CN103076534B - Strip connector electrical on-off test method and test circuit thereof - Google Patents

Abstract

The present invention relates to a strip connector electrical on-off test method and its test circuit. A good strip connector is connected to the tested strip connector through the above method. If the tested strip connector is also connected to the good If the wiring of the strip connectors is consistent, the lines are connected in one-to-one correspondence, otherwise, they cannot be connected in one-to-one correspondence. In this way, it can be judged whether the wiring of the strip connector is correct. By using low-frequency pulse current to pass through each path sequentially, "time-sharing pass" is realized. Through two-color light-emitting diodes, if the colors are inconsistent, short-circuit problems can be detected. The two-color light-emitting diodes display the on-off state of each current. The switch is responsible for connecting the vacant positions of the strip connector for easy observation. The buzzer Y is responsible for capturing the intermittent "blocked" state that occurs when the circuit is poorly connected. The invention realizes the concept of universality, reliability and high efficiency, can test various devices, has strong expansion ability and wide practicability.

Description

Strip connector electrical continuity test method and test circuit

technical field

The invention relates to the field of electronic circuits, in particular to a strip connector electrical on-off testing method and a testing circuit thereof.

Background technique

The strip connector is a classification of rectangular connectors, the basic structure is strip, the contacts are arranged in a single row, and the connector with strip mating surface is blocked in the circuit or between isolated circuits , Set up a bridge of communication, so that the current can flow, and the circuit can realize the predetermined function.

Because the electrical connection of the strip connector is relatively complicated, there are sequential connections; there are also cross or partial cross connections, there is no general test instrument for the on-off test, and the key is that there is no general test method.

Contents of the invention

The technical problem to be solved by the present invention is to propose a strip connector electrical on-off test method and its test using the principle of complementary wiring to solve the path problem; using "time-sharing pass" to detect short-circuit problems; circuit.

The technical solution adopted in the present invention is: a strip connector electrical on-off test method, comprising the following steps:

1) Connect the connecting pin of a good strip connector and the connecting pin of the tested strip connector through two analog switches one by one, and make the switch in the off state;

2) One of the time base circuits in the dual time base circuit constitutes a square wave generator to generate a square wave;

3) Connect the square wave generated in step 2) to the input terminal of the good strip connector in step 1), and the square wave signal will be output from the output terminal of the tested strip connector;

4) The square wave signal output in step 3) passes through another time base circuit in the dual time base circuit described in step 2) to detect whether one or several high-level waves are missing, so as to judge the strip connector In case of open circuit, wrong connection or poor contact, the buzzer will give an alarm; at the same time, the square wave signal output in step 3) will pass through the third analog switch to restore the square wave signal to the corresponding LED light signal. The LED light signal judges the open circuit, wrong connection or poor contact of the strip connector.

Since the frequency is too high, the LED display will be dimmed, and the frequency is too low, which will cause the LED to flicker more. Therefore, the frequency of the square wave in step 2) of the present invention is 290-310 Hz.

In step 1) of the present invention, if the pins of the strip connector are not fully plugged into all the sockets, switch all the vacant positions to the ON state.

For the convenience of observation, in step 4) of the present invention, the LEDs mentioned are all two-color diodes.

If the LED light of the present invention is displayed as brown, then the tested strip connector is normal; If it is not brown, the wiring of the strip connector under test is misaligned.

In order to ensure the normal operation of the circuit, the working voltage of the testing method of the present invention is not less than 11 volts.

At the same time, the present invention also provides a test circuit used in the electrical on-off test method of the strip connector, including three or more analog switches and a dual time base circuit; two of the analog switches The pins are connected one by one and the switch is in the off state; the dual time base circuit generates a square wave signal and outputs a high level signal through a binary counter and is connected to the input of the first analog switch; the second The first analog switch restores the high-level signal output by the first analog switch to a square wave signal; the second analog switch connects the dual time base circuit and the third analog switch, and the pins of the third analog switch correspond to The pin of the second analog switch has an LED light connected to it. The dual time base circuit is also connected with a buzzer. The circuit of the present invention can expand the number of test lines by increasing the number of analog switches, such as 25-core, 50-core strip connectors and the like. Replacing the strip connector socket can expand and test other connectors, such as D-type, round connectors, etc.

The working principle of the present invention is: a good strip coupler is connected with the tested strip coupler by the above method, if the tested strip coupler is also consistent with the good strip coupler wiring, then the circuit is one by one Corresponding to China Unicom, on the contrary, it cannot be connected in one-to-one correspondence. In this way, it can be judged whether the wiring of the strip connector is correct. By using low-frequency pulse current to pass through each path sequentially, "time-sharing pass" is realized. Through two-color light-emitting diodes, if the colors are inconsistent, short-circuit problems can be detected. The two-color light-emitting diodes display the on-off state of each current. The switch is responsible for connecting the vacant positions of the strip connector for easy observation. The buzzer Y is responsible for capturing the intermittent "blocked" state that occurs due to poor contact of the circuit.

The beneficial effects of the present invention are: the present invention realizes the concept of universality, reliability and high efficiency, can test various devices, has strong expansion ability and wide practicability.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the wiring diagram of the present invention;

Fig. 2 is a schematic circuit diagram of the present invention.

Detailed ways

The present invention will now be described in further detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

Connect a good strip connector to the tested strip connector by the method shown in Figure 1. If the tested strip connector is also connected to the good strip connector, the lines are in one-to-one correspondence. On the contrary, Then there is no one-to-one correspondence. In this way, it can be judged whether the wiring of the strip connector is correct.

As shown in Figure 2, the test circuit consists of a dual time base circuit LM556, one of which constitutes a square wave generator, which generates a square wave of about 300 Hz (too high frequency will cause the LED display of D3~D18 Dim, the frequency is too low will cause the LED to flicker more), output from the 9th pin to the CP port (1 pin) of the 7-bit binary counter CD4024, the strobe signal is generated by the CD4024, and provided to the three 16 analog switches CD4067.

The first CD4067 on the left outputs high levels from 0 to 15 output ports according to the order of the strobe signals of CD4024, and the sockets JK1, JK2, and JK3 provide the connection test for the strip connector. If the strip connector is not fully plugged Socket, then turn the switch K in the corresponding vacancy to the on state (others are off state, used to test the strip connector). The second CD4067 on the left restores the high-level signal output by the first CD4067 into a square wave signal and outputs it from pin 1.

The square wave signal output by the second CD4067 is detected by the following two parts. The first path detects whether the square wave and the signal lack one or several high-level waves through another time base circuit of LM556 (the strip connector is open. , misconnection and poor contact), the 5th pin of the time base circuit outputs a high potential when it is normal, and the buzzer Y does not sound. When the square wave signal output by the second CD4067 lacks one or more high voltages Usually, choose the appropriate value of capacitor C4 to make the 5th pin of the time base circuit jump to a low potential, and the buzzer will sound an alarm; the second channel restores the square wave signal to the corresponding LED light signal through the third CD4067, Since the power supply voltage passes through three analog switches and the buzzer produces a large voltage drop, the power supply voltage is introduced through a triode BG2 to enhance the brightness of the LED light. Normally, the LED light is brown. If a certain light is displayed as If it is not brown, it means that the line of the strip connector at the corresponding position is blocked. If there are two lights or a pair of lights that are not brown, it is possible that the wiring of the strip connector is misplaced. The LEDs are two-color diodes, and the other The pins are correspondingly connected to the "D3~D18" line on the left side of the second CD4067. If there is a short circuit on the second adjacent line of the bar connector (the plastic shell is "perforated", the steel wire is exposed during crimping, etc.), then the D3~D18 There must be two lamps or pairs of lamps emitting non-brown light.

What is described in the above description is only the specific implementation of the present invention, and various illustrations do not limit the essence of the present invention. Those of ordinary skill in the art can modify or modify the previous specific implementation after reading the description. variations without departing from the spirit and scope of the invention.

Claims (6)

1. A strip connector electrical continuity test method is characterized in that comprising the following steps: 1) Connect the connection pin of a good strip connector to the connection pin of the tested strip connector through two analog switches one by one, and make the switch in the off state; 2) A square wave generator is formed by one of the time base circuits in the dual time base circuit to generate a square wave; 3) the square wave that step 2) produces is connected to the input end of the good strip connector in step 1), and described square wave signal will be output from the output end of tested strip connector; Test circuit comprises three Two or more analog switches and a dual time base circuit; the pins of the two analog switches are connected one by one and the switch is in an off state; the dual time base circuit generates a square wave signal and outputs it through a binary counter The high-level signal is connected to the input terminal of the first analog switch; the second analog switch restores the high-level signal output by the first analog switch into a square wave signal; the second analog switch is connected to the dual time base circuit and The third analog switch, the pins of the third analog switch corresponding to the pins of the second analog switch are connected with LED lights; 4) The square wave signal output in step 3) goes through another time base circuit in the dual time base circuit described in step 2) to detect whether one or several high-level waves are missing, so as to judge the strip connector Open circuit, wrong connection or poor contact, and alarm through the buzzer; at the same time, the square wave signal output in step 3) passes through the third analog switch to restore the square wave signal to the corresponding LED light signal, according to The LED light signal judges the open circuit, wrong connection or poor contact of the strip connector; if the LED light is displayed in brown, the tested strip connector is normal; if a certain display is not brown, the corresponding position If there are two lights or a pair of lights showing non-brown, the wiring of the strip connector under test is misplaced. 2. The method for testing electrical continuity of a strip connector according to claim 1, wherein the frequency of the square wave in step 2) is 290-310 Hz. 3. The strip connector electrical continuity test method as claimed in claim 1, characterized in that: in the described step 1), if the pins of the strip connector are not fully inserted into all sockets, the switch will dial to connected state. 4. The electrical continuity test method of the strip connector according to claim 1, characterized in that: in the step 4), the LEDs are all two-color diodes. 5. The electrical continuity test method of the strip connector according to claim 1, characterized in that: the operating voltage of the test method is not less than 11 volts. 6. The electrical continuity test method of the strip connector according to claim 1, characterized in that: said dual time base circuit is also connected with a buzzer.