JPS58218664A - Cable conduction testing method - Google Patents

Abstract

PURPOSE:To detect easily and exactly the hit state of a cable, by inspecting the state of a cable to be tested, in each pulse current. CONSTITUTION:A pulse-like signal is supplied to a connector 2 of a cable to be tested 1 in accordance with each signal line 4-7, respectively, and an output signal from a connector 3 is supplied to EOR circuits 12-15 through invertors 16, 18, 20 and 22. At the same time, the pulse-like signal is applied to test lines 8-11 corresponding to each signal line, and is supplied to the circuits 12-15 through invertors 17, 19, 21 and 23. Accordingly, the hit can be detected by setting FFs 24-27 by a dissidence output of each input and output signal of the circuits 12-15, and displaying it by lamps 28-30.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a cable continuity test method that makes it possible to accurately detect the continuity of a cable used for receiving signals between devices or circuits. .

[Technology background]

Generally, cables (signal lines) must be completely conductive in order to reliably send and receive signals.

Naturally, for example, in a cable composed of a plurality of signal lines, if even one of the signal lines is not electrically conductive, the signal cannot be transmitted accurately.

For this reason, several cable continuity testing methods have been proposed.

[Conventional technology and problems]

Traditionally, the method of determining continuity of a cable is to apply DC voltage to the cable under test and see if current flows.
It was determined whether the cable under test was normal or not.

However, although this method can identify a complete break, it can also detect a half-break (conducting or non-conducting depending on the external force applied to the cable or how the cable is arranged).

) had the disadvantage that it was difficult to detect.

[Purpose of the invention]

The present invention provides a novel cable continuity testing method that eliminates the above-mentioned drawbacks.4! The purpose is to

[Structure of the invention]

In order to achieve the above object, the present invention provides a method of applying a predetermined electric current to one or more cables under test and conducting a continuity test of the cables, in which a pulse current is applied to the test cables.
Cable continuity is tested by inspecting the condition of the cable under test at each pulse current.

[Embodiments of the invention]

The present invention will be explained below with reference to the drawings.

The figure shows an embodiment of the cable continuity testing method of the present invention.

In the figure, 1 is the cable under test, 2.3 is the connector, and 4
．． 5.6.7 is a signal line, 8.9.10.11 is a test signal line, 12.13.14.15 is an exclusive OR circuit, 1
6.17.18.19.20.21.22.23 is an inverter, 24.25.26.27 is a flip-flop circuit, 28.29.30.31 is a buzzer or lamp, 32
．． 33, 34, and 35 indicate switches, respectively.

The cable to be tested now is shown in 1. In this embodiment, a continuity test is performed on signal lines 4.5.6.7. 2.3 is a connector, which is used, for example, by connecting certain devices with a connector 2.3.

In this embodiment, connector 2 is used as input, and connector 3tl
− Treated as output.

As shown in the figure, pulse signals are input to the connector 2 in correspondence with the signal lines 4, 5, 6, and 5, respectively.

The pulse-like signal thus input is transmitted to the signal line 4.
5.6.7i and is output from connector 3.

The output color code from this connector 3 is the inverter circuit 16
．． 18.20.22, the signals are inverted and input to one input terminal of the exclusive OR circuit 12.13.14.15.

On the other hand, the pulse-like signals input to each signal [4, 5, 6, and 7] are sent to test signal lines 8.91 and 10.11 provided corresponding to signal lines 4, 5, 6, and 7. At the same time, exclusive OR circuit 12 through all inverters 17, 19, 21, 23
,' l is input to the other input terminal of 3.14.15.

If pulsed signals are sequentially applied at a predetermined period with this configuration, an exclusive OR circuit 12.13.14.15
When a mismatch occurs between the input signal and the output signal, the output sets the state to the flip-flop circuits 24, 25, 26, and 27 corresponding to each signal line number 5, 6, and 7, The status of all lamps will be displayed on the 2nd, 29.30 and 31.

With this configuration, it is possible to easily detect a p-momentary interruption state.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to easily detect a momentary disconnection state of a cable, and the detection can be performed more accurately than in the past.

[Brief explanation of the drawing]

The figure shows an embodiment of the cable continuity testing method of the present invention. In the figure, 1 is the cable under test, 2.3 is the connector, and 4
．． 5.6.7 is a signal line, 8.9.10.11 is a test signal line, 12.13.14.15 is an exclusive OR circuit, 1
6.17.18.19.20.21.22.23 is an inverter, 24.25.26.27 is a flip-flop circuit, 28.29.30.31 is a buzzer or lamp, 32
．． 33, 34, and 36 indicate all switches, respectively.

Claims (1)

[Scope of Claims] 1) A method of conducting a continuity test of cables by passing a predetermined current through one or more cables under test, in which a pulse current is passed through the cables under test, and the test target at each of the pulse currents is A cable continuity test method that tests the continuity of a cable by inspecting the condition of the cable. 2] A patent claim in which the state of the cable under test at each of the above pulse currents is inspected by the exclusive OR output of the pulse current supplied to the cable under test and the pulse current flowing through the cable under test. Range of Cable continuity test method described in Paragraph 1.