CN218383059U - High-precision test system for load stability of sampling resistor - Google Patents
High-precision test system for load stability of sampling resistor Download PDFInfo
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- CN218383059U CN218383059U CN202222621962.1U CN202222621962U CN218383059U CN 218383059 U CN218383059 U CN 218383059U CN 202222621962 U CN202222621962 U CN 202222621962U CN 218383059 U CN218383059 U CN 218383059U
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- sampling resistor
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Abstract
The utility model relates to a load stability high accuracy test system of sampling resistor, include: the device comprises an output power supply, a standard resistor, a first voltage detection device and a second voltage detection device; the output power supply, the standard resistor and the sampling resistor form a series circuit; the first voltage detection device detects the voltage of the standard resistor; the second voltage detection device detects the voltage of the sampling resistor; the high-precision test system for the load stability of the sampling resistor further comprises a real-time current calculation device and a sampling resistor resistance value calculation device; the real-time current calculating device is connected with the first voltage detecting device; the sampling resistance value calculating device is respectively connected with the second voltage detecting device and the real-time current calculating device. The utility model discloses a sampling resistor's load stability high accuracy test system adopts the lower precision rank power can realize the high accuracy test result of sampling resistor load stability, and test system realizes with low costs.
Description
Technical Field
The utility model relates to a sampling resistor tests technical field, especially relates to a sampling resistor's load stability high accuracy test system.
Background
In the prior art, when a sampling resistor is subjected to a load stability test, a high-precision power supply and a high-precision voltmeter are generally adopted for the load stability test. The test mode has very high requirement on the precision of the tested high-precision power supply. However, higher precision levels of power supplies are more expensive. When the precision requirement of the test result of the stability of the sampling resistance load reaches two ten-thousandth, the precision requirement of the power supply and the voltage for testing the stability of the sampling resistance load at least reaches two hundred-thousandth precision. I.e. the accuracy of the test equipment is at least an order of magnitude higher than the accuracy of the test results. The price of the equipment is multiplied when the precision of the power supply used for testing is improved by one level.
This makes the precision requirement of the test equipment higher and higher when the precision requirement of the test result is high, which makes the cost of the test equipment very high.
Moreover, the existing test equipment can only be specially used for a special machine, and the flexibility is poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the weak point among the prior art, providing a sampling resistor's load stability high accuracy test system, adopt lower precision rank's power can realize sampling resistor load stability's high accuracy test result, test system realizes with low costs.
The purpose of the utility model is realized through the following technical scheme:
a high-precision test system for load stability of a sampling resistor comprises: the device comprises an output power supply, a standard resistor, a first voltage detection device and a second voltage detection device;
the output power supply, the standard resistor and the sampling resistor form a series loop;
the first voltage detection device detects the voltage of the standard resistor; the second voltage detection device detects the voltage of the sampling resistor;
the high-precision test system for the load stability of the sampling resistor further comprises a real-time current calculation device and a sampling resistor resistance value calculation device; the real-time current calculating device is connected with the first voltage detecting device; and the sampling resistance value calculating device is respectively connected with the second voltage detecting device and the real-time current calculating device.
In a preferred embodiment, the high-precision test system for the load stability of the sampling resistor further comprises a constant temperature mechanism, and the constant temperature mechanism is used for keeping the standard resistor at a constant temperature.
In a preferred embodiment, the thermostatic mechanism is an oven, and the standard resistor is disposed in the oven.
In a preferred embodiment, the output power source 200 is a linear dc power source.
In a preferred embodiment, the standard resistance of the output power supply is 0.01m Ω.
In a preferred embodiment, the first voltage detection device is a 7-bit half-digital multimeter.
In a preferred embodiment, the second voltage detection device is a 7-bit half-digital multimeter.
The utility model discloses an introduce standard resistance as the inspection benchmark of precision in the system, rather than regard output power source as the inspection standard of precision to reduced output power source's required precision rank, and then reduced detecting system's cost by a wide margin.
Furthermore, the utility model discloses a detecting system builds in a flexible way, in the requirement of difference, can change the part of system in a flexible way, can be applicable to the test occasion of different requirements in a flexible way.
The utility model keeps the standard resistor in a constant temperature state through the constant temperature box, thereby improving the stability of the resistance value of the standard resistor on the one hand and improving the reliability of the detection system; on the other hand, the mode of keeping the standard resistor at constant temperature through the constant temperature box realizes simple structure and low realization cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is an overall schematic diagram of the high-precision test system for load stability of the sampling resistor of the present invention;
fig. 2 is the utility model discloses a sampling resistor's load stability high accuracy test system's circuit principle schematic diagram.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, the utility model provides a sampling resistor's load stability high accuracy test system 100, include: an output power source 200, a standard resistor 300, a first voltage detection device 400 and a second voltage detection device 500. The output power source 200, the standard resistor 300 and the sampling resistor 800 form a series circuit. The first voltage detection means 400 detects the voltage of the reference resistor 300. The second voltage detection means 500 detects the voltage of the sampling resistor.
As shown in fig. 1, the high-precision test system 100 for load stability of a sampling resistor further includes a real-time current calculating device 600 and a sampling resistor resistance calculating device 700. The real-time current calculating device 600 is connected to the first voltage detecting device 400. The sampling resistance calculation device 700 is connected to the second voltage detection device 500 and the real-time current calculation device 600, respectively.
As a preferred embodiment, the high-precision test system 100 for load stability of the sampling resistor further includes a constant temperature mechanism, and the constant temperature mechanism performs constant temperature on the standard resistor 300.
In the present embodiment, the thermostatic mechanism is an oven, and the standard resistor 300 is provided in the oven.
In this embodiment, the output power source 200 is a linear DC power source DC, and the standard resistance of the output power source 200 is 0.01m Ω.
In the present embodiment, the first voltage detection device 400 employs a 7-bit half-digital multimeter. The second voltage detection device 500 is a 7-bit half-digital multimeter.
The working principle of the sampling resistor load stability high-precision testing system 100 is described below (see fig. 1 and 2):
in the operation process of the test system 100, the output power supply 200 provides a load for the whole system 100; in the testing process, the current of a loop formed by the output power supply 200, the sampling resistor and the standard resistor 300 is equal everywhere;
the first voltage detection device 400 detects the standard voltage value at two ends of the standard resistor 300 in real time and inputs the standard voltage value to the real-time current calculation device 600; the real-time current calculating device 600 calculates the real-time current according to the standard voltage value and the resistance value of the standard resistor 300, and transmits the real-time current to the sampling resistor resistance value calculating device 700;
meanwhile, the first voltage detection device 400 detects the sampling voltage values at both ends of the sampling resistor in real time, and inputs the sampling voltage values to the sampling resistor resistance value calculation device 700; the sampling resistor resistance value calculation device 700 calculates the real-time sampling resistor resistance value of the sampling resistor 800 according to the sampling voltage value and the real-time current; therefore, the resistance value change of the sampling resistor 800 is calculated in real time, and an accurate value of the stability change of the sampling resistor 800 in the process of constant load (namely the load stability of the sampling resistor 800) is obtained.
The utility model discloses an introduce standard resistance 300 in system 100 as the inspection benchmark of precision, rather than regard output power supply 200 as the inspection standard of precision to the required accuracy grade of output power supply 200 has been reduced, and then the cost of detecting system 100 has been reduced by a wide margin.
Moreover, the utility model discloses a detecting system 100 builds in a flexible way, in the requirement of difference, can change system 100's part in a flexible way, can be applicable to the test occasion of different requirements in a flexible way.
The utility model keeps the standard resistor 300 in a constant temperature state through the constant temperature box, on one hand, the resistance stability of the standard resistor 300 is improved, and the precision of the detection system 100 is further improved; on the other hand, the constant temperature mode of the constant temperature box is adopted, the structure is simple, and the realization cost is low.
As shown in fig. 2, the output power source 200 is a linear DC power source DC, and its standard resistance is 0.01m Ω; the first voltage detection device 400 adopts a 7-bit half-digital multimeter, and the second voltage detection device 500 adopts a 7-bit half-digital multimeter;
the resistance value of the standard resistor 300 is R1, and the resistance value of the sampling resistor 800 is R2; the first voltage detection device 400 detects that the real-time voltage at two ends of the standard resistor 300 is V1; the second voltage detection device 500 detects that the real-time voltage at the two ends of the sampling resistor 800 is V2;
the real-time current calculating device 600 calculates the real-time current I1 in the loop through the information of the standard resistor 300: i1= V1/R1;
in the embodiment, the real-time current calculating device 600 uses a PLC (programmable logic controller) to perform signal reading and conversion calculation;
since the currents in the series loop are equal everywhere, the current I2= I1= V1/R1 flowing through the sampling resistor 800;
the sampling resistor resistance value calculation device 700 calculates the real-time resistance value R2 of the sampling resistor 800: r2= V2/I2;
namely, the real-time resistance value R2= V2/I1 of the sampling resistor 800;
the utility model discloses a test system can read sampling resistor 800's real-time resistance R2 among the load process in real time to judge sampling resistor 800's stability and load back resistance R2's change.
The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (7)
1. The utility model provides a high accuracy test system of load stability of sampling resistance which characterized in that includes: the device comprises an output power supply, a standard resistor, a first voltage detection device and a second voltage detection device;
the output power supply, the standard resistor and the sampling resistor form a series loop;
the first voltage detection device detects the voltage of the standard resistor; the second voltage detection device detects the voltage of the sampling resistor;
the high-precision test system for the load stability of the sampling resistor further comprises a real-time current calculation device and a sampling resistor resistance value calculation device; the real-time current calculating device is connected with the first voltage detecting device; and the sampling resistance value calculating device is respectively connected with the second voltage detecting device and the real-time current calculating device.
2. The sampling resistor load stability high-precision testing system according to claim 1, further comprising a constant temperature mechanism, wherein the constant temperature mechanism is used for keeping the standard resistor at a constant temperature.
3. The system for testing the load stability and the high precision of the sampling resistor according to claim 2, wherein the constant temperature mechanism is an incubator, and the standard resistor is arranged in the incubator.
4. The system for testing the load stability and the high accuracy of the sampling resistor according to claim 1, wherein the output power supply is a linear direct current power supply.
5. The system for testing the load stability and the high precision of the sampling resistor according to claim 4, wherein the standard resistor of the output power supply is 0.01m Ω.
6. The system for testing the load stability and the high accuracy of the sampling resistor according to claim 1, wherein the first voltage detection device is a 7-bit half-digital multimeter.
7. The system for testing the load stability and the high precision of the sampling resistor according to claim 1, wherein the second voltage detection device is a 7-bit half-digital multimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222621962.1U CN218383059U (en) | 2022-09-30 | 2022-09-30 | High-precision test system for load stability of sampling resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222621962.1U CN218383059U (en) | 2022-09-30 | 2022-09-30 | High-precision test system for load stability of sampling resistor |
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| Publication Number | Publication Date |
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| CN218383059U true CN218383059U (en) | 2023-01-24 |
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| CN202222621962.1U Active CN218383059U (en) | 2022-09-30 | 2022-09-30 | High-precision test system for load stability of sampling resistor |
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| CN (1) | CN218383059U (en) |
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2022
- 2022-09-30 CN CN202222621962.1U patent/CN218383059U/en active Active
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