Capacitance coupling tester calibration device and calibration method thereof

Abstract

The application discloses a kind of electric capacity coupling tester checking device and its checking method, belong to electric capacity coupling test technical field, including terminal 1, terminal 2, terminal 3, terminal 4 and ground terminal;High-value capacitor C1 and high-value capacitor C2;Low-value capacitor C3, low-value capacitor C4 and low-value capacitor C5.High-value capacitor C1 is connected between terminal 1 and terminal 2, high-value capacitor C2 is connected between terminal 3 and terminal 4;Low-value capacitor C3 is connected between terminal 2 and terminal 3;Low-value capacitor C4 is connected between terminal 1 and ground terminal, and low-value capacitor C5 is connected between terminal 4 and ground terminal.Each terminal is connected to the corresponding port of the instrument to be calibrated once, and only needs to switch the measurement range reading, greatly simplifies the operation steps, shortens the calibration time, can reflect the positive and negative symmetry of test results, reflect the indication value of the measurement circuit under actual load, and the results of the measuring instrument can be checked at any time.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of capacitive coupling test, and particularly relates to a capacitive coupling tester verification device and a verification method thereof. BACKGROUND

[0002] The capacitive coupling coefficient (k value) and the ground capacitive coupling imbalance (e value) are main parameters for representing the anti-interference ability of symmetrical communication cables and are necessary inspection items for the cables leaving the factory. The symmetrical communication cable is generally composed of two line cores to form a line pair, and two line pairs form a four-wire group. There is a partial capacitance between the line cores, and the capacitance between the lines is called the working capacitance of the communication cable. The capacitive coupling coefficient is used to represent the capacitive coupling between different line pairs. For example, k1 is defined as the capacitive coupling between the first pair of real roads and the second pair of real roads, that is, k1=C13+C24-C23-C14; the ground capacitive imbalance is used to represent the degree of imbalance of the partial capacitance of each core line to the ground. For example, e1 is defined as the ground capacitive imbalance of the first pair of real roads, that is, e1=C10-C20. Wherein C13, C24, C23, C14, C10, C20 all represent the partial capacitance between the line cores. The capacitive coupling tester is a special instrument for testing the capacitive coupling coefficient and the ground capacitive imbalance of the four-wire group of the symmetrical communication cable. Common instruments include bridge-type capacitive coupling testers, digital capacitive coupling testers, and intelligent capacitive coupling testers. The digital and intelligent capacitive coupling testers can also detect the working capacitance (C value) of the symmetrical cable. When measuring, the measured four-wire group is connected to the specified port of the instrument according to the line sequence a, b, c, d and its ground line at the same time, different parameter gears are selected according to the needs, and the corresponding values are read from the instrument.

[0003] The C value of the symmetrical communication cable is about tens of nanofarad, and the k value and e value are generally between tens of picofarad and hundreds of picofarad. As a kind of precision measuring instrument, the capacitive coupling tester needs to be frequently calibrated to ensure the accuracy of the measurement results. At present, the calibration method is carried out according to JJG138 "Precise Capacitance Measuring Instrument Verification Regulation", mainly by connecting a capacitor with a known capacitance value to the corresponding port of the instrument, reading the measurement value from the instrument end to determine whether the measurement result of the instrument meets the requirements. The calibration steps are introduced below with the frequently used measured parameters C1, C2, k1, e1 and e2: (1) select a 10nF-100nF capacitor and connect it between the instrument ports a and b, select the C1 measurement scale, and read the instrument value as the C1 calibration value; (2) select a 10nF-100nF capacitor and connect it between the instrument ports c and d, select the C2 measurement scale, and read the instrument value as the C2 calibration value; (3) select a 100pF-1000pF capacitor and connect it between the instrument ports a and c, select the k1 measurement scale, and read the instrument value as the k1 calibration value; (4) select a 100pF-1000pF capacitor and connect it between the instrument ports a and ground, select the e1 measurement scale, and read the instrument value as the e1 calibration value; (5) select a 100pF-1000pF capacitor and connect it between the instrument ports c and ground, select the e2 measurement scale, and read the instrument value as the e2 calibration value; (6) compare the calibration value with the capacitor to determine whether it meets the requirements. However, the existing calibration method has the following problems: (1) it needs to connect different capacitors between the ports and switch them multiple times, which is complex and inconvenient to operate; (2) in actual measurement, the capacitive coupling coefficient and the ground capacitance imbalance are essentially capacitive differences, and the values are positive or negative. The existing technology can only read a positive or negative value, and cannot reflect the positive and negative symmetry of the test results; (3) each calibration can only connect one capacitor, while in the actual measurement process, the entire cable is connected to the measuring instrument, so the existing calibration method cannot reflect the actual load value of the measurement line.

[0004] In view of the technical problems of the existing capacitive coupling tester calibration method, such as complex operation and calibration results that cannot meet the actual needs, a new capacitive coupling tester calibration device and method are needed to simplify the operation steps, shorten the calibration time, and reflect the actual load value of the measurement line. SUMMARY

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present application is to provide a capacitive coupling tester calibration device and method to solve the technical problems of the original calibration method, such as complex operation and calibration results that cannot meet the actual needs.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0007] The application discloses a capacitor coupling tester checking device,

[0008] The capacitor coupling tester checking device comprises terminals 1, 2, 3 and 4, a ground terminal, high-value capacitors C1 and C2, and low-value capacitors C3, C4 and C5.

[0009] The high-value capacitor C1 is connected between the terminals 1 and 2, the high-value capacitor C2 is connected between the terminals 3 and 4, the low-value capacitor C3 is connected between the terminals 2 and 3, the low-value capacitor C4 is connected between the terminal 1 and the ground terminal, and the low-value capacitor C5 is connected between the terminal 4 and the ground terminal.

[0010] The high-value capacitor C1 is connected by n1 10nF standard capacitors in parallel, and n1 = 1-10.

[0011] The high-value capacitor C2 is connected by n2 10nF standard capacitors in parallel, and n2 = 1-10.

[0012] The low-value capacitor C3 is connected by n3 100pF standard capacitors in parallel, and n3 = 1-10.

[0013] The low-value capacitor C4 is connected by n4 100pF standard capacitors in parallel, and n4 = 1-10.

[0014] The low-value capacitor C5 is connected by n5 100pF standard capacitors in parallel, and n5 = 1-10.

[0015] Preferably, the high-value capacitors C1 and C2 and the low-value capacitors C3, C4 and C5 are packaged in a shielded box.

[0016] Further preferably, the high-value capacitors C1 and C2 and the low-value capacitors C3, C4 and C5 are packaged in a metal shielded box by means of shelf welding.

[0017] Preferably, the terminals 1, 2, 3, 4 and the ground terminal are all stripped wire clamps.

[0018] Further preferably, the stripped wire clamp is a spring clamp made of stainless steel sheet metal.

[0019] Further preferably, the stripped wire clamp is provided with a mounting groove at one end and a bayonet at the other end.

[0020] More preferably, the mounting groove is a U-shaped mounting groove.

[0021] More preferably, the bayonet is bent to both sides at the fork.

[0022] The application further discloses a calibration method of the capacitor coupling tester calibration device.

[0023] The terminal 1, the terminal 2, the terminal 3, the terminal 4 and the ground terminal of the capacitor coupling tester calibration device are sequentially connected in positive order with the port a, the port b, the port c, the port d and the port ground of the instrument to be calibrated respectively.

[0024] (1) C1 measurement is selected, and a value displayed by the instrument to be calibrated is read as a C1 calibration value; at this time, a nominal value of the calibration device is

[0025] +(n1*10)nF;

[0026] (2) C2 measurement is selected, and a value displayed by the instrument to be calibrated is read as a C2 calibration value; at this time, a nominal value of the calibration device is

[0027] +(n2*10)nF;

[0028] (3) k1 measurement is selected, and a value displayed by the instrument to be calibrated is read as a k1 calibration value; at this time, a nominal value of the calibration device is

[0029] +(n3*100)pF;

[0030] (4) e1 measurement is selected, and a value displayed by the instrument to be calibrated is read as an e1 calibration value; at this time, a nominal value of the calibration device is

[0031] +(n4*100)pF;

[0032] (5) e2 measurement is selected, and a value displayed by the instrument to be calibrated is read as an e2 calibration value; at this time, a nominal value of the calibration device is

[0033] -(n5*100)pF;

[0034] The calibration values are compared with the capacitor values of the capacitor coupling tester calibration device, and it is determined whether the calibration values meet the requirements.

[0035] Preferably, the terminal 1, the terminal 2, the terminal 3, the terminal 4 and the ground terminal of the capacitor coupling tester calibration device are sequentially connected in reverse order with the port d, the port c, the port b, the port a and the port ground of the instrument respectively.

[0036] (1) C1 measurement is selected, and a value displayed by the instrument to be calibrated is read as a C1 calibration value; at this time, a nominal value of the calibration device is

[0037] +(n2*10)nF;

[0038] (2) C2 measurement is selected, and a value displayed by the instrument to be calibrated is read as a C2 calibration value; at this time, a nominal value of the calibration device is

[0039] +(n1*10)nF

[0040] (3) Select k1 measurement range, read the value of the instrument to be checked as k1 check value; at this time, the nominal value of the check device is

[0041] +(n3*100)pF

[0042] (4) Select e1 measurement range, read the value of the instrument to be checked as e1 check value; at this time, the nominal value of the check device is

[0043] -(n5*100)pF

[0044] (5) Select e2 measurement range, read the value of the instrument to be checked as e2 check value; at this time, the nominal value of the check device is

[0045] +(n4*100)pF

[0046] Compare each check value with the capacitance value of the capacitance coupling tester check device to determine whether it meets the requirements.

[0047] Compared with the prior art, the present application has the following beneficial effects:

[0048] The application discloses a kind of capacitive coupling tester verification device, which includes terminal 1, terminal 2, terminal 3, terminal 4 and ground terminal;High-value capacitor C1 and high-value capacitor C2;And low-value capacitor C3, low-value capacitor C4 and low-value capacitor C5;High-value capacitor C1 is connected between terminal 1 and terminal 2, high-value capacitor C2 is connected between terminal 3 and terminal 4, low-value capacitor C3 is connected between terminal 2 and terminal 3, low-value capacitor C4 is connected between terminal 1 and ground terminal, and low-value capacitor C5 is connected between terminal 4 and ground terminal;A plurality of capacitors can be simultaneously connected to the corresponding port of the instrument to be calibrated during the calibration process, and only the measurement range reading needs to be switched during the calibration process, avoiding multiple changes of different capacitors and multiple switching of different capacitors between ports, greatly simplifying the operation steps, and shortening the calibration time to one fourth of the existing technology;The existing calibration method can only read a positive value or a negative value, and cannot reflect the positive and negative symmetry of the test result;The terminals of the capacitive coupling tester verification device disclosed by the application can be connected in positive sequence or reverse sequence to the ports of the device to be calibrated, which can reflect the positive and negative symmetry of the test result, and make up for the fact that the existing technology cannot reflect the value of the measurement line under actual load;And the capacitive coupling tester verification device covers the commonly used test items of the instrument, provides up to 9 groups of standard values, and the test results are positive and negative, which can reflect the positive and negative symmetry of the test result;It can be used for daily calibration of capacitive coupling tester, and is especially suitable for calibration of measurement results of measuring instrument at any time in test site.C1 is connected in parallel by n1 10nF standard capacitors, n1=1~10;C2 is connected in parallel by n2 10nF standard capacitors, n2=1~10;C3 is connected in parallel by n3 100pF standard capacitors, n3=1~10;C4 is connected in parallel by n4 100pF standard capacitors, n4=1~10;C5 is connected in parallel by n5 100pF standard capacitors, n5=1~10, and the number of capacitors can be selected according to the capacitance of the measured cable after rounding, and n1, n2, n3, n4 and n5 take different natural numbers, which can further expand the standard values of the verification device.

[0049] Further, high-value capacitor C1 and high-value capacitor C2, and low-value capacitor C3, low-value capacitor C4 and low-value capacitor C5 are packaged in a metal shielding box by means of shelf welding, and the wiring can take a shortcut, so that the wiring is the nearest, and the wiring is reasonable.

[0050] Further, terminal 1, terminal 2, terminal 3, terminal 4 and ground terminal are all stripping-free fixtures, one end of which is provided with a mounting groove for fixing spring clips, and the other end is provided with a bayonet for automatic stripping, which can automatically penetrate the insulating plastic when the insulated wire is inserted into the bayonet with force, thereby eliminating the conventional stripping.

[0051] Further, the forked opening is bent to two sides, so as to facilitate the insertion of the insulating wire into the opening.

[0052] The application also discloses a calibration method of the capacitor coupling tester calibration device.

[0053] Further, the calibration can also be performed by reverse connection mode. In actual measurement, the capacitor coupling coefficient and the unbalance of the ground capacitor essentially belong to the capacitor difference, and the values are positive or negative. The existing calibration method can only read a positive value or a negative value, and cannot reflect the positive and negative symmetry of the test result. The capacitor coupling tester calibration device is connected to each port of the instrument to be calibrated by the forward and reverse connection modes, and two different standard values can be obtained in a shielding box by the forward and reverse calibration methods, so that the standard values of the calibration device are expanded, and the positive and negative symmetry of the test result can be reflected. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 Fig. 1 is an electrical connection diagram of the capacitor coupling tester calibration device disclosed by the application;

[0055] Figure 2 Fig. 2 is a connection diagram of each terminal of the capacitor coupling tester calibration device disclosed by the application and an internal electrical circuit;

[0056] Figure 3 Fig. 3 is a wire stripping clamp diagram of the capacitor coupling tester calibration device disclosed by the application. DETAILED DESCRIPTION

[0057] In order for those skilled in the art to better understand the application, the technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the application.

[0058] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0059] The present invention is described in further detail below with reference to the accompanying drawings:

[0060] See also Figure 1 This is a schematic diagram of the electrical connections of the capacitance coupling tester calibration device disclosed in the present invention. As can be seen from the figure, the capacitance coupling tester calibration device includes: 5 terminals, 2 groups of high-value capacitors, and 3 groups of low-value capacitors. The 5 terminals are: Terminal 1, Terminal 2, Terminal 3, Terminal 4, and a ground terminal. The 2 groups of high-value capacitors are: high-value capacitor C1 and high-value capacitor C2. The 3 groups of low-value capacitors are: low-value capacitor C3, low-value capacitor C4, and low-value capacitor C5. The high-value capacitor C1 is connected between Terminal 1 and Terminal 2, the high-value capacitor C2 is connected between Terminal 3 and Terminal 4, the low-value capacitor C3 is connected between Terminal 2 and Terminal 3, the low-value capacitor C4 is connected between Terminal 1 and the ground terminal, and the low-value capacitor C5 is connected between Terminal 4 and the ground terminal.

[0061] See also Figure 2 The diagram of the connection between the terminals of the capacitance coupling tester calibration device disclosed in the present invention and the internal electrical circuit is shown in sequence. As can be seen from the diagram, the capacitors of the capacitance coupling tester calibration device are connected in accordance with the Figure 1 The electrical connections shown are encapsulated in a metal shielding box using scaffolding welding. Each terminal is sequentially connected to the internal electrical circuit of the capacitance coupling tester being calibrated. Each terminal is a stripping-free clamp.

[0062] See also Figure 3 This is a diagram of the wire-stripping-free fixture of the capacitance coupling tester calibration device disclosed in the present invention; as can be seen from the figure, the wire-stripping-free fixture disclosed in the present invention is made of a spring clip made of 301 stainless steel sheet metal. A mounting groove is provided at one end of the wire-stripping-free fixture, and a bayonet is provided at the other end. The mounting groove is a U-shaped mounting groove for fixing the spring clip. The fork of the bayonet is bent to both sides for automatic wire stripping. When the connecting insulated wire is forcefully inserted into the bayonet, it can automatically penetrate the insulating plastic, thereby eliminating conventional wire stripping.

[0063] The application discloses a capacitor coupling tester verification device, which comprises five terminals, a high-value capacitor C1, a high-value capacitor C2, a low-value capacitor C3, a low-value capacitor C4 and a low-value capacitor C5.

[0064] The five terminals are terminal 1, terminal 2, terminal 3, terminal 4 and a ground terminal.

[0065] The high-value capacitor C1 is connected in parallel by n1 standard capacitors of 10nF, wherein n1 = 1-10.

[0066] The high-value capacitor C2 is connected in parallel by n2 standard capacitors of 10nF, wherein n2 = 1-10.

[0067] The low-value capacitor C3 is connected in parallel by n3 standard capacitors of 100pF, wherein n3 = 1-10.

[0068] The low-value capacitor C4 is connected in parallel by n4 standard capacitors of 100pF, wherein n4 = 1-10.

[0069] The low-value capacitor C5 is connected in parallel by n5 standard capacitors of 100pF, wherein n5 = 1-10.

[0070] The high-value capacitor C1 is connected between the terminal 1 and the terminal 2, and the high-value capacitor C2 is connected between the terminal 3 and the terminal 4.

[0071] The low-value capacitor C3 is connected between the terminal 2 and the terminal 3, the low-value capacitor C4 is connected between the terminal 1 and the ground terminal, and the low-value capacitor C5 is connected between the terminal 4 and the ground terminal.

[0072] The capacitor coupling tester verification device disclosed by the application is packaged in a metal shielding box, and the terminals are sequentially connected with internal electrical circuits of a device to be verified. Figure 1 As shown in the figure. Figure 2

[0073] The capacitor quantity n can be selected according to the capacity of a cable to be measured after being rounded off, for example, if the measured value of a commonly used communication cable is (20-40)nF, n1 is 2, n2 is 3, so that two different standard values can be obtained in a shielding box through the forward sequence and reverse sequence verification methods. Similarly, n3, n4 and n5 are also natural numbers, which can further expand the standard values of the verification device.

[0074] For example, if n1 is 2, n2 is 3, n3 is 2, n4 is 6 and n5 is 8, the standard values generated are as follows:

[0075] ​Positive sequence C1 = 20nF; C2 = 30nF; k1 = 200pF; e1 = +400pF; e2 = -800pF.

[0076] Negative sequence C1 = 30nF; C2 = 20nF; k1 = 200pF; e1 = +800pF; e2 = -400pF.

[0077] Each terminal is composed of a stripping-free wire clamp (such as Figure 3 ), which is a set of spring clamps made of 301 stainless steel sheet metal. The installation groove is used to fix the spring clamp, and the clamp opening is used to automatically strip the wire. When the insulated wire is inserted into the clamp opening with force, the insulation plastic can be automatically penetrated, thereby eliminating the conventional stripping.

[0078] The application also discloses a calibration method of the capacitor coupling tester calibration device, which comprises the following steps:

[0079] The terminal 1, the terminal 2, the terminal 3, the terminal 4 and the ground terminal of the capacitor coupling tester calibration device are connected with the port a, the port b, the port c, the port d and the port ground of the instrument to be calibrated (positive sequence) respectively.

[0080] (1) Select the C1 measurement range, read the indication value of the instrument to be calibrated as the C1 calibration value; at this time, the nominal value of the calibration device is

[0081] +(n1*10)nF;

[0082] (2) Select the C2 measurement range, read the indication value of the instrument to be calibrated as the C2 calibration value; at this time, the nominal value of the calibration device is

[0083] +(n2*10)nF;

[0084] (3) Select the k1 measurement range, read the indication value of the instrument to be calibrated as the k1 calibration value; at this time, the nominal value of the calibration device is

[0085] +(n3*100)pF;

[0086] (4) Select the e1 measurement range, read the indication value of the instrument to be calibrated as the e1 calibration value; at this time, the nominal value of the calibration device is

[0087] +(n4*100)pF;

[0088] (5) Select the e2 measurement range, read the indication value of the instrument to be calibrated as the e2 calibration value; at this time, the nominal value of the calibration device is

[0089] -(n5*100)pF.

[0090] The terminal 1, the terminal 2, the terminal 3, the terminal 4 and the ground terminal of the capacitor coupling tester calibration device are connected with the port d, the port c, the port b, the port a and the port ground of the instrument (negative sequence) respectively.

[0091] (1) Select C1 measurement file, read the value of the instrument to be checked as C1 calibration value; at this time, the nominal value of the calibration device is

[0092] +(n2*10)nF;

[0093] (2) Select C2 measurement file, read the value of the instrument to be checked as C2 calibration value; at this time, the nominal value of the calibration device is

[0094] +(n1*10)nF;

[0095] (3) Select k1 measurement file, read the value of the instrument to be checked as k1 calibration value; at this time, the nominal value of the calibration device is

[0096] +(n3*100)pF;

[0097] (4) Select e1 measurement file, read the value of the instrument to be checked as e1 calibration value; at this time, the nominal value of the calibration device is

[0098] -(n5*100)pF;

[0099] (5) Select e2 measurement file, read the value of the instrument to be checked as e2 calibration value; at this time, the nominal value of the calibration device is

[0100] +(n4*100)pF.

[0101] The capacitor coupling tester calibration device disclosed in the application can be connected to the corresponding port of the instrument to be calibrated at one time, and only the measurement position reading needs to be switched during the calibration process, so that the operation steps are greatly simplified, and the calibration time is shortened to one fourth of the prior art. The calibration method of the capacitor coupling tester calibration device covers common test items of the instrument, provides up to 9 groups of standard values, and the test results are positive and negative, which can reflect the positive and negative symmetry of the test results. The capacitor coupling tester calibration device includes a plurality of capacitors, which are connected to the instrument at the same time during the calibration process, which makes up for the fact that the prior art cannot reflect the value of the measurement line under actual load. The capacitor coupling tester calibration device can be used for daily calibration of the capacitor coupling tester, and is particularly suitable for calibrating the measurement results of the measuring instrument at any time in the test site.

[0102] The above content only illustrates the technical idea of the application, and cannot limit the protection scope of the application. Any modification made on the basis of the technical solution according to the technical idea of the application falls within the protection scope of the claims of the application.

Claims

1. A calibration method for a capacitance coupling tester calibration device, characterized in that: It includes a capacitance coupling tester calibration device, specifically including: A high-value capacitor C1 is connected between terminal 1 and terminal 2, and a high-value capacitor C2 is connected between terminal 3 and terminal 4; a low-value capacitor C3 is connected between terminal 2 and terminal 3; a low-value capacitor C4 is connected between terminal 1 and the ground terminal, and a low-value capacitor C5 is connected between terminal 4 and the ground terminal; The high-value capacitor C1 is composed of n1 10nF standard capacitors connected in parallel, n1=1~10; The high-value capacitor C2 is composed of n2 10nF standard capacitors connected in parallel, n2 = 1~10; The low-value capacitor C3 is composed of n3 100pF standard capacitors connected in parallel, n3 = 1~10; The low-value capacitor C4 is composed of n4 100pF standard capacitors connected in parallel, n4 = 1~10; The low-value capacitor C5 is composed of n5 100pF standard capacitors connected in parallel, n5 = 1~10; Verification methods include: Connect terminals 1, 2, 3, 4 and the ground terminal of the capacitance coupling tester calibration device to ports a, b, c, d and the ground of the instrument to be calibrated in positive sequence. (1) Select the C1 measurement mode and read the value indicated by the instrument to be calibrated as the C1 calibration value; the nominal value of the calibration device at this time is: + (n1×10)nF; (2) Select the C2 measurement file and read the value of the instrument to be calibrated as the C2 calibration value; at this time, the nominal value of the calibration device is + (n2×10)nF; (3) Select the k1 measurement file and read the value of the instrument to be calibrated as the k1 calibration value; at this time, the nominal value of the calibration device is + (n3 × 100) pF; (4) Select the e1 measurement file and read the value of the instrument to be calibrated as the e1 calibration value; at this time, the nominal value of the calibration device is + (n4 × 100) pF; (5) Select the e2 measurement file and read the value of the instrument to be calibrated as the e2 calibration value; at this time, the nominal value of the calibration device is -(n5×100)pF; Compare each calibration value with the capacitance value of the capacitance coupling tester calibration device to determine whether it meets the requirements; The method further includes: connecting terminal 1, terminal 2, terminal 3, terminal 4 and the ground terminal of the capacitance coupling tester calibration device to instrument port d, port c, port b, port a and port ground in reverse order respectively; (1) Select the C1 measurement file and read the value of the instrument to be calibrated as the C1 calibration value; at this time, the nominal value of the calibration device is + (n2×10)nF; (2) Select the C2 measurement file and read the value of the instrument to be calibrated as the C2 calibration value; at this time, the nominal value of the calibration device is + (n1×10)nF; (3) Select the k1 measurement file and read the value of the instrument to be calibrated as the k1 calibration value; at this time, the nominal value of the calibration device is + (n3 × 100) pF; (4) Select the e1 measurement file and read the value of the instrument to be calibrated as the e1 calibration value; at this time, the nominal value of the calibration device is -(n5×100)pF; (5) Select the e2 measurement file and read the value of the instrument to be calibrated as the e2 calibration value; at this time, the nominal value of the calibration device is + (n4 × 100) pF; Compare each calibration value with the capacitance value of the capacitance coupling tester calibration device to determine whether it meets the requirements.

2. The calibration method of the capacitance coupling tester calibration device according to claim 1, characterized in that: The terminals 1, 2, 3, 4 and the grounding terminal are all wire stripping-free clamps; the high-value capacitors C1 and C2, as well as the low-value capacitors C3, C4 and C5 are encapsulated in a shielding box; the high-value capacitors C1 and C2, as well as the low-value capacitors C3, C4 and C5 are encapsulated in a metal shielding box by scaffolding welding.

3. The calibration method of the capacitance coupling tester calibration device according to claim 2, characterized in that: The stripping-free wire clamp is a spring clamp made of stainless steel sheet metal.

4. The calibration method of the capacitance coupling tester calibration device according to claim 2, characterized in that: One end of the stripping-free wire clamp is provided with a mounting groove, and the other end is provided with a clamping opening.

5. The calibration method of the capacitance coupling tester calibration device according to claim 4, characterized in that: The mounting groove is a U-shaped mounting groove.

6. The calibration method of the capacitance coupling tester calibration device according to claim 4, characterized in that: The fork of the bayonet is bent toward two sides.

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