Device for realizing convenient resistor debugging of signal circuit

Abstract

The utility model provides a device for realizing convenient resistor debugging of a signal circuit, which belongs to the technical field of test tools and comprises a device box body, and a variable resistor module, a resistance AD conversion module, a power supply module and a mode switching module are arranged in the device box body. The variable resistor module comprises a plurality of variable resistors, and the variable resistors are connected in series to form a variable resistor branch; the power supply module and the resistance AD conversion module are connected in series to form a detection branch; the mode switching module is connected with two contact lines, and the two contact lines penetrate out of the device box body and are connected with an external resistor to be adjusted to form an external branch; and the mode switching module performs series-parallel connection switching of the variable resistance branch, the detection branch and the external branch. According to the utility model, real-time resistance adjustment is carried out through the knob, so that signal grabbing is realized, electric soldering iron is not required to be used for dismounting and welding a resistor element, the signal debugging efficiency is improved, the risk that elements around the resistor to be debugged are damaged is reduced, and the cost is reduced to a certain extent.

Description

Technical Field

[0001] The utility model belongs to the technical field of test tooling, and particularly relates to a device for conveniently debugging resistors in a signal circuit. Background Technique

[0002] During the server design verification stage, various low-speed and high-speed signals in the server motherboard need to be measured. When signals are transmitted between chips in the server motherboard, problems such as signal distortion, timing offset, voltage noise, and reflection often occur. The quality of the signals received by the chips cannot be guaranteed, ultimately affecting the reliability of communication between chips and even the performance of the server motherboard. Therefore, appropriate signal optimization schemes need to be adopted to ensure the integrity of the signals transmitted between chips. Commonly used signal optimization schemes include selecting appropriate signal lines, impedance adjustment, wiring planning, and signal layer separation. Among them, the most convenient way during the server design verification stage is impedance adjustment.

[0003] During the process of using impedance adjustment for signal debugging, generally, a single resistor modification cannot complete signal optimization. Usually, multiple resistor adjustments are required, which means using a soldering iron to disassemble and solder the resistor at the same position multiple times. This process is time-consuming and laborious. More importantly, multiple operations will also damage the solder pads under the components, resulting in the inability to replace the components anymore, greatly hindering the smooth progress of the signal debugging process and leading to extremely low overall test efficiency. In addition, there is a risk of damaging surrounding electronic components due to improper operation of the soldering iron during the continuous disassembly and soldering of the resistor, which will increase unnecessary test costs.

[0004] In view of the above defects, it is very necessary to provide a device for conveniently debugging resistors in a signal circuit. Summary of the Invention

[0005] In view of the defects that when signals are transmitted between chips in the above-mentioned server motherboard, the signal quality cannot be guaranteed, signal optimization is required, the commonly used impedance adjustment method requires multiple resistor modifications, repeatedly disassembling the resistor with a soldering iron will damage the circuit board and surrounding electronic components, and the efficiency is low, the utility model provides a device for conveniently debugging resistors in a signal circuit to solve the above technical problems.

[0006] The utility model provides a device for conveniently debugging resistors in a signal circuit, which includes a device box body. Inside the device box body, there are a variable resistor module, a resistance value AD conversion module, a power supply module, and a mode switching module; the variable resistor module includes several variable resistors, and each variable resistor is connected in series to form a variable resistance branch.

[0007] The power supply module is connected in series with the resistance value AD conversion module to form a detection branch.

[0008] The mode switching module is connected with two contact wires, and the two contact wires pass through the device box body and are connected with the external resistor to be adjusted to form an external branch circuit;

[0009] The mode switching module performs series and parallel switching of the variable resistance branch circuit, the detection branch circuit and the external branch circuit.

[0010] Further, the mode switching module includes a first switch K1, a second switch K2, a contact point A, a contact point B, a contact point C and a contact point D;

[0011] The first switch K1 includes a fixed end, a normally closed end and a normally open end;

[0012] The fixed end of the first switch K1 is arranged at the contact point A, the normally closed end of the first switch K1 is arranged at the contact point B, and the normally open end of the first switch K1 is arranged at the contact point C;

[0013] The second switch K2 includes a fixed end and a movable end;

[0014] The fixed end of the second switch K2 is arranged at the contact point C, and the movable end of the second switch K2 is arranged at the contact point D; the contact point B is connected to the first end of the detection branch circuit and the first end of the variable resistance branch circuit, the contact point C is connected to the second end of the detection branch circuit, the contact point A is connected to the first end of the detection branch circuit, and the contact point D is connected to the second end of the detection branch circuit and the second end of the variable resistance branch circuit. Further, each variable resistor is connected with a resistance value adjusting knob, and the mode switching module is connected with a mode switching button. The mode switching button and each resistance value adjusting knob are arranged outside the device box body;

[0015] A power switch S1 is further arranged on the detection branch circuit, and the power switch S1 is arranged outside the device box body.

[0016] Further, the resistor Rs to be adjusted is further arranged on the external signal line. One end of the external signal line is connected with a first chip, and the other end is connected with a second chip.

[0017] Further, the power supply module adopts a battery BT.

[0018] Further, the resistance value AD conversion module includes an analog-to-digital conversion chip U1 with a display driver;

[0019] The analog-to-digital conversion chip U1 with a display driver is provided with a display driver pin group An, an input pin IN, an output pin OUT, a positive power supply pin V+ and a negative power supply pin V-;

[0020] The battery BT is connected with a charge pump circuit. The positive power supply pin V+ is connected with the positive electrode of the battery BT, and the negative power supply pin V- is connected with the charge pump circuit;

[0021] The input pin IN and the output pin OUT connect the analog-to-digital conversion chip U1 with display drive to the detection branch; the display drive pin group An is connected to an LCD display screen, and the LCD display screen penetrates through the device box body and is arranged on the surface of the device box body.

[0022] Furthermore, the analog-to-digital conversion chip U1 with display drive adopts a chip of model ICL7106 or ICL7107.

[0023] Furthermore, an contact wire adjustment knob is also arranged outside the device box body;

[0024] The contact B or the contact C adopts a strip-shaped contact;

[0025] The contact wire connected to the strip-shaped contact is an adjustable contact wire, and the adjustable contact wire is connected to the contact wire adjustment knob through a contact wire adjustment mechanism;

[0026] The contact wire adjustment mechanism includes a fixing plate, a gear and a rack;

[0027] A sliding groove is arranged on the fixing plate, the central axis of the gear is arranged on the fixing plate, the rack is arranged in the sliding groove and is meshed with the gear;

[0028] One end of the rack is provided with a sliding rod, and the sliding rod penetrates through the rack and is perpendicular to the rack;

[0029] The central axis of the gear penetrates through the device box body, and the contact wire adjustment knob is arranged at the central axis of the gear;

[0030] The adjustable contact wire penetrates through the sliding rod, one end of the adjustable contact wire is connected to the strip-shaped contact, the other end of the adjustable contact wire is connected to the resistor Rs to be adjusted, and it moves along the strip-shaped contact as the rack moves, so as to adjust the distance between the two contact wires.

[0031] Furthermore, the number of variable resistors is three, including a first variable resistor Rx1, a second variable resistor Rx2 and a third variable resistor Rx3;

[0032] The resistance adjustment range of the first variable resistor Rx1 is 0 - 100Ω, the resistance adjustment range of the second variable resistor Rx2 is 0 - 1kΩ, and the resistance adjustment range of the third variable resistor Rx3 is 0 - 10kΩ.

[0033] Furthermore, each variable resistor is connected to a corresponding resistance value adjustment knob through a resistance adjustment mechanism;

[0034] The resistance adjustment mechanism has the same structure as the contact wire adjustment mechanism.

[0035] The beneficial effects of the present utility model are as follows:

[0036] The device for realizing convenient debugging of resistors in a signal circuit provided by the present utility model adjusts the real-time resistance through a knob. While realizing signal capture, it is not necessary to use a soldering iron to remove and weld resistor components, improving the efficiency of signal debugging. At the same time, it also reduces the risk of damage to the components around the resistor to be debugged, and reduces the cost to a certain extent.

[0037] In addition, the design principle of the present utility model is reliable and the structure is simple, having a very broad application prospect. Thus, compared with the prior art, the present utility model has substantial features and progress, and the beneficial effects of its implementation are also obvious. Brief Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 It is a schematic diagram of the internal circuit of the device for realizing convenient debugging of resistors in a signal circuit of the present utility model.

[0040] Figure 2 It is a schematic diagram of the external structure of the box body of the device for realizing convenient debugging of resistors in a signal circuit of the present utility model.

[0041] Figure 3 It is an application schematic diagram of the device for realizing convenient debugging of resistors in a signal circuit of the present utility model.

[0042] Figure 4 It is a schematic diagram of the circuit connection of the analog-to-digital conversion chip with display drive in the present utility model.

[0043] Figure 5 It is a schematic diagram of the structure of the contact wire adjustment mechanism in the present utility model.

[0044] Figure 6 It is a schematic diagram of the equivalent circuit of the parallel mode of the present utility model.

[0045] Figure 7 It is a schematic diagram of the equivalent circuit of the series mode of the present utility model.

[0046] Main Reference Numeral Description

[0047] 1. Device box body, 2. Resistance AD conversion module, 3. Mode switching button, 4. First chip, 5. Second chip, 6. LCD display screen, 7. Charge pump circuit, 8. Contact wire adjustment knob, 10. Fixed plate, 11. Gear, 12. Rack, 13. Slide bar, 14. First resistance adjustment knob, 15. Second resistance adjustment knob, 16. Third resistance adjustment knob. Detailed implementation

[0048] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0049] Embodiment 1:

[0050] Please refer to Figure 1 and Figure 2 Shown is a device for conveniently debugging resistors in a signal circuit in a specific implementation, including a device box body 1. Inside the device box body 1, there are a variable resistor module, a resistance AD conversion module 2, a power supply module, and a mode switching module;

[0051] The variable resistor module includes several variable resistors, and each variable resistor is connected in series to form a variable resistance branch;

[0052] The power supply module is connected in series with the resistance AD conversion module 2 to form a detection branch;

[0053] The mode switching module is connected with two contact wires L. The two contact wires L pass through the device box body and are connected to the external resistor to be adjusted to form an external branch;

[0054] The mode switching module performs series-parallel switching of the variable resistance branch, the detection branch, and the external branch.

[0055] Embodiment 2:

[0056] In Embodiment 1, as Figure 3 shown, the resistor Rs to be adjusted is also provided on the external signal line. One end of the external signal line is connected to the first chip 4, and the other end is connected to the second chip 5;

[0057] The mode switching module includes a first switch K1, a second switch K2, a contact point A, a contact point B, a contact point C, and a contact point D;

[0058] The first switch K1 includes a fixed end, a normally closed end, and a normally open end;

[0059] The fixed terminal of the first switch K1 is set at contact point A, the normally closed terminal of the first switch K1 is set at contact point B, and the normally open terminal of the first switch K1 is set at contact point C;

[0060] The second switch K2 includes a fixed terminal and a movable terminal;

[0061] The fixed terminal of the second switch K2 is set at contact point C, and the movable terminal of the second switch K2 is set at contact point D; Contact point B is connected to the first end of the detection branch and the first end of the variable resistance branch, and contact point C is connected to the second end of the detection branch; Each variable resistor is connected with a resistance value adjustment knob, and the mode switching module is connected with a mode switching button 3, and the mode switching button 3 and each resistance value adjustment knob are all arranged outside the device box body 1;

[0062] A power switch S1 is also arranged on the detection branch, and the power switch S1 is arranged outside the device box body 1;

[0063] The power switch S1 controls the working state of the device box body 1 to be open or closed;

[0064] The power module uses a battery BT;

[0065] As Figure 4 shown, the resistance value AD conversion module includes an analog-to-digital conversion chip U1 with display drive; The analog-to-digital conversion chip U1 with display drive uses a chip of model ICL7106 or ICL7107;

[0066] The analog-to-digital conversion chip U1 with display drive is provided with a display drive pin group An, an input pin IN, an output pin OUT, a positive power supply pin V+ and a negative power supply pin V-;

[0067] The battery BT is connected with a charge pump circuit 7, the positive power supply pin V- is connected to the positive electrode of the battery BT, and the negative power supply pin V- is connected to the charge pump circuit 7;

[0068] The input pin IN and the output pin OUT connect the analog-to-digital conversion chip U1 with display drive to the detection branch; The display drive pin group An is connected with an LCD display screen 6, and the LCD display screen 6 penetrates through the device box body 1 and is arranged on the surface of the device box body 1;

[0069] A contact wire adjustment knob 8 is also arranged outside the device box body 1;

[0070] The number of variable resistors is three, including a first variable resistor Rx1, a second variable resistor Rx2 and a third variable resistor Rx3;

[0071] The resistance adjustment range of the first variable resistor Rx1 is 0 - 100Ω, the resistance adjustment range of the second variable resistor Rx2 is 0 - 1kΩ, and the resistance adjustment range of the third variable resistor Rx3 is 0 - 10kΩ;

[0072] The first variable resistor Rx1 corresponds to the first resistance value adjustment knob 14, the second variable resistor Rx2 corresponds to the second resistance value adjustment knob 15, and the third variable resistor Rx3 corresponds to the third resistance value adjustment knob 16;

[0073] The three resistance value adjustment knobs can adjust the resistance value of the variable resistor within the range of 0 to 11.1 KΩ. The adjustment range is related to the resistance value of the selected variable resistor. The first resistance value adjustment knob 14 can be continuously adjusted within the range of 0 to 100 Ω, the second resistance value adjustment knob 15 can be continuously adjusted within the range of 0 to 1 KΩ, and the third resistance value adjustment knob 16 can be continuously adjusted within the range of 0 to 10 KΩ. Rotating in the clockwise direction increases the resistance value of the variable resistor;

[0074] The mode switching button 3 can select two working modes. One is Figure 6 the parallel mode shown in Figure 7 which is suitable for reducing the resistance value of the signal circuit; the other is

[0075] the series mode shown in 并 which is suitable for increasing the resistance value of the signal circuit; In the parallel mode, the resistor to be adjusted Rs is connected in parallel with the first variable resistor Rx1, the second variable resistor Rx2, and the third variable resistor Rx3. According to the rules of the parallel circuit, the total parallel resistance R

[0076] is calculated by the following formula, 串 The total resistance R of the parallel circuit is smaller than the resistance value of any parallel branch resistor. By adjusting the resistance value of the variable resistor, a total parallel resistance smaller than Rs can be obtained; 串 In the series mode, the resistor to be adjusted Rs is connected in series with the first variable resistor Rx1, the second variable resistor Rx2, and the third variable resistor Rx3. According to the rules of the series resistor, the total series resistance R

[0077] is calculated by the following formula: R series = Rs + Rx1 + Rx2 + Rx3. The total resistance R of the series circuit

[0078] is larger than the resistance value of any series resistor. By adjusting the resistance value of the variable resistor, a total series resistance larger than Rs can be obtained;

[0079] Through these two circuits, the device box can reduce or increase the resistance in the signal circuit, and the resistance debugging can be achieved without using a soldering iron to remove and weld the resistance components;

[0080] In some embodiments, the contact B or the contact C is a strip-shaped contact;

[0081] The contact line connected to the strip-shaped contact point is an adjustable contact line, and the adjustable contact line is connected to the contact line adjustment knob 8 through a contact line adjustment mechanism;

[0082] The contact line adjustment knob 8 can adjust the distance between the two contact lines within a certain range to ensure close contact with the resistor to be adjusted Rs, freeing the tester's hands;

[0083] The outside of the device box body 1 is used to place the resistance adjustment knob, the power switch S1, the mode switching button 3 and the LCD display screen 6, and the inside is used to place the PCB board.

[0084] like Figure 5 As shown, the contact line adjustment mechanism includes a fixing plate 10, a gear 11 and a rack 12;

[0085] A slide groove is provided on the fixed plate 10, the central axis of the gear 11 is provided on the fixed plate 10, the rack 12 is provided in the slide groove and meshedly connected with the gear 11;

[0086] A slide bar 13 is provided at one end of the rack 12, and the slide bar 13 passes through the rack and is perpendicular to the rack 12;

[0087] The central axis of the gear 11 passes through the device box body 1, and the contact line adjustment knob 8 is arranged at the central axis of the gear 11;

[0088] The adjustable contact line passes through the slide bar 13, one end of the adjustable contact line is connected to the strip-shaped contact point, and the other end of the adjustable contact line is connected to the resistor to be adjusted Rs, and moves along the strip-shaped contact point as the rack 12 moves, thereby adjusting the distance between the two contact lines L;

[0089] Each variable resistor is connected to a corresponding resistance adjustment knob through a resistance adjustment mechanism;

[0090] The resistance adjustment mechanism has the same structure as the contact line adjustment mechanism.

[0091] The use process of the device for conveniently debugging resistance of the signal circuit of the utility model is as follows:

[0092] Determine the resistance Rs to be adjusted: in a signal circuit between the first chip 4 and the second chip 5, find the resistance Rs to be adjusted through the schematic diagram and record the resistance value;

[0093] Hardware connection: Figure 3 As shown, the two sets of contact wires L of the device box body 1 are contacted with the original resistor Rs to be adjusted, and the contact wire adjustment knob 8 is rotated to ensure a tight connection. At this point, the hardware part is connected, and there is no need to disassemble and weld with a soldering iron throughout the process;

[0094] Working mode selection: Determine the mode of the resistance debugging tool according to the signal quality. If it is necessary to increase the resistance, select the parallel mode; if it is necessary to decrease the resistance, select the series mode.

[0095] Resistance value debugging: Rotate the resistance adjustment knob. The adjusted resistance should have the same order of magnitude as the resistance Rs to be adjusted. Therefore, the variable resistance with the same order of magnitude as the resistance to be adjusted can be adjusted first. Use the oscilloscope and probe to detect the result of signal debugging in real time. If the requirements are not met, rotate the resistance adjustment knob again until the signal meets the requirements. Record the value on the LCD display screen at this time, and this value is the finally optimized resistance value.

[0096] Taking the RGMII signal as an example, when the BMC chip and the Phy chip are communicating, crosstalk, noise, overshoot and other phenomena often occur in the RGMII Rx Data and RGMII TXData signals, resulting in failure to meet the requirements of the input end of the BMC chip or the Phy chip. At this time, it is necessary to find the resistance Rs to be adjusted between the Phy chip and the BMC chip, and use the device box body 1 of the present application for signal debugging; if the RGMII Rx Data has overshoot and the overshoot time is greater than 8nS and cannot meet the requirements of the input end of the BMC chip, it is necessary to increase the resistance. The following is the specific operation method:

[0097] Determine the resistance Rs to be debugged: Find the resistance Rs to be debugged through the schematic diagram, and record the resistance value as 33Ω; Hardware connection: Connect the two contact wires L of the device box body 1 to the resistance Rs to be debugged, and rotate the contact wire adjustment knob 8 to ensure that the contact wire L is tightly connected to the resistance Rs to be adjusted.

[0098] Working mode selection: According to the above description, it is necessary to increase the resistance to reduce the signal overshoot time, so select the parallel mode.

[0099] Resistance value debugging: Turn on the power switch S1, rotate the first resistance adjustment knob 14, the reading on the LCD display screen 6 is 40Ω, use the oscilloscope and probe to observe the change of the Data signal in real time, and read the Data overshoot time, which does not meet the requirements.

[0100] Continue to rotate the first resistance adjustment knob 14, the reading on the LCD display screen 6 is 50Ω, use the oscilloscope and probe to observe the change of the Data signal in real time, and read the Data overshoot time. The signal overshoot time meets the requirements. Record the value 50Ω on the LCD display screen 6 at this time. This value is the finally optimized resistance value, and the signal debugging ends here.

[0101] Although the present utility model has been described in detail by referring to the accompanying drawings and in conjunction with the preferred embodiments, the present utility model is not limited thereto. Without departing from the spirit and essence of the present utility model, those of ordinary skill in the art can make various equivalent modifications or substitutions to the embodiments of the present utility model, and all such modifications or substitutions should be within the scope covered by the present utility model / Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present utility model, and all should be covered within the protection scope of the present utility model.

Claims

1. A device for conveniently debugging resistance in a signal circuit, characterized in that: The device comprises a device box body, wherein a variable resistance module, a resistance AD ​​conversion module, a power supply module and a mode switching module are arranged inside the device box body; the variable resistance module comprises a plurality of variable resistors, and the variable resistors are connected in series to form a variable resistance branch; The power module is connected in series with the resistance AD ​​conversion module to form a detection branch; The mode switching module is connected with two contact wires, which pass through the device box and are connected with the external resistor to be adjusted to form an external branch circuit; The mode switching module performs series-parallel switching of the variable resistance branch, the detection branch and the external branch.

2. The device for realizing convenient debugging of resistance in a signal circuit according to claim 1, characterized in that: The mode switching module includes a first switch K1, a second switch K2, a contact A, a contact B, a contact C and a contact D; the first switch K1 includes a fixed end, a normally closed end and a normally open end; The fixed end of the first switch K1 is set at contact A, the normally closed end of the first switch K1 is set at contact B, and the normally open end of the first switch K1 is set at contact C; The second switch K2 includes a fixed end and a movable end; The fixed end of the second switch K2 is arranged at the contact point C, and the movable end of the second switch K2 is arranged at the contact point D; Contact B connects the first end of the detection branch and the first end of the variable resistance branch, contact C connects the second end of the detection branch, contact A connects the first end of the detection branch, and contact D connects the second end of the detection branch and the second end of the variable resistance branch.

3. The device for realizing convenient debugging of resistance in a signal circuit according to claim 2, characterized in that: Each variable resistor is connected to a resistance adjustment knob, the mode switching module is connected to a mode switching button, and the mode switching button and each resistance adjustment knob are arranged outside the device box body; The detection branch is also provided with a power switch S1, which is arranged outside the device box.

4. The device for realizing convenient debugging of resistance in a signal circuit according to claim 1, characterized in that: The resistor Rs to be adjusted is also arranged on the external signal line, one end of the external signal line is connected to the first chip, and the other end of the external signal line is connected to the second chip.

5. The device for realizing convenient debugging of resistance in a signal circuit according to claim 1, characterized in that: The power module uses battery BT.

6. The device for realizing convenient debugging of resistance in a signal circuit as claimed in claim 5, characterized in that: The resistance AD ​​conversion module includes an analog-to-digital conversion chip U1 with display driver; The analog-to-digital conversion chip U1 with display driver is provided with a display driver pin group An, an input pin IN, an output pin OUT, a positive power pin V+ and a negative power pin V-; The battery BT is connected to a charge pump circuit, the positive power pin V- is connected to the positive electrode of the battery BT, and the negative power pin V- is connected to the charge pump circuit; The input pin IN and the output pin OUT connect the analog-to-digital conversion chip U1 with display driver to the detection branch; the display driver pin group An is connected to an LCD display screen, which runs through the device box body and is arranged on the surface of the device box body.

7. The device for realizing convenient debugging of resistance in a signal circuit according to claim 6, characterized in that: The analog-to-digital conversion chip U1 with display driver adopts the chip of ICL7106 or ICL7107.

8. The device for realizing convenient debugging of resistance in a signal circuit as claimed in claim 3, characterized in that: A contact line adjustment knob is also provided on the outside of the device box; Contact B or contact C adopts a strip-shaped contact; The contact wire connected to the strip-shaped contact point is an adjustable contact wire, and the adjustable contact wire is connected to the contact wire adjustment knob through a contact wire adjustment mechanism; The contact line adjustment mechanism includes a fixed plate, a gear and a rack; A slide groove is arranged on the fixed plate, the central axis of the gear is arranged on the fixed plate, the rack is arranged in the slide groove and meshedly connected with the gear; A slide bar is provided at one end of the rack, and the slide bar passes through the rack and is perpendicular to the rack; The central axis of the gear passes through the device box body, and the contact line adjustment knob is arranged at the central axis of the gear; The adjustable contact line runs through the slide bar, one end of the adjustable contact line is connected to the strip-shaped contact point, and the other end of the adjustable contact line is connected to the resistor Rs to be adjusted, and moves along the strip-shaped contact point with the movement of the rack, thereby adjusting the distance between the two contact lines.

9. The device for realizing convenient debugging of resistance in a signal circuit as claimed in claim 3, characterized in that: The number of variable resistors is three, including a first variable resistor Rx1, a second variable resistor Rx2 and a third variable resistor Rx3; The resistance adjustment range of the first variable resistor Rx1 is 0-100Ω, the resistance adjustment range of the second variable resistor Rx2 is 0-1kΩ, and the resistance adjustment range of the third variable resistor Rx3 is 0-10kΩ.

10. The device for realizing convenient debugging of resistance in a signal circuit according to claim 9, characterized in that: Each variable resistor is connected to a corresponding resistance adjustment knob through a resistance adjustment mechanism; The resistance adjustment mechanism has the same structure as the contact line adjustment mechanism.

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