CN214591435U

CN214591435U - Impedance insensitive telephone line fault tester

Info

Publication number: CN214591435U
Application number: CN202120870046.4U
Authority: CN
Inventors: 董善杰; 李广威; 马雪峰
Original assignee: Shanghai Datun Energy Resources Co Ltd Jiangsu Branch
Current assignee: Shanghai Datun Energy Resources Co Ltd Jiangsu Branch
Priority date: 2021-04-26
Filing date: 2021-04-26
Publication date: 2021-11-02
Anticipated expiration: 2031-04-26

Abstract

The utility model relates to a telephone line fault monitoring technology field especially relates to an insensitive telephone line fault tester of impedance. The testing device comprises a shell, a testing port, a rectifier stack circuit, a low-pass filter circuit, a power circuit, a voltage follower circuit, an A/D conversion circuit, an MCU circuit and a display screen, and has the advantages that the impedance influence of testing equipment on a communication system can be effectively eliminated in the telephone line detection process, the measurement is accurate, the structure is simple, and the operation is convenient.

Description

Impedance insensitive telephone line fault tester

Technical Field

The utility model relates to a telephone line fault detection technical field especially relates to an insensitive telephone line fault tester of impedance.

Background

With the development of communication industry, telephones are necessary contact means and office tools in work and life, but telephone lines often break down during use. At present, test instruments such as an electric hunting instrument, a network telephone tester, a test line telephone and the like are commonly used in telephone line maintenance. They have the following disadvantages, respectively: the hunting instrument can seek the needed line in a pile of unmarked telephone lines, but is limited to short distance, and needs to send voltage at one end of the line, but can not play the role of checking and detecting the line; the network telephone tester has to disconnect the end lines at the two ends of the telephone line to test the two ends, which is similar to the test of the hunting instrument, and the network telephone tester mainly has the functions of detecting the connection and disconnection of the line, but has limited distance of the line and incomplete functions; the multipurpose plug of the test line telephone is provided with a clamp and a double-sided plug, and has the defects that the two sides of the plug are communicated, when faults are checked, the upper end of a cell differential junction box is connected with a machine room distribution frame, the lower end of the cell differential junction box is connected with a user line, and if the line is obstructed when the faults are checked, the problem that whether the line is from an A end to a B end or from the B end to a C end cannot be judged, and the line needs to be hooked down by a line clamp for checking. In the three devices, a load is formed by self impedance in an access telephone line, so that impedance influence is caused on a communication system, and the three devices do not have a voltage display function and cannot visually check measured voltage data for data analysis.

SUMMERY OF THE UTILITY MODEL

For overcoming the not enough of above-mentioned prior art, the utility model provides an impedance insensitive telephone line fault tester can effectively eliminate the impedance influence of test equipment to communication system.

The utility model discloses a following technical scheme realizes: an impedance insensitive telephone line fault tester comprises a shell, a test port, a rectifier stack circuit, a low-pass filter circuit, a power circuit, a voltage follower circuit, an A/D conversion circuit, an MCU circuit and a display screen; the test port is electrically connected with the rectifier stack circuit; the rectifier stack circuit is electrically connected with the low-pass filter circuit; the low-pass filter circuit is electrically connected with the voltage follower circuit, and the voltage follower circuit is respectively and electrically connected with the power supply and the A/D conversion circuit; the A/D conversion circuit is electrically connected with the MCU control circuit; the MCU control circuit is electrically connected with the display screen.

The utility model discloses an insensitive telephone line fault tester of impedance, owing to adopted rectifier pile circuit, low pass filter circuit, power supply circuit, voltage follower circuit, AD converting circuit, MCU circuit and display screen, can effectively eliminate test equipment to communication system's impedance influence, have and measure accurately, simple structure, advantages such as convenient operation.

Drawings

Fig. 1 is a schematic diagram of the circuit structure of the present invention.

Fig. 2 is an external front view of the present invention.

Fig. 3 is a top view of the present invention.

In the figure: 1. detection plug 2, shell 3, display screen 4, power switch 5, RJ11 interface

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1, 2 and 3, an impedance insensitive telephone line fault tester comprises a shell 2 and a test port, wherein a rectifier stack circuit, a low-pass filter circuit, a power supply circuit, a voltage follower circuit, an a/D conversion circuit, an MCU circuit and a display screen 3 are arranged in the shell. The test port is connected with the rectifier stack circuit; the rectifier stack circuit is connected with the low-pass filter circuit; the low-pass filter circuit is connected with the voltage follower circuit; the voltage follower circuit is respectively connected with the power circuit and the A/D conversion circuit; the A/D conversion circuit is connected with the MCU circuit; the MCU circuit is connected with the display screen 3. Wherein, the shell 2 is made of ABS material. The test port comprises an RJ11 interface 5 and a test plug 1, wherein the RJ11 interface 5 is used for connecting a line to be tested, and the test plug 1 is used for connecting a line module. The RJ11 interface 5 is installed on the top of the casing 2, one end of the detection plug 1 is a single-side conducting plug, and the other end is an RJ11 plug, wherein the RJ11 plug is inserted into the RJ11 interface 5 to form a separable connection. The single-side conduction plug of the detection plug 1 is a contact single-side conduction plug, can separate the upper line and the lower line of a telephone line, and is convenient for judging a fault point during detection. The rectifier stack circuit adopts the bridge rectifier circuit to be optimal, and the polarity of the input end does not need to be distinguished in the detection process, so that the detection process is more convenient and quicker. The low-pass filter circuit is a second-order RC passive low-pass filter. The tester is provided with a power supply circuit and a voltage follower circuit, the whole tester belongs to active equipment, and the current loss during detection is supplied by the equipment per se so as to eliminate the influence of the equipment on the impedance of a communication system. The power circuit comprises a battery and a power switch 4, and the power switch 4 is a self-locking button switch. The A/D conversion circuit converts the voltage analog signal in the communication line into a digital signal, and the MCU circuit processes the digital signal. The display screen 3 displays the voltage value of the measuring line, so that the detection personnel can conveniently analyze the data. The display screen 3 is an LED digital display screen.

The signal is accessed into the tester by RJ11 interface 5 or detection plug 1 of test port, through rectifier circuit and low pass filter circuit, changes alternating current signal into direct current signal, and voltage follower passes through, and the analog signal of voltage in the communication line is converted into digital signal by the AD converting circuit, and after MCU circuit processing, the voltage is displayed on display screen 3.

When the tester is used, the power switch 4 is turned on, the detection plug 1 is inserted into a circuit module, or a circuit to be tested is accessed through the RJ11 interface 5. The specific line fault is judged by observing the voltage value displayed by the display screen 3.

The above is one of the embodiments of the present invention, and the actual configuration is not limited to this. Therefore, if a person skilled in the art is informed by the teaching of the present invention, without departing from the spirit of the present invention, the present invention shall not be limited to the embodiments and structural modes similar to the above technical solutions.

Claims

1. An impedance insensitive telephone line fault tester, characterized by: the testing device comprises a shell (2), a testing port, a display screen, a rectifier stack circuit, a low-pass filter circuit, a power supply circuit, a voltage follower circuit, an A/D (analog/digital) conversion circuit and an MCU (microprogrammed control unit) control circuit, wherein the rectifier stack circuit, the low-pass filter circuit, the power supply circuit, the voltage follower circuit, the A/D conversion circuit and the MCU control circuit are arranged in the shell; the test port is electrically connected with the rectifier stack circuit; the rectifier stack circuit is electrically connected with the low-pass filter circuit; the low-pass filter circuit is electrically connected with the voltage follower circuit, and the voltage follower circuit is respectively and electrically connected with the power supply and the A/D conversion circuit; the A/D conversion circuit is electrically connected with the MCU control circuit; the MCU control circuit is electrically connected with the display screen.

2. An impedance insensitive telephone line fault tester as recited in claim 1, characterized by: the testing port comprises an RJ11 interface (5) used for connecting a circuit to be tested and a detection plug (1) used for connecting a circuit module, the RJ11 interface (5) is installed at the top of the shell, and the detection plug (1) is detachably connected with the RJ11 interface.

3. An impedance insensitive telephone line fault tester as claimed in claim 2, wherein: one end of the detection plug (1) is a single-side conducting detection plug, and the other end of the detection plug is an RJ11 plug connected with an RJ11 interface (5).

4. An impedance insensitive telephone line fault tester as recited in claim 3, characterized by: the single-side conduction detection plug is a contact single-side conduction plug.

5. An impedance insensitive telephone line fault tester as recited in claim 1, characterized by: the rectifier stack circuit is a bridge rectifier circuit.

6. An impedance insensitive telephone line fault tester as recited in claim 1, characterized by: the low-pass filter circuit is a second-order RC passive low-pass filter circuit.

7. An impedance insensitive telephone line fault tester as recited in claim 1, characterized by: the power supply circuit comprises a battery and a power switch (4).

8. An impedance insensitive telephone line fault tester as recited in claim 7, characterized by: the power switch (4) is a self-locking button switch.

9. An impedance insensitive telephone line fault tester as recited in claim 1, characterized by: the display screen is an LED digital display screen.