CN215263692U

CN215263692U - Voltage wire rewinding compensation four-wire system

Info

Publication number: CN215263692U
Application number: CN202121035369.8U
Authority: CN
Inventors: 陈锡辉; 任光前
Original assignee: Shenzhen Xinweier Electronics Co Ltd
Current assignee: Shenzhen Xinweier Electronics Co Ltd
Priority date: 2021-05-14
Filing date: 2021-05-14
Publication date: 2021-12-21
Anticipated expiration: 2031-05-14

Abstract

The utility model provides a voltage line rewinding compensation four-wire system, including connecting cable, measurement four-wire anchor clamps, measuring circuit board, connecting cable one end with it is connected to measure four-wire anchor clamps, the connecting cable other end is connected with measuring circuit board, the beneficial effects of the utility model reside in that: the structure is simple, the cost is low, the same frequency interference signals induced by the current lines in the voltage lines can be greatly reduced, and the signal-to-noise ratio of useful measurement signals is improved; the voltage line rewinding compensation four-wire system can be applied to mobile measurement, is more convenient when applied to fixed position measurement, and can obtain higher measurement precision when measuring small resistance when adjusting the areas of two areas to be approximately equal; because the voltage line adopts the compensation of backwinding, the interference signal that voltage line and backwinding wire return circuit were induced in the alternating magnetic field is also the opposite phase, and the area is similar, also can offset, also improves useful measuring signal to the signal to noise ratio of interference signal.

Description

Voltage wire rewinding compensation four-wire system

[ technical field ] A method for producing a semiconductor device

The utility model relates to a four-wire system measures technical field, especially relates to a voltage line rewinding compensation four-wire system.

[ background of the invention ]

The high-precision detection of the weak voltage signal has wide application in the fields of scientific research, engineering manufacturing, aerospace, military, medicine and the like. However, the amplitude of the weak voltage signal is very small, and interference of noise signals and other interference signals may occur in the actual measurement process, so that the weak voltage signal is difficult to be accurately detected during measurement, or a part of the weak voltage signal may not be detected.

In an instrument for precisely measuring impedance, a four-wire system measurement is often used to improve measurement accuracy. When weak voltage on weak resistance (capacitive reactance, inductive reactance) of milliohm or microohm level is measured, alternating magnetic flux is generated by a loop formed by measuring current, mutual inductance voltage noise interference is generated on a voltage loop by the alternating magnetic flux generated by the loop, the interference signal and a useful signal are same-frequency signals and cannot be reduced by filtering measures, and the mutual inductance interference signal is often far larger than the useful signal during measurement of the weak resistance (impedance), so that the measurement accuracy is very low. Therefore, how to reduce the interference of the same-frequency mutual inductance signal on the voltage signal in the measuring loop, improve the signal-to-noise ratio of the input end of the testing instrument, enable the weak voltage signal to be detected with high accuracy, and solve the problem of urgent need.

[ Utility model ] content

The utility model aims to solve the not enough of the mutual inductance interference signal problem of same frequency that current line induction was measured to the four-wire system of using at present and a novel voltage line backwind compensation four-wire system that provides.

The utility model discloses a realize through following technical scheme:

the utility model provides a voltage line rewinding compensation four-wire system, includes connecting cable, measures four-wire anchor clamps, measurement circuit board, connecting cable one end with measure four-wire anchor clamps and be connected, the connecting cable other end is connected with measurement circuit board.

Further, the connecting cable is composed of 2 current lines and 2 voltage lines.

Furthermore, the current line or the voltage line is wound and wired in a fixed area of the measuring four-wire clamp to form two current and voltage coupling areas, the two current and voltage coupling areas are formed, the covering magnetic flux influence of the two areas is opposite, and induction signals caused by alternating magnetic fields of the current line automatically cancel each other.

Further, the current line or the voltage line is a 2-core cable.

Furthermore, the four-wire measuring clamp is a four-wire clamp or a four-wire meter pen or a four-wire wiring terminal or a four-wire probe.

Further, the voltage line comprises a compensation line which is connected with the voltage line in an inverted series mode.

Further, the compensation line may be connected in anti-phase series with the voltage line, either external or/and internal to the instrument.

Furthermore, one end or/and the middle part of the compensation line is/are provided with a line concentration device.

Further, the wire collecting device is a retractable automatic cable tightening device or a retractable solenoid.

The beneficial effects of the utility model reside in that:

(1) the structure is simple, the cost is low, the same frequency interference signals induced by the current lines in the voltage lines can be greatly reduced, and the signal-to-noise ratio of useful measurement signals is improved;

(2) the voltage line rewinding compensation four-wire system can be applied to mobile measurement, is more convenient when applied to fixed position measurement, and can obtain higher measurement precision when measuring small resistance when adjusting the areas of two areas to be approximately equal;

(3) because the voltage line adopts the compensation of backwinding, the interference signal that voltage line and backwinding wire return circuit were induced in the alternating magnetic field is also the opposite phase, and the area is similar, also can offset, also improves the signal-to-noise ratio of useful measuring signal to external interference signal.

[ description of the drawings ]

Fig. 1 is a schematic structural view of an automatic cable tightening device according to an embodiment of the voltage line rewinding compensation four-wire system of the present invention;

FIG. 2 is a schematic diagram of a solenoid structure according to an embodiment of the present invention for voltage line rewinding compensation;

reference numerals: 1. a connecting cable; 11. a current line; 12. a voltage line; 2. measuring a four-wire clamp; 3. measuring the circuit board; 4. a compensation line; 5. a line concentration device.

[ detailed description ] embodiments

The invention will be further described with reference to the accompanying drawings and specific embodiments:

example 1:

as shown in fig. 1, a voltage line rewinding compensation four-wire system comprises a connecting cable 1, a measuring four-wire clamp 2 and a measuring circuit board 3, wherein one end of the connecting cable 1 is connected with the measuring four-wire clamp 2, and the other end of the connecting cable 1 is connected with the measuring circuit board 3.

Preferably, the connection cable 1 consists of 2

current lines

11, 2 voltage lines 12.

Preferably, the current line 11 or the voltage line 12 is routed back in the fixed area of the measuring four-wire jig 2 to form two current-voltage coupling areas, the influence of the covered magnetic fluxes of the two areas is opposite, the induced signals caused by the alternating magnetic field of the current line automatically cancel each other out, when the magnetic flux induced voltage of the two covered areas is U2, the induced signals caused by the alternating magnetic field of the current line automatically cancel each other out, when the magnetic flux induced voltage of the two uncovered areas is U1, a part of the induced signals cannot cancel each other out, and the area of the obvious U1 is smaller than that of the U2.

Preferably, the current line 11 or the voltage line 12 is a 2-core cable.

Preferably, the measuring four-wire clamp 2 is a four-wire clamp or a four-wire meter pen or a four-wire terminal or a four-wire probe.

Preferably, a compensation line 4 is further included, the compensation line 4 being connected in anti-phase series with the voltage line 12.

Preferably, the compensation line 4 can be connected in anti-phase series with the voltage line 12, either externally or/and internally to the instrument.

Preferably, when the compensation wire 4 is close to the position of the object to be measured, the position of the four-wire clamp or the four-wire pen, the four-wire terminal or the four-wire probe, and one end or/and the middle part of the compensation wire 4 are/is provided with the wire concentration device 5, so that the compensation wire 4 automatically extends and contracts along with the measurement action, and the compensation wire and the voltage loop are as same as possible.

Preferably, the wire concentrator 5 is a retractable automatic cable tightening device, and the wire concentrator 5 can reduce the magnetic flux induced voltage U1.

Example 2:

as shown in fig. 2, when the compensation line 4 is close to the object to be measured, and at the position of the four-wire clamp or the four-wire pen, or the four-wire terminal or the four-wire probe, a line concentrator 5 is arranged at one end or/and the middle part of the compensation line 4, so that the compensation line 4 automatically extends and retracts along with the measurement action, and the compensation line and the voltage loop are as same as possible.

Preferably, the line concentrator 5 is a retractable solenoid, and the line concentrator 5 can reduce the magnetic flux induced voltage U1.

Appropriate changes and modifications to the embodiments described above will become apparent to those skilled in the art from the disclosure and teachings of the foregoing description. If a plurality of serially connected measured targets are measured, the voltage line can be wound back and compensated according to the scheme, so that the interference of the same-frequency mutual inductance signal is reduced, and if the similar current line winding is adopted, the alternating magnetic flux of the current line and the compensation current line is offset, so that the mutual inductance same-frequency interference in the voltage line is reduced. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. The utility model provides a voltage line rewinding compensation four-wire system which characterized in that: the device comprises a connecting cable, a measuring four-wire clamp and a measuring circuit board, wherein one end of the connecting cable is connected with the measuring four-wire clamp, and the other end of the connecting cable is connected with the measuring circuit board.

2. A voltage line wrap compensation four wire system as claimed in claim 1, wherein: the connecting cable is composed of 2 current lines and 2 voltage lines.

3. A voltage line wrap compensation four wire system as claimed in claim 2, wherein: the current line or the voltage line is wound and wired in the fixed area of the measuring four-wire clamp to form two current and voltage coupling areas, the covering magnetic flux influence of the two areas is opposite, and induction signals caused by the alternating magnetic field of the current line automatically cancel each other.

4. A voltage line wrap compensation four wire system as claimed in claim 3, wherein: the current wire or the voltage wire is a 2-core cable.

5. A voltage line wrap compensation four wire system as claimed in claim 1, wherein: the four-wire measuring clamp is a four-wire clamp or a four-wire meter pen or a four-wire wiring terminal or a four-wire probe.

6. A voltage line wrap compensation four wire system as claimed in any one of claims 1 to 5, wherein: also included is a compensation line in anti-phase series with the voltage line.

7. A voltage line wrap compensation four wire system as claimed in claim 6, wherein: the compensation line can be connected in anti-phase series with the voltage line, either external or/and internal to the instrument.

8. A voltage line wrap compensation four wire system as claimed in claim 7, wherein: and one end or/and the middle part of the compensation line is/are provided with a line concentration device.

9. A voltage line wrap compensation four wire system as claimed in claim 8, wherein: the wire collecting device is a retractable automatic cable tightening device or a retractable solenoid.