CN203054094U

CN203054094U - Cable tester

Info

Publication number: CN203054094U
Application number: CN 201320015776
Authority: CN
Inventors: 李涛; 戴革林; 袁晓梅; 张宁; 荣鹏辉; 王贞圭; 张晴
Original assignee: 李涛
Priority date: 2013-01-09
Filing date: 2013-01-09
Publication date: 2013-07-10
Anticipated expiration: 2023-01-09

Abstract

The utility model discloses a cable tester, comprising a power supply circuit module, an insulation test circuit module, an A/D acquisition module, a conduction measurement circuit module, a man-machine interface module, a CPU master controller, and a digital display module. The cable tester provided by the utility model is capable of conducting automatic tests on cable conduction situations and cable insulation resistance values and automatically switching among and testing on all cores of a cable; the cable tester is high in working efficiency and simultaneously has a function for setting a core number of the cores of the cable to be tested; and the cable tester is capable of testing multi-core cables and has a stronger adaptability.

Description

Cable tester

Technical field

The utility model relates to a kind of cable tester, particularly relates to the device of a kind of test cable conducting resistance automatically and insulation resistance.

Background technology

At present, traditional cable test instrument, all be manually every heart yearn of cable to be tested, need in use manually every cable to be carried out test cable conducting situation and insulating resistance value, detection sequence requirement height for every cable, testing process generation test leakage or duplicate test after need all to detect again inefficiency one time; In addition, the existing cable tester is merely able to detect 12 core cables at most, and along with the development of technology, novel equipment becomes increasingly complex, and the cable core number also can reach 24 cores at most, can not satisfy new equipment and detect needs.

Summary of the invention

The purpose of this utility model provides a kind of cable tester, can carry out automatic test, every heart yearn of automatic switchover detection streamer of cable conducting situation and insulating resistance of cable value, high efficiency, has the function of setting cable core core number to be checked simultaneously, can test polycore cable, adaptability is stronger.

For achieving the above object, the technical solution adopted in the utility model is:

A kind of cable tester comprises power circuit module, Insulation test circuit module, A/D acquisition module, conducting metering circuit module, human-machine interface module, CPU primary controller and digital display module; Wherein, described CPU primary controller is connected with described human-machine interface module, realizes carrying out the man-machine interface command interaction; Described CPU primary controller is connected with described digital display module, realizes the demonstration of test result; Described A/D acquisition module comprises A/D Acquisition Circuit and channel switching circuit, the A/D acquisition module is connected with the Insulation test circuit module with conducting metering circuit module respectively, realizes the analog to digital conversion of passage switching, the program control amplification of signal and the signal of measured signal conducting or Insulation test; Described conducting metering circuit module is used for realizing the continuity test of tested cable, and the constant current source that continuity test is required or measuring resistance switch in the corresponding metering circuit by channel switching circuit; Described Insulation test circuit module is used for realizing the Insulation test of tested cable, and the constant pressure source that Insulation test is required switches in the corresponding metering circuit by channel switching circuit; Described A/D acquisition module is connected with the power circuit module simultaneously, and the power circuit module is made up of power module and support circuit.

Cable tester with prior art is compared, power circuit module, Insulation test circuit module, A/D acquisition module, conducting metering circuit module, human-machine interface module, CPU primary controller and the digital display module of cable tester of the present utility model by arranging, can carry out automatic test, every heart yearn of automatic switchover detection streamer of cable conducting situation and insulating resistance of cable value, high efficiency, has the function of setting cable core core number to be checked simultaneously, can test polycore cable, adaptability is stronger.

Description of drawings

Fig. 1 is the utility model structured flowchart;

Fig. 2 is that conducting metering circuit module of the present utility model connects block diagram;

Fig. 3 is that Insulation test circuit module of the present utility model connects block diagram;

Fig. 4 is testing process block diagram of the present utility model.

Embodiment

Below in conjunction with drawings and Examples the utility model is described.

As shown in Figure 1, a kind of cable tester comprises power circuit module, Insulation test circuit module, A/D acquisition module, conducting metering circuit module, human-machine interface module, CPU primary controller and digital display module; Wherein, described CPU primary controller is connected with described human-machine interface module and realizes carrying out the man-machine interface command interaction; Described CPU primary controller is connected the demonstration that realizes test result with described digital display module; Described A/D acquisition module comprises A/D Acquisition Circuit and channel switching circuit, the A/D acquisition module is connected with the Insulation test circuit module with conducting metering circuit module respectively, realizes the analog to digital conversion of passage switching, the program control amplification of signal and the signal of measured signal conducting or Insulation test; Described conducting metering circuit module is used for realizing the continuity test of tested cable, and the constant current source that continuity test is required or measuring resistance switch in the corresponding metering circuit by channel switching circuit; Described Insulation test circuit module is used for realizing the Insulation test of tested cable, and the constant pressure source that Insulation test is required switches in the corresponding metering circuit by channel switching circuit; Described A/D acquisition module is connected with the power circuit module simultaneously, and the power circuit module is made up of power module and support circuit.

Realize portable purpose, described power module adopts the dual mode power supply, and available 220V alternating current also can be powered with the battery pack that tester carries.

Described digital display module mainly is made up of the LCD LCDs, realizes the demonstration of start-up picture, self-detection result, conducting resistance resistance and insulation resistance resistance information.

As shown in Figure 2, conducting metering circuit module of the present utility model is used for realizing the continuity test of tested cable, and constant current source or measuring resistance that continuity test is required switch in the corresponding metering circuit by channel switching circuit.Described conducting metering circuit module is provided with high-pressure modular, high-pressure modular is connected with reference voltage source, reference voltage source is connected with channel switching circuit with monolithic a/d converter respectively, and test point is connected with channel switching circuit by relay, and tested cable is connected with measuring resistance.Conducting resistance is measured and is adopted the rule of three measuring principle.Rule of three has simple, the accuracy advantages of higher of circuit, can give full play to the good characteristic of monolithic a/d converter itself, realizes that Ω/U changes.Even there is deviation in reference voltage or fluctuates, can not increase measuring error.

As shown in Figure 3, Insulation test circuit module of the present utility model is used for realizing the Insulation test of tested cable, power module is connected with standard restrictor, divider resistance and measured resistance simultaneously, for it provides required supply voltage, relay is connected with divider resistance, divider resistance is connected with the standard restrictor, insulation resistance to be measured is connected with standard restrictor, divider resistance simultaneously, leakage current method measuring principle is adopted in insulation measurement, measures the insulation resistance of parasitic loop by the applying direct current potential source.If a certain heart yearn in tested loop and other heart yearn, cable housing, insulate, apply DC voltage for this heart yearn, then all the other heart yearns just do not have leakage current over the ground, otherwise, will detect electrical leakage voltage.

As shown in Figure 4, the utility model test job principle and process are: press " self check " button after connecting the power supply start, after finishing self check, carry out parameter the ultimate value of test cable core number, conducting resistance and insulation resistance is set, the conducting metering circuit of triggering portable cable tester and insulation measurement circuit etc. are finished the test of cable, and have display circuit mainly to be shown test results by the LCD LCDs.Thereby finish the automatic test of cable.

Cable tester of the present utility model can be realized following function: (1) judges the cable break-make, measures the function of cable conducting resistance and insulation resistance; (2) start self-diagnostic function; (3) the real-time Presentation Function of test result; (4) automatic switching function of cable core, after detection starts, the automatic the judgement whether conducting resistance of every heart yearn of automatic switchover detection streamer and the insulation resistance between each heart yearn and each resistance meet the demands; (5) function of setting cable core core number to be checked; (6) conducting resistance and the insulation resistance value set-up function that transfinites can be used for conducting resistance and the whether qualified judgement of insulation resistance value of different brackets.

Claims

1. a cable tester is characterized in that: comprise power circuit module, Insulation test circuit module, A/D acquisition module, conducting metering circuit module, human-machine interface module, CPU primary controller and digital display module;

Wherein, described CPU primary controller is connected with described human-machine interface module, realizes carrying out the man-machine interface command interaction; Described CPU primary controller is connected with described digital display module, realizes the demonstration of test result; Described A/D acquisition module comprises A/D Acquisition Circuit and channel switching circuit, the A/D acquisition module is connected with the Insulation test circuit module with conducting metering circuit module respectively, realizes the analog to digital conversion of passage switching, the program control amplification of signal and the signal of measured signal conducting or Insulation test; Described conducting metering circuit module is used for realizing the continuity test of tested cable, and the constant current source that continuity test is required or measuring resistance switch in the corresponding metering circuit by channel switching circuit; Described Insulation test circuit module is used for realizing the Insulation test of tested cable, and the constant pressure source that Insulation test is required switches in the corresponding metering circuit by channel switching circuit; Described A/D acquisition module is connected with the power circuit module simultaneously, and the power circuit module is made up of power module and support circuit.

2. according to the described cable tester of claim 1, it is characterized in that: described power module is the battery pack that 220V alternating current or tester carry.

3. according to the described cable tester of claim 1, it is characterized in that: described digital display module mainly is made up of the LCD LCDs, realizes the demonstration of start-up picture, self-detection result, conducting resistance resistance and insulation resistance resistance information.