CN2446524Y - Transmission line measuring device - Google Patents

Abstract

A transmission line measuring device comprises a main machine and an auxiliary machine, when a transmission line is inserted in the main machine and the auxiliary machine, a central processing unit in the main machine sends out measuring signals in sequence and then sends pulse signals to the inside of the auxiliary machine, when a loop of a second display unit of the auxiliary machine is in a grounding state, current can be returned to the main machine by utilizing the grounding state, and therefore, a first display unit and a second display unit are sequentially lightened, and the test of the transmission line can be completed in a very short time.

Description

Transmission line measuring device

The utility model relates to a measuring device, in particular to a transmission line measuring device for measuring whether there is an open circuit, a short circuit or a wrong connection of a wire inside a transmission line.

Generally, when using a computer, it is often encountered that after the computer outputs a signal, the peripheral device cannot be driven, or the computer cannot receive or calculate the signal that the peripheral device responds to. It is caused by a problem with the transmission line that the computer transmits or receives data and signals to the outside, or it is caused by an internal short circuit.

The existing transmission line test method is to connect the transmission line to two test instruments respectively after the transmission line is manufactured, and after the transmission line is connected to the two test instruments, the two test instruments transmit data relative to each other, and then observe one of the test instruments Whether the data transmitted by another test instrument received is correct. If it is correct, it means that the transmission line is normal. If the displayed data is incorrect, it means that there is a problem with the transmission line. Although it can be known whether the transmission line is normal through this test method, the test is troublesome, and if there is a problem in the test, it is not known which wire inside the transmission line has the problem.

Therefore, some people in the industry use the simplest method to test. When measuring the transmission line, connect the transmission line to the test device and power on the transmission line at the same time. If the light-emitting diode (bulb) connected to one end of the transmission line is not lit, it means that There is a problem with that wire. Although this test method is simple and easy, if the light-emitting diode malfunctions, if there is no problem with the internal wire of the transmission line but the light-emitting diode does not light up, or there is a problem with the internal wire of the transmission line but the light-emitting diode is ignited due to an external short circuit When situations such as bright light occur, it will lead to misjudgment by testers, resulting in unqualified transmission lines being listed on the market.

The main purpose of this utility model is to solve the above-mentioned traditional deficiencies, and provide a measurement method (but not limited to this) that uses nine lines to light up nine lamps to measure whether there is an open circuit, a short circuit, or a wrong line connection in the internal wire of the transmission line. transmission line measuring device.

Another object of the present invention is to provide a transmission line measurement device that can complete the test of a transmission line in a very short time.

In the utility model, when the transmission line is plugged into the main machine and the auxiliary machine, the central processing unit in the main machine sends out pulse signals in sequence, and the pulse signal will be sent to the inside of the auxiliary machine. When the second display unit of the auxiliary machine has a loop for grounding state, the grounding state can be used to allow the current to flow back into the host. In this way, the first display unit and the second display unit are sequentially lit, and the test of a transmission line can be completed in a very short time.

The effect of the utility model is that the test of a transmission line can be completed in a very short time, and it is possible to know which wire inside the transmission line has a problem.

Below is the description of the accompanying drawings of the utility model:

Fig. 1 is a schematic diagram of a measuring device assembled with a transmission line of the present invention.

Fig. 2 is a circuit block diagram of the measuring device of the present invention.

FIG. 3 is a schematic diagram of the host circuit circuit in FIG. 2 .

FIG. 4 is a schematic diagram of the auxiliary machine circuit in FIG. 2 .

Fig. 5 is a schematic diagram of the measurement waveform of the present invention.

Below in conjunction with accompanying drawing, the utility model is described in detail.

As shown in Figure 1, the transmission line measurement device of the present invention is composed of a main machine 1 and an auxiliary machine 2. The aforementioned main machine 1 and auxiliary machine 2 each have the same connectors 11, 11' for connecting different transmission lines 3, 21, 21', when the transmission line 3 is plugged into the aforementioned connectors 11, 21, and the measurement method (but not limited to this) of lighting up nine lamps with nine lines is used to measure whether there is an open circuit in the internal wire of the aforementioned transmission line 3, Short circuit or wrong wiring.

Referring to FIGS. 2 , 3 , and 4 , the aforementioned main unit includes a power supply unit 12 , a central processing unit 13 , and a first display unit 14 , while the auxiliary unit 2 is composed of a second display unit 22 .

The power supply unit 12 of the above-mentioned mainframe 1 mainly provides the power required by circuits at all levels;

This central processing unit 13 has control software, and the measurement signal of each division of 2 (or non-division 2) of A～I shown in Figure 5 is stored in the memory (not shown) inside the central processing unit 13 , and each measurement signal output end of the central processing unit 13 is connected to connectors 11, 11' of different pin numbers, when testing the transmission line, the central processing unit 13 will send the aforementioned measurement signal divided by 2;

The first display unit 14 is composed of a plurality of light emitting diodes (LEDs), and one end of each light emitting diode is connected to the pulse output end of the central processing unit 13;

The second display unit 22 of the auxiliary machine 2 is composed of a plurality of light-emitting diodes (LEDs), and each light-emitting diode is connected in parallel with a diode, and one end of each light-emitting diode is connected together, and the other end is connected with a different number of pins. The connectors 21, 21' form a loop that can send the pulse signal from the host 1 back to the host 1.

When the transmission line 3 is plugged into the connector 11 of the host 1 and the connector 21 of the slave 2, or the connector 11' of the host 1 and the connector 21' of the slave 2, and after the power supply unit 12 supplies power, the host The central processing unit 13 of 1 will send the pulses shown in Figure 5 to the auxiliary machine 2 in sequence, after the internal memory of the central processing unit 13 sends a measurement signal, the timer inside the central processing unit 13 (not shown in the figure) display) will automatically perform a counting operation minus 1. When the measurement signal is sent to the second display unit 22 inside the auxiliary machine 2 to light up the first light-emitting diode, the rest of the light-emitting diodes are considered to be in a grounded state, so the auxiliary machine 2 The current can be returned to the host computer 1 through this ground, so that the first light-emitting diodes of the first and second display units 14, 22 can be turned on. In this way, each light-emitting diode is turned on sequentially at intervals of 0.25 seconds. Due to the above The measurement signal is a continuous high potential (HI) and low potential (LOW), so the light-emitting diodes of the first and second display units are flashing rapidly, but due to the persistence of human vision, they will feel lit The light-emitting diodes are always lit until the light-emitting diodes of the first and second display units 14, 22 are all lighted, and then the test of one transmission line 3 can be completed.

During the above-mentioned test, if the light-emitting diodes corresponding to the first display unit 14 and the second display unit 22 are not lit, it means that the wire inside the transmission line 3 is disconnected; if so, the first display unit 14 and the second display unit When the light emitting diodes corresponding to the unit 22 are lit in reverse order (for example, the ninth light emitting diode is lighted first), it means that the wire inside the transmission line 3 has a problem of jumping or reverse connection; if so, the first display unit 14 When the two light emitting diodes corresponding to the second display unit 22 but not according to the lighting sequence are turned on at the same time, it means that the wires inside the transmission line 3 are short-circuited.

Therefore, in the above test method of sequentially lighting up each LED corresponding to the first display unit 14 and the second display unit 22 , it is possible to accurately and quickly measure whether the transmission line is good or not.

Claims (9)

1. A transmission line measurement device, characterized in that the device includes: a host computer, which has a central processing unit and a first display unit storing measurement signals for testing, and one end of the first display unit is connected to the central On the measurement signal output terminal of the processing unit; an auxiliary machine, which has a second display unit, and one end of each circuit of the second display unit is connected together, and the second display unit forming the auxiliary machine has one circuit that is grounded A circuit that allows current to flow back. 2. The transmission line measurement device as claimed in claim 1, wherein the host computer further includes a power supply unit for supplying power required by each circuit. 3. The transmission line measurement device as claimed in claim 1, wherein the measurement signal stored in the central processing unit is a divided by 2 or non-divided by 2 measurement signal. 4. The transmission line measurement device as claimed in claim 3, wherein a memory for storing measurement signals is provided inside the central processing unit. 5. The transmission line measuring device according to claim 1 or 3, characterized in that: the central processing unit is provided with a counter which counts down by 1 after each measurement signal is sent. 6. The transmission line measurement device according to claim 1 or 3, wherein the measurement signal output terminals of the central processing unit are all connected to connectors with different numbers of pins. 7. The transmission line measurement device as claimed in claim 1, wherein the first display unit is composed of a plurality of light emitting diodes. 8. The transmission line measuring device as claimed in claim 1, wherein the second display unit is composed of a plurality of light emitting diodes, and a diode is connected in parallel to each light emitting diode. 9. The transmission line measuring device as claimed in claim 8, wherein one end of the LED is connected to connectors with different numbers of pins.

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