Adjustable impedance device

Abstract

The utility model relates to the technical field of electronic circuits, in particular to an adjustable impedance device, which comprises a shell. The plurality of resistance regulators are arranged on the shell at intervals, and every two adjacent resistance regulators are connected in series; the resistance regulators (2) are arranged in the shell, the two test probes are symmetrically arranged on the shell, one ends of the test probes are electrically connected with the adjacent resistance regulators, the other ends of the test probes are connected into a circuit to be tested, and the maximum resistance values of the resistance regulators (2) at least comprise 10 ohm, 100 ohm, 1 Kohm, 10 Kohm and 100 Kohm. In this way, adjustment is convenient, excessive manual participation is not needed, and efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to an adjustable impedance device. Background Art

[0002] In the signal design of a circuit, parameters such as Overshoot, Undershoot, Rise time, and Fall time need to be impedance-matched. It is necessary to continuously adjust the impedance of the corresponding signal, that is, continuously change the resistance value of the resistor in the circuit under test, so that the parameters meet the design requirements and ensure the integrity of the signal. Moreover, due to the high precision requirements of the signal, it is impossible to directly achieve impedance matching in one step. Therefore, the experimenter needs to change the resistance value a large number of times to obtain a final accurate value, so that the circuit under test generates a waveform required by the experimenter. In this process, the experimenter needs to replace the resistor on the circuit board many times, which involves the processes of soldering, desoldering, and re-soldering. Each process will be repeated many times, which will cause damage to the solder joints, damage to the components, and poor appearance of the board, and also consume a lot of manpower and time. Summary of the Invention

[0003] The purpose of the utility model is to provide an adjustable impedance device, which is convenient to adjust, requires little manual participation, and improves efficiency.

[0004] To achieve the above purpose, the utility model provides the following technical solutions:

[0005] An adjustable impedance device includes: a housing; a plurality of resistance regulators, which are arranged at intervals on the housing, and are connected in series between adjacent two of the resistance regulators; and two test probes, which are symmetrically installed on the housing, one end of the test probe is electrically connected to the adjacent resistance regulator, and the other end is connected to a circuit under test. Among them, the maximum resistance values of the plurality of resistance regulators (2) at least include 10 ohm, 100 ohm, 1 Kohm, 10 Kohm, and 100 Kohm.

[0006] Preferably, a calibration endpoint is arranged on the housing near the test probe, and the calibration endpoint is electrically connected to the adjacent test probe.

[0007] Preferably, the resistance regulator includes a potentiometer and an adjustment knob. The potentiometer is provided with a plurality of resistance value output terminals, and the resistance value output terminals between adjacent two potentiometers are electrically connected, and the adjustment knob is rotatably installed on the potentiometer.

[0008] Preferably, the resistance value output terminals between adjacent two potentiometers are connected through a retractable wire.

[0009] Preferably, the maximum resistance values of the plurality of resistance regulators gradually increase along the direction from left to right.

[0010] Preferably, there are five resistance regulators, and the maximum resistance values of the five resistance regulators are 10 ohm, 100 ohm, 1 Kohm, 10 Kohm, and 100 Kohm in sequence along the direction from left to right.

[0011] Preferably, one end of the test probe is electrically connected to the adjacent resistance regulator through a connecting wire.

[0012] Preferably, it further includes a support frame mounted on the test probe.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: This adjustable impedance device is connected to the circuit under test through two test probes. After being connected, the function of adjustable resistance is realized through a plurality of resistance regulators in the circuit under test, which can meet the needs of the circuit under test for different resistance values, so as to generate the waveform required by the experimenter in the circuit under test. Moreover, in the process of changing the resistance value, there is no need to frequently replace the resistance in the traditional way, no need for frequent soldering, desoldering and re-soldering, and the work efficiency is improved; in addition, the maximum resistance values of the plurality of resistance regulators at least include 10 ohm, 100 ohm, 1 Kohm, 10 Kohm, and 100 Kohm. Different resistance values can be adjusted by the adjustable impedance device through a plurality of resistance regulators with different resistance values, so as to form different resistance value adjustment ranges to adapt to more usage scenarios, which greatly facilitates the use of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the adjustable impedance device according to the embodiment of the present utility model;

[0015] Figure 2 It is a schematic diagram of the structure of the resistance regulator according to the embodiment of the present utility model;

[0016] Figure 3 It is a schematic diagram of the internal structure of the adjustable impedance device according to the embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0018] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0019] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0020] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0021] Figures 1 - 3 It is a schematic diagram of an adjustable impedance device according to an embodiment of the present invention. The adjustable impedance device includes a housing 1, a plurality of resistance regulators 2, and two test probes 3. The plurality of resistance regulators 2 are arranged at intervals on the housing 1, and are connected in series between adjacent two resistance regulators 2. The two test probes 3 are symmetrically installed on the housing 1, and one end of each test probe 3 is electrically connected to the adjacent resistance regulator 2, and the other end is connected to the circuit under test. The adjustable impedance device uses the two test probes 3 to access the circuit under test. After access, the function of adjustable resistance is realized in the circuit under test through the plurality of resistance regulators 2, which can meet the needs of the circuit under test for different resistance values, so as to generate the waveform required by the experimenter in the circuit under test. Moreover, in the process of changing the resistance value, there is no need to frequently replace the resistance in the traditional way, no need for frequent soldering, desoldering and re-soldering, which greatly reduces the damage to the circuit board caused by soldering, and can also save manpower, material resources and time, and well overcomes the deficiencies in the background technology, and the work efficiency is improved. Secondly, this way of adjusting the resistance can also be implemented when the circuit under test is powered on, which greatly improves the convenience of testing and further improves the test efficiency.

[0022] Next, in order to ensure the accuracy of the resistance value of the resistor connected to the circuit under test, a calibration terminal 4 is provided on the housing 1 near the test probe 3. The calibration terminal 4 is electrically connected to the adjacent test probe 3. That is to say, a calibration terminal 4 is connected to each of the two test probes 3. By detecting these two calibration terminals 4, the resistance value at this time can be known, so as to judge whether it is consistent with the resistance value formed by the multiple resistance regulators 2, to ensure the accuracy of the resistance value of the resistor connected to the circuit under test, and it can also promptly detect which resistance regulator 2 is abnormal during use. In addition, if there is already a test resistor in the circuit under test, and the two test probes 3 are connected to both ends of the test resistor at this time, it proves that the resistance formed by the two test probes 3 is connected to the circuit under test in a parallel manner. At this time, the test can be carried out normally. When the waveform output from the circuit under test is stable, finally, the resistance value of the resistance formed by the two test probes 3 actually connected to the circuit under test can be obtained through formula calculation.

[0023] Reference Figure 2 and Figure 3 , as an implementation manner of the adjustable resistor, the resistance regulator 2 includes a potentiometer 201 and an adjustment knob 202. The potentiometer 201 is provided with a plurality of resistance value output terminals, and the resistance value output terminals between adjacent two potentiometers 201 are electrically connected. The adjustment knob 202 is rotatably installed on the potentiometer 201. Among them, the potentiometer 201 is a variable resistor, and it can change the resistance value connected to the circuit by rotating or sliding. The maximum resistance value of the potentiometer 201 connected to the circuit is determined by selecting different resistance value output terminals. For example, if there are three resistance value output terminals on the potentiometer 201, when the maximum resistance value range of the potentiometer 201 needs to be used, the resistance value output terminals at the uppermost and lowermost ends need to be selected to ensure the largest optional resistance value range when the potentiometer 201 is connected to the circuit. In addition, the resistance value output terminals between adjacent two potentiometers 201 are connected by a telescopic wire. The telescopic wire has a double-layer structure, the outer layer is insulated, and the inner layer is a conductive metal such as copper wire. Copper is a relatively soft metal with strong stretchability and is connected between the two potentiometers 201 by changing its shape arbitrarily, which is convenient for the experimenter to use. Secondly, the adjustment knob 202 is also engraved with scales to facilitate the experimenter to view and use.

[0024] To facilitate the adjustment of the resistance value of the adjustable impedance device, the maximum resistance values of the plurality of resistance regulators 2 at least include 10 ohm, 100 ohm, 1 Kohm, 10 Kohm, and 100 Kohm. By using resistance regulators 2 with different resistance values, the adjustable impedance device can adjust different resistance values, forming different resistance value adjustment ranges to adapt to more usage scenarios, which greatly facilitates the use of users. As a preferred implementation manner, the maximum resistance values of the plurality of resistance regulators 2 gradually increase along the direction from left to right, which is convenient for the use of experimenters. In addition, to make the adjustable range of the resistance value of the adjustable impedance device wider, as another preferred implementation manner, there are five resistance regulators 2, and the maximum resistance values of the five resistance regulators 2 are 10 ohm, 100 ohm, 1 Kohm, 10 Kohm, and 100 Kohm in sequence along the direction from left to right.

[0025] Furthermore, in the connection between the test probe 3 and the resistance regulator 2, one end of the test probe 3 is electrically connected to the adjacent resistance regulator 2 through a connecting wire 5. Secondly, to ensure the stability of the test probe 3 after it is connected to the test circuit, a support frame 6 is provided at the other end of the test probe 3, and the support frame 6 can be a tripod, thereby ensuring the stability of the test probe 3 during operation.

[0026] According to the disclosure and teachings of the above specification, those skilled in the art to which the present invention pertains can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. An adjustable impedance device, characterized in that, Comprising: A housing (1); A plurality of resistance regulators (2), which are arranged at intervals on the housing (1), and two adjacent resistance regulators (2) are connected in series; and Two test probes (3), which are symmetrically installed on the housing (1), one end of the test probe (3) is electrically connected to the adjacent resistance regulator (2), and the other end is connected to a circuit under test, wherein, the maximum resistance values of the plurality of resistance regulators (2) at least include 10 ohm, 100 ohm, 1 Kohm, 10 Kohm, 100 Kohm.

2. The adjustable impedance device according to claim 1, wherein A calibration endpoint (4) is arranged on the housing (1) near the test probe (3), and the calibration endpoint (4) is electrically connected to the adjacent test probe (3).

3. The adjustable impedance device according to claim 1, wherein The resistance regulator (2) includes a potentiometer (201) and an adjustment knob (202), the potentiometer (201) is provided with a plurality of resistance value output terminals (203), and the resistance value output terminals (203) on two adjacent potentiometers (201) are electrically connected, and the adjustment knob (202) is rotatably installed on the potentiometer (201).

4. The adjustable impedance device according to claim 3, characterized in that, The resistance value output terminals (203) on two adjacent potentiometers (201) are connected through a telescopic wire (204).

5. The adjustable impedance device according to claim 1, wherein The maximum resistance values of the plurality of resistance regulators (2) gradually increase along the direction from left to right.

6. The adjustable impedance device according to claim 5, wherein There are five resistance regulators (2), and the maximum resistance values of the five resistance regulators are 10 ohm, 100 ohm, 1 Kohm, 10 Kohm, 100 Kohm in sequence along the direction from left to right.

7. The adjustable impedance device according to claim 1, characterized in that One end of the test probe (3) is electrically connected to the adjacent resistance regulator (2) through a connecting wire (5).

8. The adjustable impedance device according to claim 1, wherein It further includes a support frame (6), which is installed on the test probe (3).

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