Connecting circuit applied to analyzer and analysis system

Abstract

The utility model discloses a connecting circuit applied to an analyzer and an analysis system. The connecting circuit comprises a digital multimeter, a matching unit and a high voltage dividing unit, the input end of the high-voltage voltage dividing unit is externally connected with an analyzer and is used for acquiring a high-voltage signal received by the analyzer and converting the high-voltage signal into a low-voltage signal; a high potential input end of the digital multimeter is respectively connected with an output signal end of the high voltage dividing unit and a signal end of the matching unit, a low potential input end of the digital multimeter is respectively connected with an output grounding end of the high voltage dividing unit and a grounding end of the matching unit, and the grounding end of the matching unit is grounded; the digital multimeter is in communication connection with the electronic equipment; and the digital multimeter is used for measuring the low-voltage signal and sending a measurement result to the electronic equipment. According to the utility model, the matching unit between the high-voltage dividing unit and the digital multimeter is utilized, so that the problem that the impedance between the output end of the high-voltage dividing unit and the input end of the digital multimeter is not matched is solved, and the accuracy and the reliability of the calibration of the analyzer are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit design technical field especially, it relates to a kind of connecting circuit and analysis system applied to analyser. BACKGROUND

[0002] The analyser with defibrillator and / or transcutaneous pacemaker analysis function is the instrument indispensable to calibrate defibrillator and / or transcutaneous pacemaker.

[0003] In prior art, since defibrillator and / or transcutaneous pacemaker can output high-energy pulse current, its voltage is high-voltage, thus cannot directly use instrument such as digital multimeter to calibrate analyser with defibrillator and / or transcutaneous pacemaker analysis function. Thus, generally, instrument with high-voltage voltage division function is used to divide voltage after high-voltage, and then digital multimeter is used to calibrate analyser.

[0004] However, since the precision range and use range of digital multimeter and instrument with high-voltage voltage division function can exist mismatching condition, thus, in the process of calibrating analyser using digital multimeter, there is the problem of large calibration error caused by impedance mismatching between digital multimeter and instrument with high-voltage voltage division function. SUMMARY

[0005] The utility model provides a kind of connecting circuit and analysis system applied to analyser, utilize the matching unit between high-voltage voltage division unit and digital multimeter, solve the problem that there is impedance mismatching between the output end of high-voltage voltage division unit and the input end of digital multimeter, can lead to large error in the calibration process of analyser, improve the accuracy and reliability of analyser calibration process.

[0006] According to an aspect of the utility model, a kind of connecting circuit applied to analyser includes: digital multimeter, matching unit and high-voltage voltage division unit;Wherein,

[0007] the input end of high-voltage voltage division unit is connected with analyser, for collecting high-voltage signal received by analyser, and high-voltage signal is converted into low-voltage signal;

[0008] the high potential input end of digital multimeter is connected with the output signal end of high-voltage voltage division unit, the signal end of matching unit respectively, the low potential input end of digital multimeter is connected with the output ground terminal of high-voltage voltage division unit, the ground terminal of matching unit respectively, the ground terminal of matching unit is grounded;Digital multimeter is connected with electronic equipment in communication;

[0009] digital multimeter, for measuring low-voltage signal, and measurement result is sent to electronic equipment.

[0010] The utility model provides a kind of connection circuit applied to analyser, comprising: digital multimeter, matching unit and high voltage voltage division unit.Outside, the input end of high voltage voltage division unit is connected analyser, for the high voltage signal received by analyser acquisition, and high voltage signal is converted into low voltage signal;The high potential input end of digital multimeter is connected with the output signal end of high voltage voltage division unit, the signal end of matching unit respectively, the low potential input end of digital multimeter is connected with the output ground terminal of high voltage voltage division unit, the ground terminal of matching unit respectively, the ground terminal of matching unit is grounded;Digital multimeter is connected with electronic equipment communication;Digital multimeter is used to measure low voltage signal, and measurement result is sent to electronic equipment.The above-mentioned technique, on the one hand, the combination of digital multimeter and high voltage voltage division unit is used, measurement in the process of analyzing calibration to analyser with cardiac defibrillator / transcutaneous pacemaker function is realized, compared with directly using oscilloscope or oscilloscope board card to measure, based on using simple and low cost digital multimeter, the cost of the analysis calibration of analyser is lower.Another aspect, using matching unit between high voltage voltage division unit and digital multimeter, the problem that there is impedance mismatching between the output end of high voltage voltage division unit and the input end of digital multimeter, and it can cause large error in the calibration process of analyser is solved, based on matching unit, the impedance matching of the output end of high voltage voltage division unit and the input end of digital multimeter is realized, and the accuracy and reliability of analyser calibration process are improved.

[0011] Optionally, the matching unit includes a matching circuit and an interface; one end of the matching circuit is connected with a signal end of the interface, and the other end of the matching circuit is connected with a ground end of the interface.

[0012] Optionally, the interface is a BNC interface or a terminal post.

[0013] Optionally, the matching circuit includes a first branch and a second branch; one end of the first branch and one end of the second branch are connected with the signal end of the interface; the other end of the first branch and the other end of the second branch are connected with the ground end of the interface.

[0014] Optionally, when the internal resistance of the digital multimeter is greater than 10 GΩ, the resistance value of the first branch is 1 MΩ; when the internal resistance of the digital multimeter is 10 MΩ, the resistance value of the first branch is 1.111 MΩ.

[0015] Optionally, when the resistance value of the first branch is 1.111 MΩ, the first branch includes a first resistor, a second resistor and a third resistor connected in series; the resistance value of the first resistor is 1 MΩ, the resistance value of the second resistor is 110 kΩ, and the resistance value of the third resistor is 1.1 kΩ.

[0016] Optionally, when the resistance value of the first branch is 1 MΩ, the first branch includes a fourth resistor; the resistance value of the fourth resistor is 1 MΩ.

[0017] Optionally, the second branch includes a first capacitor, a second capacitor and a third capacitor connected in parallel; the capacitance of the first capacitor, the second capacitor and the third capacitor is 20 pico farad; or the capacitance of the first capacitor and the second capacitor is 5 pico farad, and the capacitance of the third capacitor is 4 pico farad.

[0018] Optionally, the second branch includes a fourth capacitor, a fifth capacitor and a sixth capacitor, wherein the fourth capacitor and the fifth capacitor are connected in series and then connected in parallel with the sixth capacitor; the capacitance of the fourth capacitor and the fifth capacitor is 18 pico farad, and the capacitance of the sixth capacitor is 20 pico farad.

[0019] According to another aspect of the present application, an analysis system is provided, which comprises the connection circuit applied to the analyzer according to any one of the embodiments of the present application, and the analyzer and the electronic device; the high-voltage voltage dividing unit of the connection circuit applied to the analyzer is electrically connected with the analyzer, and the connection circuit applied to the analyzer and the electronic device are in communication through a serial port.

[0020] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0022] Figure 1 A structural schematic diagram of the connection circuit applied to the analyzer according to the present application is provided;

[0023] Figure 2 A structural schematic diagram of the matching unit according to the present application is provided;

[0024] Figure 3 A circuit example diagram of the first branch according to the embodiment of the present application is provided;

[0025] Figure 4 Another circuit example diagram of the first branch according to the embodiment of the present application is provided;

[0026] Figure 5 A circuit example diagram of the second branch according to the embodiment of the present application is provided;

[0027] Figure 6Another circuit example diagram of the second branch provided for the embodiment of the present application;

[0028] Figure 7 A structural schematic diagram of an analysis system provided by the present application;

[0029] Reference signs:

[0030] 01-connection circuit applied to an analyzer; 10-digital multimeter; 20-high voltage dividing unit; 30-matching unit; int1-input end of the high voltage dividing unit; 301-matching circuit; 302-interface; 3011-first branch; 3012-second branch; R1-first resistor; R2-second resistor; R3-third resistor; R4-fourth resistor; C1-first capacitor; C2-second capacitor; C3-third capacitor; C4-fourth capacitor; C5-fifth resistor; C6-sixth resistor; A-analyzer; B-electronic device; S-signal end; G-ground end. DETAILED DESCRIPTION

[0031] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0032] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0033] Figure 1 A structural schematic diagram of a connection circuit applied to an analyzer provided by the present application. As shown in Figure 1 the connection circuit applied to the analyzer includes a digital multimeter 10, a high voltage dividing unit 20 and a matching unit 30. Among them, the high voltage dividing unit 20 is used to refer to the equipment and instrument with high voltage dividing function.

[0034] Specifically, the input terminal int1 of the high-voltage divider unit 20 is connected to an external analyzer to acquire the high-voltage signal received by the analyzer and convert it into a low-voltage signal. The high-voltage divider unit 20 has two input terminals (int1), and the analyzer also has two input terminals. Connecting the two input terminals of the high-voltage divider unit 20 (int1) to the two input terminals of the analyzer via external wiring establishes the connection between the high-voltage divider unit and the analyzer.

[0035] For example, during the calibration of the analyzer, a high-voltage divider unit is connected to the analyzer, and the two input interfaces of the analyzer are also connected to a defibrillator / transcutaneous pacemaker. Thus, when the defibrillator / transcutaneous pacemaker outputs a high-energy pulse to the analyzer, upon receiving the pulse, the high-voltage divider unit connected to the analyzer synchronously acquires the high-voltage signal of the received pulse and converts the high-voltage signal into a low-voltage signal using a voltage divider method.

[0036] Specifically, the high-potential input terminal of the digital multimeter 10 is connected to the output signal terminal of the high-voltage divider unit 20 and the signal terminal of the matching unit 30, respectively. The low-potential input terminal of the digital multimeter 10 is connected to the output ground terminal of the high-voltage divider unit 20 and the ground terminal of the matching unit 30, respectively. The ground terminal of the matching unit 30 is grounded, and the digital multimeter 10 is communicatively connected to the electronic equipment. The digital multimeter 10 is used to measure low-voltage signals and send the measurement results to the electronic equipment.

[0037] Among them, such as Figure 1 In the diagram, "S" is the signal terminal, and "G" is the ground terminal (GND). It is worth noting that "S" and "G" have the same meaning in the following diagrams, and will not be repeated hereafter.

[0038] For example, because the input of the digital multimeter is impedance mismatched with the output of the high-voltage divider unit, a matching unit needs to be connected in parallel with the input of the digital multimeter to match the impedance of the output of the high-voltage divider unit with that of the digital multimeter. Thus, after the high-voltage divider unit converts the high-voltage signal into a low-voltage signal, the low-voltage signal, before entering the digital multimeter, is impedance-matched and measurable by the matching unit. This low-voltage signal is then measured by the digital multimeter to obtain standard pulse data of the defibrillator / percutaneous pacemaker acting on the analyzer. This standard pulse data provides a standard data basis for subsequent calibration of the analyzer's analysis results. Furthermore, after the digital multimeter measures a successfully impedance-matched low-voltage signal, the measurement result (standard pulse data) can be sent to an electronic device, which calculates the standard pulse result based on the measurement result.

[0039] Optionally, after the defibrillator / transcutaneous pacemaker outputs a high-energy pulse to the analyzer, the analyzer can determine actual pulse data directly according to the pulse signal, or can also calculate actual pulse results according to the actual pulse data. At this time, the analyzer sends the actual pulse data or the actual pulse results to the electronic device through the communication mode, and then the electronic device determines the calibration result of the analyzer according to the standard pulse results and the actual pulse results.

[0040] The utility model provides a kind of connection circuit applied to analyzer, comprising: digital multimeter, matching unit and high voltage voltage division unit. Wherein, the input end of high voltage voltage division unit is externally connected analyzer, for collecting the high voltage signal received by analyzer, and high voltage signal is converted into low voltage signal;The high potential input end of digital multimeter is connected with the output signal end of high voltage voltage division unit, the signal end of matching unit respectively, the low potential input end of digital multimeter is connected with the output ground terminal of high voltage voltage division unit, the ground terminal of matching unit respectively, and the ground terminal of matching unit is grounded;Digital multimeter is communicatively connected with electronic device;Digital multimeter is used to measure low voltage signal, and measurement result is sent to electronic device. In the above-mentioned technology, on the one hand, the combination of digital multimeter and high voltage voltage division unit is used to measure during the analysis and calibration of the analyzer with the function of defibrillator / transcutaneous pacemaker, which is more cost-effective than using oscilloscope or oscilloscope board directly. On the other hand, the matching unit between high voltage voltage division unit and digital multimeter solves the problem of impedance mismatch between the output end of high voltage voltage division unit and the input end of digital multimeter, which can cause large errors in the calibration process of the analyzer. The matching unit matches the impedance between the output end of high voltage voltage division unit and the input end of digital multimeter, improving the accuracy and reliability of the calibration process of the analyzer.

[0041] Optionally, Figure 2 The matching unit provided by the utility model is shown in the structure diagram. The matching unit 30 includes matching circuit 301 and interface 302. Wherein, one end of matching circuit 301 and the signal end of interface 302 are connected, and the other end of matching circuit 301 and the ground end of interface 302 are connected.

[0042] Optionally, the interface 302 is a BNC interface or a terminal post. Wherein, the BNC interface is a kind of radio frequency coaxial cable connector. It is composed of center needle, insulator, metal shell and bayonet, and connection or disconnection operation can be completed by rotating a quarter of a circle. The terminal post is an interface component used for connecting external signal or power supply in electronic measuring instrument.

[0043] Exemplarily, when the interface is a BNC interface, the BNC interface is a male interface. The center pin is a "signal end", and the metal shell and the bayonet are "ground ends".

[0044] Exemplarily, when the interface is a BNC interface,

[0045] The high potential input end of the digital multimeter is connected with the first banana plug of the first adapter, and the low potential input end is connected with the second banana plug of the first adapter. The BNC female port of the first adapter is connected with the output end of the high-voltage voltage dividing unit, that is, the output signal end and the output ground end. The second BNC female port of the second adapter is connected with the BNC male port of the matching unit. The ground end of the matching unit is grounded.

[0046] Exemplarily, when the interface is a terminal post,

[0047] The high potential input end of the digital multimeter is connected with the first banana plug of the first adapter, and the low potential input end is connected with the second banana plug of the first adapter. The BNC female port of the first adapter is connected with the output end of the high-voltage voltage dividing unit. The first jack of the first adapter is connected with the terminal post signal end of the matching unit, and the second jack of the first adapter is connected with the terminal post ground end of the matching unit. The ground end of the matching unit is grounded.

[0048] In the above, the first adapter is a double-row banana plug adapter BNC female port adapter. The second adapter is a three-way adapter. The output end of the high-voltage voltage dividing unit is a BNC male port. In this embodiment, the output end of the high-voltage voltage dividing unit, that is, the output signal end and the output ground end, corresponds to the center pin, the metal shell and the bayonet of the BNC male port.

[0049] In this embodiment, since the output end of the high-voltage voltage dividing unit is mostly a BNC adapter, in order to ensure the connection between the matching circuit and the high-voltage voltage dividing unit and the digital multimeter, two commonly used interfaces are selected as the interface of the matching circuit. When the interface is a BNC interface, a double-row banana plug adapter BNC female port adapter and a three-way adapter can be used to realize the connection between the matching circuit and the high-voltage voltage dividing unit and the digital multimeter; when the interface is a terminal post, only a double-row banana plug adapter BNC female port adapter is needed to realize the connection between the matching circuit and the high-voltage voltage dividing unit and the digital multimeter. The interface of the matching circuit provided in the above can not only realize the accurate and convenient connection between the matching circuit and the high-voltage voltage dividing unit and the digital multimeter, but also provides diversified interfaces of the matching circuit.

[0050] Optionally, the matching circuit 301 comprises a first branch 3011 and a second branch 3012. One end of the first branch 3011 and one end of the second branch 3012 are connected to the signal end of the interface 302.

[0051] The other end of the first branch 3011 and the other end of the second branch 3012 are connected to the ground end of the interface.

[0052] Optionally, when the internal resistance of the digital multimeter is greater than 10 GΩ, the resistance value of the first branch 3011 is 1 MΩ. When the internal resistance of the digital multimeter is 10 MΩ, the resistance value of the first branch 3011 is 1.111 MΩ.

[0053] Optionally, Figure 3 A circuit example of the first branch provided by the embodiment of the present application is shown in FIG. 2. Figure 3 As shown in FIG. 2, when the resistance value of the first branch 3011 is 1.111 MΩ, the first branch 3011 comprises a first resistor R1, a second resistor R2 and a third resistor R3 connected in series. The resistance value of the first resistor R1 is 1 MΩ, the resistance value of the second resistor R2 is 110 kΩ, and the resistance value of the third resistor R3 is 1.1 kΩ.

[0054] Optionally, Figure 4 Another circuit example of the first branch provided by the embodiment of the present application is shown in FIG. 3. Figure 4 As shown in FIG. 3, when the resistance value of the first branch 3011 is 1 MΩ, the first branch 3011 comprises a fourth resistor R4. The resistance value of the fourth resistor R4 is 1 MΩ.

[0055] In the embodiment, the first branch is taken as a resistance part branch in the matching circuit. According to the range and internal resistance of the digital multimeter and the internal resistance of the output end of the high-voltage voltage dividing unit, the accurate resistance value required by the matching circuit to realize the matching between the output end of the high-voltage voltage dividing unit and the input end of the digital multimeter can be determined. Then, a suitable resistor is selected in the first branch according to the resistance value, so as to realize the matching function of the matching circuit.

[0056] Optionally, the second branch 3012 comprises a first capacitor C1, a second capacitor C2 and a third capacitor C3 connected in parallel. The capacitance values of the first capacitor C1, the second capacitor C2 and the third capacitor C3 are all 20 pF; or the capacitance values of the first capacitor C1 and the second capacitor C2 are both 5 pF, and the capacitance value of the third capacitor C3 is 4 pF.

[0057] Exemplarily, Figure 5 A circuit example of the second branch provided by the embodiment of the present application is shown in FIG. 4. Figure 5 As shown in FIG. 4, the first capacitor C1, the second capacitor C2 and the third capacitor C3 are connected in parallel with each other and jointly constitute the second branch.

[0058] Optionally, the second branch 3012 comprises a fourth capacitor C4, a fifth capacitor C5 and a sixth capacitor C6. The fourth capacitor C4 and the fifth capacitor C5 are connected in series and then connected in parallel with the sixth capacitor C6. The capacitance of the fourth capacitor C4 and the fifth capacitor C5 is 18 picofarads, and the capacitance of the sixth capacitor C6 is 20 picofarads.

[0059] Exemplarily, Figure 6 Another circuit example of the second branch provided by the embodiment of the present application is shown in FIG. 4. As shown in FIG. 4, Figure 6 The fourth capacitor C4 and the fifth capacitor C5 are connected in series and then connected in parallel with the sixth capacitor C6, and together constitute the second branch.

[0060] The total capacitance of the second branch of the matching circuit can be adjusted adaptively according to requirements, and is not limited here.

[0061] In the embodiment, since the input impedance of the load adapted by the output end of the high-voltage voltage dividing unit is a certain resistance in parallel with a certain capacitance, in order to ensure that the input end of the digital multimeter can be matched with the output end of the high-voltage voltage dividing unit, the second branch is taken as the capacitance branch of the matching circuit, and the accurate capacitance required by the matching circuit to realize the matching between the output end of the high-voltage voltage dividing unit and the input end of the digital multimeter can be determined according to the capacitance value, i.e. the capacitance, of the load impedance adapted by the output end of the high-voltage voltage dividing unit. Further, a suitable capacitor is selected in the second branch according to the capacitance, so as to realize the matching function of the matching circuit.

[0062] The utility model provides a kind of connecting circuit applied to analyzer, one, since the output end of high voltage voltage dividing unit is mostly BNC adapter, therefore, to guarantee the connection between matching circuit and high voltage voltage dividing unit, digital multimeter respectively, here selects two commonly used interfaces as the interface of matching circuit.When the interface is BNC interface, it can be connected between matching circuit and high voltage voltage dividing unit, digital multimeter respectively using, for example, double row banana plug conversion BNC female socket adapter and tee adapter;When the interface is terminal post, it only needs to be connected between matching circuit and high voltage voltage dividing unit, digital multimeter respectively using, for example, double row banana plug conversion BNC female socket adapter.The interface of matching circuit provided in the above, not only can be connected between matching circuit and high voltage voltage dividing unit, digital multimeter accurately and conveniently, but also provides diversified interface of matching circuit.The first branch is used as resistance part branch in matching circuit, and according to the range and internal resistance of digital multimeter, and according to the internal resistance of the output end of high voltage voltage dividing unit, the accurate resistance value required for matching circuit to realize the matching between the output end of high voltage voltage dividing unit and the input end of digital multimeter can be determined.Furthermore, appropriate resistance is selected in the first branch according to resistance value;And since the input impedance of the output end of high voltage voltage dividing unit is a certain resistance in parallel with a certain capacitor, in order to ensure that the input end of digital multimeter can be matched with the output end of high voltage voltage dividing unit, the second branch is used as capacitor part branch in matching circuit, and according to the capacitance value of the load impedance adapted by the output end of high voltage voltage dividing unit, i.e., the capacity value, the accurate capacity value required for matching circuit to realize the matching between the output end of high voltage voltage dividing unit and the input end of digital multimeter can be determined.Furthermore, appropriate capacitor is selected in the second branch according to capacity value.Through the joint action of the first branch and the second branch, the matching effect of matching circuit can be finally realized.

[0063] Figure 7 A structural diagram of the analysis system is provided in the utility model. Figure 7 As shown in the figure, the system comprises: the connecting circuit applied to analyzer in any of the above embodiments, and analyzer A and electronic device B.

[0064] Specifically, digital multimeter 10 can be in communication connection with electronic device B, for sending the standard pulse data measured by it to electronic device B.

[0065] Optionally, in the process of calibrating the analyzer, the input end of the analyzer is connected to a heart defibrillator or a transcutaneous pacemaker.

[0066] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, the steps described in the present application can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0067] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A connection circuit applied to an analyzer, characterized by, The application relates to a connecting circuit applied to an analyzer, an analyzer and an electronic device. The connecting circuit comprises a digital multimeter, a matching unit and a high-voltage voltage dividing unit. An input end of the high-voltage voltage dividing unit is externally connected with an analyzer, and is used for collecting a high-voltage signal received by the analyzer and converting the high-voltage signal into a low-voltage signal. A high-voltage input end of the digital multimeter is connected with an output signal end of the high-voltage voltage dividing unit and a signal end of the matching unit, a low-voltage input end of the digital multimeter is connected with an output grounding end of the high-voltage voltage dividing unit and a grounding end of the matching unit, and the grounding end of the matching unit is grounded. The digital multimeter is used for measuring the low-voltage signal and sending a measurement result to the electronic device.

2. The connection circuit for an analyzer according to claim 1, wherein The matching unit comprises a matching circuit and an interface. One end of the matching circuit is connected with a signal end of the interface, and the other end of the matching circuit is connected with a grounding end of the interface.

3. The connection circuit for an analyzer according to claim 2, wherein The interface is a BNC interface or a terminal post.

4. The connection circuit for an analyzer according to claim 2, wherein The matching circuit comprises a first branch and a second branch. One end of the first branch and one end of the second branch are connected with the signal end of the interface, and the other end of the first branch and the other end of the second branch are connected with the grounding end of the interface.

5. The connection circuit for an analyzer according to claim 4, wherein When the internal resistance of the digital multimeter is greater than 10 G, the resistance value of the first branch is 1 M. When the internal resistance of the digital multimeter is 10 M, the resistance value of the first branch is 1.111 M.

6. The connection circuit for an analyzer according to claim 5, wherein When the resistance value of the first branch is 1.111 M, the first branch comprises a first resistor, a second resistor and a third resistor connected in series. The resistance value of the first resistor is 1 M, the resistance value of the second resistor is 110 k, and the resistance value of the third resistor is 1.1 k.

7. The connection circuit for an analyzer according to claim 5, wherein When the resistance value of the first branch is 1 M, the first branch comprises a fourth resistor, and the resistance value of the fourth resistor is 1 M.

8. The connection circuit for an analyzer according to claim 4, wherein The second branch comprises a first capacitor, a second capacitor and a third capacitor connected in parallel. The capacitance values of the first capacitor, the second capacitor and the third capacitor are all 20 pF, or the capacitance values of the first capacitor and the second capacitor are both 5 pF, and the capacitance value of the third capacitor is 4 pF.

9. The connection circuit for an analyzer according to claim 4, wherein The second branch comprises a fourth capacitor, a fifth capacitor and a sixth capacitor, wherein the fourth capacitor and the fifth capacitor are connected in series and then connected in parallel with the sixth capacitor. The capacitance values of the fourth capacitor and the fifth capacitor are both 18 pF, and the capacitance value of the sixth capacitor is 20 pF.

10. An analytical system characterized by, The application relates to a connecting circuit applied to an analyzer, an analyzer and an electronic device. The high-voltage voltage dividing unit of the connecting circuit applied to the analyzer is electrically connected with the analyzer, and the connecting circuit applied to the analyzer and the electronic device are in communication through a serial port.

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