CN217820803U

CN217820803U - Multi-wire system compatible resistance measurement calibration tool supporting real-time self-calibration

Info

Publication number: CN217820803U
Application number: CN202221329700.1U
Authority: CN
Inventors: 张世达; 李文林; 廖越
Original assignee: Shanghai Jianyi Technology Co ltd
Current assignee: Shanghai Jianyi Technology Co ltd
Priority date: 2022-05-30
Filing date: 2022-05-30
Publication date: 2022-11-15
Anticipated expiration: 2032-05-30

Abstract

The utility model relates to an electronic measurement technical field specifically is a support compatible resistance measurement calibration instrument of multi-wire system of real-time self calibration, include: the device comprises a positive measurement bus, a positive excitation bus, a negative measurement bus, a reference resistor, a change-over switch A, an ohmmeter, a signal interface A, a change-over switch B, a signal interface B, a change-over switch C, a controller and a control bus interface. The utility model discloses can produce the required quilt of resistance measurement equipment calibration through the series-parallel connection mode of difference and survey the reference resistance, can simulate multiple resistance, but often only need a few resistance values in practical application, too complicated structure is at the cost, can demonstrate the disadvantage in the performance, the scale and the complexity of system have been reduced by a wide margin, the cost has also been reduced simultaneously, and guarantee through the real-time mode of calibrating of ohmmeter that the reference resistance value is accurate reliable, simple resistance structure is the accuracy when also more being favorable to measuring simultaneously.

Description

Multi-wire compatible resistance measurement calibration tool supporting real-time self calibration

Technical Field

The utility model relates to an electronic measurement technical field specifically is a support compatible resistance measurement calibration instrument of multi-wire system of real-time self calibration.

Background

The resistance measurement calibration tool needs to provide a relatively accurate resistance value for a calibrated device, and as shown in fig. 1, the resistance measurement calibration tool is a schematic structural diagram of a resistance measurement tool in the prior art, and includes a controller a, a programmable resistance matrix B, and an output interface C, where the programmable resistance matrix B is a complex resistance matrix formed by connecting a certain amount of fixed value resistors and controllable switches in series and in parallel, switches in the programmable resistance matrix B can be configured to different combination states under the control of the controller a, and the overall resistance value of the programmable resistance matrix B changes accordingly, when in use, the controller a controls the programmable resistance matrix B to maintain a resistance value required for calibration, and the calibrated device measures the resistance value of the resistance matrix B through the output interface C and compares the resistance value with a current set value of the electric saw matrix B to obtain a calibration result.

At present, the existing resistance measuring tool needs to use a complex integrated electronic circuit, the cost is high, the volume is large, the number of resistors and switches in the prior art is large, and the measuring precision and the temperature drift of the resistors are difficult to control. In view of this, we propose a multi-wire compatible resistance measurement calibration tool that supports real-time self-calibration.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a support the compatible resistance measurement calibration instrument of multi-wire system of real-time self calibration to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a multi-wire compatible resistance measurement calibration tool supporting real-time self-calibration, comprising: the device comprises a positive measurement bus, a positive excitation bus, a negative measurement bus, a reference resistor, a change-over switch A, an ohmmeter, a signal interface A, a change-over switch B, a signal interface B, a change-over switch C, a controller and a control bus interface; wherein:

the negative terminal of the reference resistor is connected with the gate A and the gate B of the change-over switch A through two leads, and the gate A and the gate B of the change-over switch A are sequentially connected with the negative measurement bus and the negative excitation bus; the positive terminal of the reference resistor is connected with the gate C and the gate D of the change-over switch A through two leads, and the gate C and the gate D of the change-over switch A are sequentially connected with the positive excitation bus and the positive measurement bus;

four wiring terminals of the ohmmeter are respectively connected to four wiring ports of the signal interface A through leads, the four wiring ports of the signal interface A are respectively connected with an A gate, a B gate, a C gate and a D gate of the change-over switch B, and the A gate, the B gate, the C gate and the D gate of the change-over switch B are sequentially connected with the negative measurement bus, the negative excitation bus, the positive excitation bus and the positive measurement bus;

four wiring terminals of the signal interface B are respectively connected to the gate A, the gate B, the gate C and the gate D of the change-over switch C, and the gate A, the gate B, the gate C and the gate D of the change-over switch C are sequentially connected with the negative measurement bus, the negative excitation bus, the positive excitation bus and the positive measurement bus;

and the controller controls the switching-on of the change-over switch A, the change-over switch B and the change-over switch C through the control junction interface.

Preferably, the resistance values of the positive measurement bus, the positive excitation bus, the negative excitation bus and the negative measurement bus are less than 0.01 Ω.

Preferably, the rated current of the signal interface A and the rated current of the signal interface B are not less than 0.1A.

Preferably, the ohmmeter is one of a 4-wire ohmmeter, a multimeter and an LCR meter.

Preferably, the reference resistance is one of a metal wire resistor, a thin film resistor, a thick film resistor, a metal oxide resistor and a carbon resistor, and the temperature drift is less than 50ppm.

Preferably, the controller is one of a microcontroller, a digital signal processor, a programmable logic gate array and a programmable logic controller.

Compared with the prior art, the beneficial effects of the utility model are that: this support compatible resistance measurement calibration instrument of multi-wire system of real-time self calibration, can produce the required benchmark resistance of being surveyed of resistance measurement equipment calibration through different series-parallel connection modes, can simulate multiple resistance, but often only need a few resistance values in practical application, too complicated structure can show the disadvantage in cost, performance, the scale and the complexity of system have been reduced by a wide margin, the cost has also been reduced simultaneously, and guarantee that benchmark resistance value is accurate reliable through the real-time mode of calibration of ohmmeter, simple resistance structure is also more favorable to the accuracy when measuring simultaneously.

Drawings

FIG. 1 is a schematic diagram of a prior art resistance measuring tool;

fig. 2 is a schematic diagram of the overall structure of the present invention.

In the figure: 1. a positive measurement bus; 2. a positive excitation bus; 3. a negative excitation bus; 4. a negative measurement bus; 5. a reference resistance; 6. a changeover switch A; 7. an ohmmeter; 8. a signal interface A; 9. a changeover switch B; 10. a signal interface B; 11. a changeover switch C; 12. a controller; 13. and controlling a bus interface.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

A multi-wire compatible resistance measurement calibration tool that supports real-time self-calibration, as shown in fig. 2, comprising: the device comprises a positive measurement bus 1, a positive excitation bus 2, a negative excitation bus 3, a negative measurement bus 4, a reference resistor 5, a selector switch A6, an ohmmeter 7, a signal interface A8, a selector switch B9, a signal interface B10, a selector switch C11, a controller 12 and a control bus interface 13; wherein:

the negative terminal of the reference resistor 5 is connected with the gate A and the gate B of the change-over switch A6 through two wires, and the gate A and the gate B of the change-over switch A6 are sequentially connected with the negative measurement bus 4 and the negative excitation bus 3; the positive terminal of the reference resistor 5 is connected with the gate C and the gate D of the change-over switch A6 through two wires, and the gate C and the gate D of the change-over switch A6 are sequentially connected with the positive excitation bus 2 and the positive measurement bus 1;

four wiring terminals of the ohm meter 7 are respectively connected to four wiring ports of a signal interface A8 through wires, the four wiring ports of the signal interface A8 are respectively connected with an A gate, a B gate, a C gate and a D gate of a change-over switch B9, and the A gate, the B gate, the C gate and the D gate of the change-over switch B9 are sequentially connected with a negative measurement bus 4, a negative excitation bus 3, a positive excitation bus 2 and a positive measurement bus 1;

four terminals of the signal interface B10 are respectively connected to the gate A, the gate B, the gate C and the gate D of the selector switch C11, and the gate A, the gate B, the gate C and the gate D of the selector switch C13 are sequentially connected with the negative measurement bus 4, the negative excitation bus 3, the positive excitation bus 2 and the positive measurement bus 1;

the controller 12 controls the closing of the switch A6, the switch B9 and the switch C11 by controlling the bus interface 13.

Furthermore, the positive measurement bus 1, the positive excitation bus 2, the negative excitation bus 3 and the negative measurement bus 4 are used for connecting buses of the positive electrode and the negative electrode of measurement signals of all related components, are formed by using copper alloy, silver alloy, gold alloy, pure gold and pure copper wires, and have a resistance value of less than 0.01 omega.

It is worth mentioning that the signal interface A8 and the signal interface B10 are 4pin electrical interfaces for connecting an external calibrated resistance measuring device and the ohmmeter 7, which may be of the type of screw terminal, pin header, or aviation plug, and have a rated current of not less than 0.1A.

Specifically, the ohmmeter 7 is one of a 4-wire ohmmeter, a multimeter, and an LCR meter, and is used for calibrating the current reference resistance 5 in real time.

Further, the reference resistance 5 is a fixed value resistor for providing resistor information for calibration, is one of a metal wire resistor, a thin film resistor, a thick film resistor, a metal oxide resistor, and a carbon resistor, and has a temperature drift of less than 50ppm.

Specifically, the controller 12 is a control unit with logic control capability, and is one of a microcontroller, a digital signal processor, a programmable logic gate array and a programmable logic controller, the controller 12 has single-ended digital signal output capability, the signal level is between 3.3V and 24V, and the number of single-ended signal channels is not less than the total number of the switches.

It should be noted that the reference resistor 5 and its associated switch A6, and the signal interface A8 and its associated switch B9 may be provided with one or more sets, and the resistance measurement device is calibrated for multiple times by using a plurality of reference resistors 5 with different resistances, so as to obtain a calibration table or calibration curve.

When the multi-wire compatible resistance measurement and calibration tool supporting real-time self-calibration is used, all the switches A6, B9 and C11 are switched to an open state through the controller 12, then one reference resistor 5 is selected to switch the switch A6 connected with the reference resistor 5 and the switch B9 connected with the ohmmeter 7 to a closed state, at this time, the measurement result of the ohmmeter 7 is read and recorded, the switch B9 connected with the ohmmeter 7 is disconnected, the switch C11 corresponding to one signal interface B10 connected with external resistance measurement equipment to be calibrated is opened, at this time, the external resistance measurement equipment to be calibrated connected to the signal interface B10 is connected with the selected reference resistor 5, the measurement result is read by using the calibrated resistance measurement equipment, and is compared with the previously recorded measurement result of the ohmmeter 7, so that the error of the resistance measurement equipment under the current input condition can be obtained.

According to the calibration requirement, the resistance measuring equipment can be calibrated for many times by switching a plurality of reference resistors 8 with different resistance values, so that a calibration table or a calibration curve is obtained, and a plurality of connected resistance measuring equipment to be calibrated can be measured by circulating the above process.

Compared with the prior art, the utility model discloses can produce the required quilt of resistance measurement equipment calibration through the series-parallel mode of difference and survey the reference resistance, can simulate multiple resistance, but often only need a few resistance values in practical application, too complicated structure is at the cost, can demonstrate the disadvantage in the performance, the scale and the complexity of system have been reduced by a wide margin, the cost has also been reduced simultaneously, and guarantee the accurate reliability of reference resistance value through the mode of ohmmeter real-time calibration, simple resistance structure is accurate when also more being favorable to measuring simultaneously.

The foregoing shows and describes the basic principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A multi-wire compatible resistance measurement calibration tool that supports real-time self-calibration, comprising: the device comprises a positive measurement bus (1), a positive excitation bus (2), a negative excitation bus (3), a negative measurement bus (4), a reference resistor (5), a change-over switch A (6), an ohmmeter (7), a signal interface A (8), a change-over switch B (9), a signal interface B (10), a change-over switch C (11), a controller (12) and a control bus interface (13); wherein:

the negative terminal of the reference resistor (5) is connected with the gate A and the gate B of the change-over switch A (6) through two wires, and the gate A and the gate B of the change-over switch A (6) are sequentially connected with the negative measurement bus (4) and the negative excitation bus (3); the positive terminal of the reference resistor (5) is connected with the gate C and the gate D of the change-over switch A (6) through two wires, and the gate C and the gate D of the change-over switch A (6) are sequentially connected with the positive excitation bus (2) and the positive measurement bus (1);

four wiring terminals of the ohm meter (7) are respectively connected to four wiring ports of the signal interface A (8) through wires, the four wiring ports of the signal interface A (8) are respectively connected with an A gate, a B gate, a C gate and a D gate of the change-over switch B (9), and the A gate, the B gate, the C gate and the D gate of the change-over switch B (9) are sequentially connected with the negative measurement bus (4), the negative excitation bus (3), the positive excitation bus (2) and the positive measurement bus (1);

four terminals of the signal interface B (10) are respectively connected to the gate A, the gate B, the gate C and the gate D of the change-over switch C (11), and the gate A, the gate B, the gate C and the gate D of the change-over switch C (11) are sequentially connected with the negative measurement bus (4), the negative excitation bus (3), the positive excitation bus (2) and the positive measurement bus (1);

and the controller (12) controls the switching-on of the change-over switch A (6), the change-over switch B (9) and the change-over switch C (11) through the control collection line interface (13).

2. The multi-wire compatible resistance measurement calibration tool supporting real-time self-calibration according to claim 1, wherein: the resistance values of the positive measurement bus (1), the positive excitation bus (2), the negative excitation bus (3) and the negative measurement bus (4) are less than 0.01 omega.

3. The multi-wire compatible resistance measurement calibration tool supporting real-time self-calibration according to claim 1, wherein: and rated currents of the signal interface A (8) and the signal interface B (10) are not less than 0.1A.

4. The tool of claim 1 for supporting real-time self-calibration, multi-wire compatible resistance measurement calibration, wherein: the ohmmeter (7) is one of a 4-wire ohmmeter, a multimeter and an LCR meter.

5. The tool of claim 1 for supporting real-time self-calibration, multi-wire compatible resistance measurement calibration, wherein: the reference resistor (5) is one of a metal winding resistor, a thin film resistor, a thick film resistor, a metal oxide resistor and a carbon resistor, and the temperature drift is less than 50ppm.

6. The tool of claim 1 for supporting real-time self-calibration, multi-wire compatible resistance measurement calibration, wherein: the controller (12) is one of a microcontroller, a digital signal processor, a programmable logic gate array, and a programmable logic controller.