JPS5832174A - Wiring tester - Google Patents

Abstract

PURPOSE:To discriminate whether wiring circuits to be tested are short circuited, half short circuited, disconnected, normal or not easily and quickly by changing over said circuits successively to respective discriminating circuits by means of a timing circuit. CONSTITUTION:Wiring circuits 9 to be tested are connected to a short circuit detecting circuit 5 by changing over the switch in a change-over circuit 7 to a terminal SW1 in accordance with the instruction from a timing circuit 8, whereby the short circuiting of the wiring circuits is detected. If any of the circuits 9 is short circuited, the circuit 8 instructs the switch 7 to stop advancing to the next step in accordance with the instruction from a decoder 6 and outputs that the wiring is short circuited. On the other hand, if the wiring are not short circuited, the switch SW of the circuit 7 is changed over to a terminal SW2 by the timing of the circuit 8 and the state of half short circuiting is discriminated. Thereafter, the switch is changed over to SW3 and a disconnection state is discriminated similarly. If no abnormality is detected in all the tests, it is displayed that the wirings are normal. With such method, there is no need for providing testers to each of test items, and the wiring states are discriminated easily and quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiring tester, and in particular, it is possible to identify faults in the wiring by using a single wiring tester to determine whether there is a short circuit, half-short circuit, disconnection, or normal wiring.

Conventionally, as a method for identifying the wiring condition, the wiring condition is predicted in advance using a circuit tester or the like, and the wiring condition is to be identified, such as a short circuit or a semi-short circuit.

Each item requires a tester suitable for each item, such as wire breakage, etc., and it takes time to select a tester for each test item, and to prepare and operate the test in accordance with the test method and procedure of the tester. It wasn't efficient.

In order to eliminate the drawbacks of the conventional tester, the present invention provides a wiring tester with a simple test method and test procedure, in order to sequentially identify the wiring status, that is, short circuit, manual short circuit, disconnection, and whether normal wiring is possible or not, using a single tester. It provides: That is, the present invention provides an identification circuit including a first setter, an eleventh first comparator, and a short-circuit detection circuit for identifying a short circuit; A datar for identifying self-normal wiring, short circuit, half-short circuit, and disconnection based on the identification result of the short-circuit condition, and a tying circuit for sequentially switching the wiring path under test to the sorting circuit according to the timing. It consists of a switching circuit, and the wiring path to be tested is sequentially switched to each input terminal of a short circuit, semi-short circuit, or disconnection of the identification circuit according to the timing to identify the wiring state.

Next, the embodiment 1 of the present invention will be explained with reference to the drawings.

Figure 811 is a circuit configuration diagram of an implementation column of the present invention, in which the wiring path t to be tested is connected to the switching circuit, and further from the switching circuit to the cassette I, the second comparators J, -, and the short circuit detection circuit j. wired. On the other hand, the first and second comparators J and D are respectively connected to a first setting device l which provides a reference for determining whether or not there is a disconnection, and a first setting device 1 which provides a reference for a short circuit. ing. In addition, in order to sequentially switch the wiring path under test to the comparators J and - and the short-circuit detection circuit 5, the tie ζ puffer circuit l and the switching circuit are connected, and the wiring pattern ll of the wiring path t to be tested is identified and saved in sequence according to the timing. It is configured as follows. Note that the switch 8 in FIG. 1 is a switch that is selected in accordance with each of a large number of wiring paths t to be tested.

In addition, if we further explain the details of the short circuit detection circuit S using diagram @X, in Figure 2, ja is the signal input terminal, jb is the ground terminal,
rl, r! * ram r4 * rl-rl1 Fi low resistance SC diode, jh is not circuit, DiIfi
The diode, SCRki thyristor, and Tr are transistors, jd, je, jf, and 3g. Each terminal is connected to the corresponding terminal in the middle of the Fi circuit. Now, when the load (the wiring path under test in the present invention) L is short-circuited, when the input terminal jaK input signal becomes 6ov (Low level), the diode SC turns on and the 14th element 5d becomes LOW. The terminal je is about to go to the HIGH level, and the transistor Tr is turned on, so a large current flows through the resistors r and K, and the voltage across the resistors r and t turns on the thyristor 8CRt through the resistors r and t.

Therefore, the terminal je is suppressed to LOW level, and the transistor Tr is turned off, and the terminal jg #1) becomes the IGH level.Also, if a normal load is connected to the terminal jg, the transistor TrKFi is only turned on. The transistor Tr remains on while the input signal is input without a large current flowing, and the terminal sg
is maintained at a LOW level.

In other words, after a short period of time has passed since the input of the human power signal, the state of terminal jg is LOW when the load is normal, and HI when there is a short circuit.
It becomes GH level and short circuit detection can be performed. Now, according to the instruction from the wiring path det timing circuit S to be tested, the switch in the switching circuit 7 is switched to 14-pin 8W/short circuit detection circuit as shown in the figure. Connect to to detect short circuit. In this case, if the wiring path 9 to be tested is short-circuited, the timing circuit g in response to an instruction from the decoder 6 issues an instruction to the changeover switch to stop proceeding to the next step, and also outputs that the wiring path is short-circuited.

On the other hand, if there is no short circuit, the timing circuit S instructs the switch SW of the switching circuit to switch to terminal 8WJ, connects the gong line to the comparator for identifying the half-short circuit state, and connects the gong line to the comparator reference for identifying the half-short circuit state. If the result of the comparison is a half-short circuit, the decoder 6 outputs that it is a half-short circuit. Also, if there is no half-short circuit, the same timing circuit as above.
At the timing of , the signal is connected to the comparator 3 for disconnection identification and compared with the setting device 1, and the comparison result is compared with the setting device 1.

If the wire is disconnected, the decoder 6 outputs a message indicating that it is disconnected. If the wire is not disconnected, it is identified as normal wiring by the logic of the manual state of the decoder 6 at the timing of timing Nr&, and the decoder 6 outputs a message indicating that it is normal. It is output that it is a wiring.

It is clear from the above explanation that in the present invention, each listening test item is checked, i.e., short circuit, half short circuit, disconnection, normal wiring or not.
When identifying, the wiring paths under test are sequentially identified depending on the timing.
Since switching to each of the identification circuits described above is performed, there is an effect that the wiring state can be easily and quickly identified without requiring a tester for each test item.

[Brief explanation of the drawing]

Fig. II1 shows a detailed diagram of the short circuit detection circuit in Fig. 1, which is a circuit diagram for implementing the present invention. In the figure, I and 2 are setters, and J and 2 are comparators. ! f is a short circuit detection circuit, 6 is a decoder, ? Vi switching circuit,
g indicates a timing circuit and 9ilt indicates a wiring path under test, respectively. Patent applicant: Japan Steel Works Co., Ltd. Agent: Dosho Soga Figure V

Claims (1)

[Claims] In a wiring tester for identifying wiring conditions, disconnection,
First, to identify half-short circuits. the first setting device and #E/,
An identification circuit consisting of a IIJ comparator and a short circuit detection circuit for identifying short circuits. a ninth decoder that identifies a short circuit, a short circuit, and a disconnection based on the identification results of the disconnection, short circuit, and half-short circuit;
Furthermore, it consists of a tie-setting circuit and a switching circuit for sequentially switching the wiring path under test to the identification a circuit according to the timing, and inputs for short circuit, short circuit, and disconnection of the identification circuit to sequentially switch the wiring path under test to the identification circuit t according to the timing. A wiring tester characterized by switching to a terminal and identifying the wiring state.