there is certain reading in multimeter; Just can judge that this measurement circuit is communicated with this moment, and promptly all there is not the broken string situation in each root heart yearn of cable 1.When concrete design, this testing tool can be multimeter or resistance meter, but and the instrument of other test resistance, in technical scheme of the present invention, preferably use multimeter.
In actual use; The defective of cable 1 is generally broken string and connects two kinds of situation of tin, therefore connects the tin situation for whether the heart yearn in the ability detection streamer exists, when heart yearn is connected into measurement circuit; Through adding the resistance of preset value size; Promptly between two adjacent heart yearns, be serially connected with at least one this resistance, thus can the heart yearn of cable 1 be connected into have one confirm resistance measurement circuit, again this measurement circuit and multimeter are connected and composed test loop after; Through reading the measured value of multimeter to the resistance of this measurement circuit; And with it and should confirm that resistance compared, if this measured value is that the heart yearn in this cable does not promptly exist broken string not exist yet and connects tin when this confirms in the error range of resistance; If this measured value confirms that with this resistance differ bigger, then there is not broken string in the heart yearn of this cable, connects the tin situation between heart yearn but exist.
Two above-mentioned technical schemes can only judge that all there is broken string in cable; But broken string appears in which root heart yearn that can not point out with precision, therefore, and when there is broken string in the heart yearn in the cable 1; In order to judge that there is the broken string situation in which root heart yearn; The further technical scheme of the present invention: in measurement circuit, be respectively the parallel branch that the corresponding setting of every heart yearn has certain resistance, and the resistance of each parallel branch has nothing in common with each other.When using multimeter that cable 1 is detected; When if there is not broken string in the heart yearn in the cable; Electric current will flow through from heart yearn, and the every corresponding parallel branch of heart yearn flows through no current, therefore; The resistance size that the multimeter measurement is come out is the resistance of series arm, can show that at this moment cable 1 does not have broken string; And when certain root heart yearn broken string, electric current will flow through from the parallel branch of this heart yearn, adds the resistance of this parallel branch thereby the resistance value that multimeter is measured is the resistance of series arm, and therefore can judge is that which root heart yearn exists the broken string situation.In order to prevent that under the multiple faults situation failure cable erroneous judgement is good cable, promptly break and the situation that connects tin takes place simultaneously, it is bigger that the resistance that need parallel branch and the resistance of series arm are set to difference.
Among first embodiment as shown in Figure 1; This cable 1 has 9 heart yearns; First test splice 21 and second test splice 22 have 9 interfaces respectively, i.e. first interface, second interface, the 3rd interface, the 4th interface, the 5th interface, the 6th interface, the 7th interface, the 8th interface and the 9th interface; Each interface has external port and inner port respectively; Wherein, Inner port is used for being connected with heart yearn; In this embodiment; The inner port of first interface of the inner port of first interface of first test splice 21 and second test splice 22 is connected to the two ends of heart yearn 1; The inner port of second interface of the inner port of second interface of first test splice 21 and second test splice 22 is connected to the two ends of heart yearn 2; The inner port of the 3rd interface of the inner port of the 3rd interface of first test splice 21 and second test splice 22 is connected to the two ends of heart yearn 3; The inner port of the 4th interface of the inner port of the 4th interface of first test splice 21 and second test splice 22 is connected to the two ends of heart yearn 4; The inner port of the 5th interface of the inner port of the 5th interface of first test splice 21 and second test splice 22 is connected to the two ends of heart yearn 5; The inner port of the 6th interface of the inner port of the 6th interface of first test splice 21 and second test splice 22 is connected to the two ends of heart yearn 9, and the inner port of the 7th interface of the inner port of the 7th interface of first test splice 21 and second test splice 22 is connected to the two ends of heart yearn 7, and the inner port of the 8th interface of the inner port of the 8th interface of first test splice 21 and second test splice 22 is connected to the two ends of heart yearn 8; The inner port of the 9th interface of the inner port of the 9th interface of first test splice 21 and second test splice 22 is connected to the two ends of heart yearn 1; Then with the external port of second interface of first test splice 21 and the external port of the 3rd interface, external port and the external port of the 5th interface, the external port of the 6th interface and the external port of the 7th interface of the 4th interface, the external port of the external port of the 8th interface and the 9th interface is connected respectively, and in the process of two adjacent external port of series connection, adds the resistance that resistance equates; This in an embodiment, the resistance of this resistance is 1k ohm; In like manner; With the external port of first interface of second test splice 22 and the external port of second interface, external port and the external port of the 4th interface, the external port of the 5th interface and the external port of the 6th interface of the 3rd interface; The external port of the external port of the 7th interface and the 8th interface is connected respectively, and in the process of two adjacent external port of series connection, adds the resistance of 1k ohm; At this moment, can the heart yearn of cable 1 be together in series, and the resistance of the measurement circuit of this series connection is 8k ohm; And the external port of first interface of first test splice 21 will link to each other with the positive interface of multimeter; The external port of the 9th interface of second test splice 22 will link to each other with the negative interface of multimeter, and promptly electric current flows into from the external port of first interface of first test splice 21, and flow out from the external port of the 9th interface of second test splice 22; Measured value through the observation multimeter just can judge whether cable is correct; If promptly between 8.1K ohm, cable is qualified cable to the measured value of multimeter, otherwise is failure cable at 7.9K.Understandable, above-mentioned connected mode is a special case, as long as can realize these nine heart yearns are together in series, also can adopt other connected mode.
Among second embodiment as shown in Figure 2; For every heart yearn is provided with a parallelly connected branch road; And each parallel branch all is in series with the resistance that resistance has nothing in common with each other; Be that resistance R 1 to R9 is set to 10K ohm, 11K ohm, 12K ohm, 13K ohm, 14K ohm, 15K ohm, 16K ohm, 17K ohm and 18K ohm respectively, and 8 resistance R are set to 500 ohm, 600 ohm, 700 ohm, 800 ohm, 900 ohm, 1000 ohm, 1100 ohm and 1200 ohm respectively in the series arm.Therefore, under the single failure condition, if the result of test is bigger than the value of expectation; Explain that cable has the situation of broken string, and can judge that root line is disconnected, for example according to the resistance of test; If test result than expectation value big 11K ohm, the 8th heart yearn of tested cable broken string is described.If the result of test is littler than expectation value, the situation that connects tin is described, and can be according to the test value fault location.In this embodiment, be provided with the difference of the resistance between parallel branch and the series arm bigger, promptly be at least 8800 ohm.
The present invention describes through several specific embodiments, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to alternative the present invention.In addition, to particular condition or concrete condition, can make various modifications to the present invention, and not depart from the scope of the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole embodiments that fall in the claim scope of the present invention.