CN202854270U - A circuit test device for a signal transmission line - Google Patents

Abstract

The utility model discloses a signal transmission line's circuit testing arrangement, its characterized in that is including the DC power supply who connects in order, two way output control switch, be used for inserting the interface arrangement who is surveyed signal transmission line and be used for instructing the LED pilot lamp sequence of being surveyed each wire route of signal transmission line, the short circuit condition. The beneficial effects of the utility model are that detect out the short circuit condition of adjacent winding displacement through the mode of winding displacement cross dislocation, detect out the condition of opening circuit of winding displacement through the mode that the winding displacement links to each other with the pin, realize the quick simple test to signal transmission line.

Description

A circuit test device for a signal transmission line

[technical field]

The utility model relates to a circuit testing device for a signal transmission line, which belongs to the field of electrical circuits.

[Background technique]

The signal transmission line of the 3MW wind power converter is responsible for the connection bridge of the signal communication between the controller and the power module. As shown in Figure 1, the signal transmission line is composed of a DB15 connector, a 14P1.27mm cable, and an IDC14 interface . Among them, the DB 15 interface is connected to the controller, and the IDC14 is connected to the IGBT driver module to realize the signal transmission between the controller and the IGBT driver module. The open circuit problem causes the entire system not to operate normally, and even damages the controller or the IGBT drive module. Currently, there are no devices on the market for testing such transmission lines.

Existing methods for manually testing signal transmission lines have the following disadvantages:

1. The existing test method uses a multimeter to test. The multimeter cannot be directly inserted into the hole of the two connectors of the signal transmission line. It needs to connect a smaller wire at the multimeter pen to extend into the hole for testing;

2. The test time is long, and each wire in the signal transmission line must be tested, and whether there is a short circuit between the two, and the number of tests is large;

3. Two people are required to carry out the test, and one person holds a test lead and a connector to test.

[utility model content]

The utility model overcomes the deficiencies of the above-mentioned technologies, and provides a circuit test device for signal transmission lines, which supplies power to the odd pin group and the even pin group on each socket in turn through two-way selection switches and indicates by observing LEDs. The light sequence is lit, so that the short circuit of the cable can be detected according to the way the cable is crossed and misplaced, and the open circuit of the cable can be detected by the way that the cable is connected to the pin, and the metal shell of the second socket can be connected with the LED of the corresponding serial number. The output terminal connection of the indicator light sequence detects whether there is a problem that the signal transmission line under test is short-circuited with the metal casing.

In order to achieve the above object, the utility model adopts the following technical solutions:

A circuit testing device for a signal transmission line, comprising a sequentially connected DC power supply 1, a two-way output control switch 2, an interface device 3 for connecting a signal transmission line under test, and an indicator for each wire of the signal transmission line under test The LED indicator sequence 4 of access and short circuit conditions, the interface device 3 includes a first socket 31 for accessing the plug at one end of the signal transmission line under test and a second socket 32 for accessing the plug at the other end of the signal transmission line under test, The first socket 31 is provided with an odd-numbered pin group 311 and an even-numbered pin group 312 corresponding to the serial number of the signal transmission line to be tested. Connect all the pins above, the other output end of the two-way output control switch 2 is connected to all the pins on the even-numbered pin group 312, and the LED indicator sequence 4 is provided with an input end corresponding to the serial number of the signal transmission line under test Each pin of the output end of the second socket 32 is connected to the input end of the LED indicator sequence 4 corresponding to the serial number, and the output end of the LED indicator sequence 4 is connected to the other end of the DC power supply 1 .

The two ends of the two-way output control switch 2 are also connected in parallel with a three-pin pin switch 21 for backup use. The middle pin of the three-pin pin switch 21 is connected to the input end of the two-way output control switch 2. The pins on both sides are correspondingly connected with the two output ends of the two-way output control switch 2 .

Described first socket 31 is IDC14 socket, and each pin on the odd serial number pin group 311 of IDC14 socket is connected and is connected with an output end of two-way output control switch 2, and each pin on the even serial number pin group 312 of IDC14 socket After the pins are connected, they are connected to the other output end of the two-way output control switch 2; the second socket 32 is a DB15 socket, and each pin on the output end of the DB15 socket is connected to the input end of the LED indicator sequence 4 of the corresponding serial number respectively. connect.

As optimization, the first socket 31 is an IDC26 socket, each pin on the odd-numbered pin group 311 of the IDC26 socket is connected to an output end of the two-way output control switch 2, and the even-numbered pin group of the DC26 socket Each pin on the 312 is connected to the other output end of the two-way output control switch 2 after being connected; the second socket 32 is a DB25 socket, and each pin on the output end of the DB25 socket is connected to the LED indicator light of the corresponding serial number respectively. Sequence 4 input connection.

As an optimization, the first socket 31 is a DB25 male socket, each pin on the odd serial number pin group 311 of the DB25 male socket is connected to an output end of the two-way output control switch 2, and the even serial number of the DB25 male socket Each pin on the pin group 312 is connected to the other output end of the two-way output control switch 2 after being connected; the second socket 32 is a DB25 female socket, and each pin of the output end of the DB25 female socket is connected to the corresponding serial number respectively. The LED indicator sequence 4 inputs are connected.

The metal casing of the second socket 32 is connected to the LED indicator sequence 4 as mentioned above.

The beneficial effects of the utility model are:

1. The principle is simple, but the practicability is extremely strong. The short circuit of adjacent cables can be detected by the way of crossing and dislocation of the cables, and the open circuit of the cables can be detected by connecting the cables to the pins.

2. Connect the metal shell of the second socket to the input terminal of the LED indicator sequence with the corresponding serial number, so as to detect whether there is a short circuit between the cable and the metal shell of the signal transmission line in the signal transmission line under test.

3. It only needs one person to operate, which saves labor. After connecting the signal transmission line under test, just turn on the switch and observe the indicator light to identify whether there is a problem with the cable.

4. Only the corresponding interface device can be installed to test the open circuit and short circuit of various types of signal transmission lines, with good compatibility and expandability.

5. The test time is short, which greatly improves the test efficiency.

6. There is no need for a controller chip, which can reduce the cost of product manufacturing.

7. Equipped with a spare switch for easy backup.

[Description of drawings]

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic circuit diagram of the utility model.

Fig. 3 is a physical schematic diagram of the utility model.

[Detailed ways]

Below in conjunction with accompanying drawing and embodiment of the present utility model, further describe in detail:

As shown in Figure 1, a circuit testing device for a signal transmission line is characterized in that it includes a DC power supply 1 connected in sequence, a two-way output control switch 2, an interface device 3 for connecting the signal transmission line to be tested, and a In order to indicate the LED indicator sequence 4 of each wire path and short circuit condition of the signal transmission line under test, the interface device 3 includes a first socket 31 for accessing a plug at one end of the signal transmission line under test and a first socket 31 for accessing the signal transmission line under test. The second socket 32 of the plug at the other end, the first socket 31 is provided with an odd-numbered pin group 311 and an even-numbered pin group 312 corresponding to the sequence number of the signal transmission line to be tested, and the two-way output control switch 21 The output end is connected to all pins on the odd-numbered pin group 311, the other output end of the two-way output control switch 2 is connected to all pins on the even-numbered pin group 312, and the LED indicator sequence 4 is provided with the measured The input end corresponding to the serial number of the signal transmission line, the output pins of the second socket 32 are connected to the input end of the LED indicator sequence 4 corresponding to the serial number, and the output end of the LED indicator sequence 4 is connected to the other end of the DC power supply 1 .

The above-mentioned two-way output control switch 2 can be left blank when not performing test work, and the DC power supply 1 uses a 9V battery.

As mentioned above, the pin numbers of the first socket 31 correspond to the serial numbers of the signal transmission lines, and the serial numbers of the signal transmission lines are arranged sequentially, so the wires of the signal transmission lines corresponding to the pins in the odd-numbered pin group 311 are not adjacent to each other. , similarly, the wires of the signal transmission lines corresponding to the pins in the even-numbered pin group 312 are not adjacent to each other.

As mentioned above, the LED indicator sequence 4 of the utility model is provided with 26 groups of LED indicator circuits composed of light-emitting diodes and resistors, and the input ends of each LED indicator circuit are respectively connected to the second socket 32 pins of the corresponding serial numbers. Connection, indicating the path and short circuit of the cable.

As mentioned above, the two ends of the two-way output control switch 2 are also connected in parallel with a three-pin pin switch 21 for backup use. The middle pin of the three-pin pin switch 21 is connected to the input end of the two-way output control switch 2. The pins on both sides of the pin are connected to the two output ends of the two-way output control switch 2 respectively. The three-pin pin switch 21 is used as a backup switch. When the two-way output control switch 2 fails, as long as the metal conductor is used to connect the two ends of 1 and 2, or connect the two ends of 2 and 3, the device can be operated for testing.

Embodiment 1, the first socket 31 is an IDC14 socket, and each pin on the odd-numbered pin group 311 of the IDC14 socket is connected to an output end of the two-way output control switch 2, and the even-numbered pin group of the IDC14 socket is Each pin on the 312 is connected to the other output end of the two-way output control switch 2 after being connected; the second socket 32 is a DB15 socket, and each pin on the output end of the DB15 socket is connected to the LED indicator light of the corresponding serial number respectively. Sequence 4 input connection.

As shown in Figure 2, the reason for the grouping of the above-mentioned IDC14 sockets is that the structure of the IDC14 sockets and the signal transmission cable is determined. The odd-numbered pin group 311 includes pins 1, 3, 5, 7, 9, 11, 13, and the even-numbered pin group 312 includes pins 2, 4, 6, 8, 10, 12, 14, and the signal transmission line The other end of the DB15 plug is connected to the DB15 socket of the device. When the two-way output control switch 2 is turned to the position of the odd-numbered pin group 311 or the even-numbered pin group 312, the wires spaced apart on the cable will be energized. When the LED When the LED light corresponding to the wire that indicates that there is electricity on the indicator light sequence 4 is not on, it means that the wire corresponding to the LED light that is not on is broken; It shows that the wire on the signal transmission line corresponding to the lit LED light is short-circuited with its adjacent wire. This achieves the purpose of this design and quickly and conveniently tests the short-circuit and open-circuit conditions of the signal transmission line.

As mentioned above, the metal shell of the DB15 socket is connected to the input terminal numbered LED26 in the LED indicator sequence 4, which is used to test whether the signal transmission line under test is short-circuited with the metal shell of the signal transmission line plug.

Embodiment 2, the first socket 31 is an IDC26 socket, each pin on the odd-numbered pin group 311 of the IDC26 socket is connected to an output end of the two-way output control switch 2, and the even-numbered pin group of the DC26 socket Each pin on the 312 is connected to the other output end of the two-way output control switch 2 after being connected; the second socket 32 is a DB25 socket, and each pin on the output end of the DB25 socket is connected to the LED indicator light of the corresponding serial number respectively. Sequence 4 input connection

As shown in Figure 2, the reason for the grouping of the IDC26 sockets is the same as the reason for the grouping of the IDC14 sockets above. It is determined by the structure of the IDC26 sockets and the signal transmission line. The order of the cables is 1, 2, 3... 24, 25, 26, like this, the odd serial number pin group 311 of IDC26 plug includes pin 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, even serial number pin Group 312 includes pins 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26. The IDC26 socket is connected to the IDC26 plug of the signal transmission line under test, and the other end of the signal transmission line is DB25 The plug is connected to the DB25 socket of this device. When the two output control switches 2 are turned to the position of the odd-numbered pin group 311 or the even-numbered pin group 312, the wires spaced apart on the cable will be energized. When the LED indicator light sequence When the LED light corresponding to the wire indicating that there is electricity on 4 is not on, it means that the wire corresponding to the LED light that is not on is broken; The bright LED light corresponding to the wire on the signal transmission line under test is short-circuited with its adjacent wires, which achieves the purpose of this design and quickly and conveniently tests the short-circuit and open-circuit conditions of the signal transmission line.

The above-mentioned circuit testing device is used to test the IDC26-DB25 signal transmission line, and the metal shell of the DB15 socket is connected to the input terminal numbered LED26 in the LED indicator sequence 4, and is used to test whether the signal transmission line under test has a cable and a signal The metal shell of the transmission line plug is shorted.

As mentioned above, similarly, a DB25 male socket can be added to the first socket 31, which works together with the DB25 female socket added to the second socket 32 to test the DB25-DB25 signal transmission line.

As shown in Figure 3, in practical applications, power indicator lights and fault indicator lights can also be added, which is more convenient for testers to use.

The specific settings of the above specific embodiments are just to make people more aware of the working principle and working effect of the present utility model, and are not intended to limit the scope of protection of the present utility model. Those skilled in the art can easily increase the compatibility of the interface device 3 according to the technical solution. Types, thereby increasing the types of test for signal transmission lines, all circuit test devices for signal transmission lines designed according to this technical solution or technical inspiration should be shown as falling within the scope of protection of this case.

Claims (6)

1. A circuit test device for a signal transmission line, characterized in that it includes a sequentially connected DC power supply (1), a two-way output control switch (2), an interface device (3) for connecting the signal transmission line to be tested, and an LED indicator sequence (4) for indicating the path and short circuit of each conductor of the signal transmission line under test, the interface device (3) includes a first socket (31) for connecting a plug at one end of the signal transmission line under test and The second socket (32) for connecting the plug at the other end of the signal transmission line under test, the first socket (31) is provided with an odd-numbered pin group (311) and an even-numbered pin group corresponding to the serial number of the signal transmission line under test Pin group (312), one output end of the two-way output control switch (2) is connected to all pins on the odd-numbered pin group (311), and the other output end of the two-way output control switch (2) is connected to the even-numbered pin group All pins on the pin group (312) are connected, the LED indicator sequence (4) is provided with an input terminal corresponding to the serial number of the signal transmission line under test, and each pin of the output terminal of the second socket (32) is connected to the The input end of the LED indicator sequence (4) corresponding to the serial number is connected, and the output end of the LED indicator sequence (4) is connected with the other end of the DC power supply (1). 2. A circuit test device for a signal transmission line according to claim 1, characterized in that a three-pin pin switch (21) for backup use is connected in parallel at both ends of the two-way output control switch (2), and the The middle pin of the three-pin pin switch (21) is connected to the input ends of the two-way output control switch (2), and the pins on both sides of the three-pin pin switch (21) are respectively connected to the two output ends of the two-way output control switch (2). 3. A circuit testing device for a signal transmission line according to claim 1, characterized in that the first socket (31) is an IDC14 socket, and the pins of the odd-numbered pin groups (311) of the IDC14 socket are connected to each other After that, it is connected to one output end of the two-way output control switch (2), and each pin on the even-numbered pin group (312) of the IDC14 socket is connected to the other output end of the two-way output control switch (2); The second socket (32) is a DB15 socket, and each pin on the output end of the DB15 socket is respectively connected to the input end of the LED indicator sequence (4) of the corresponding serial number. 4. A circuit testing device for a signal transmission line according to claim 1, characterized in that the first socket (31) is an IDC26 socket, and the pins on the odd-numbered pin group (311) of the IDC26 socket are connected to each other Connect with one output end of the two-way output control switch (2) afterward, each pin on the even-numbered pin group (312) of the DC26 socket is connected and then connected with the other output end of the two-way output control switch (2); The second socket (32) is a DB25 socket, and each pin on the output end of the DB25 socket is respectively connected to the input end of the LED indicator sequence (4) of the corresponding serial number. 5. A circuit testing device for a signal transmission line according to claim 1, characterized in that the first socket (31) is a DB25 male socket, and each pin on the odd-numbered pin group (311) of the DB25 male socket After being connected, it is connected to one output end of the two-way output control switch (2), and each pin on the even-numbered pin group (312) of the DB25 male socket is connected to the other output end of the two-way output control switch (2). The second socket (32) is a DB25 female socket, and each pin of the output end of the DB25 female socket is respectively connected to the input end of the LED indicator sequence (4) of the corresponding serial number. 6. A circuit testing device for a signal transmission line according to claim 3, 4 or 5, characterized in that the metal casing of the second socket (32) is connected to the LED indicator sequence (4).

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