CN205176136U - Resistance test device - Google Patents

Resistance test device Download PDF

Info

Publication number
CN205176136U
CN205176136U CN201520869979.6U CN201520869979U CN205176136U CN 205176136 U CN205176136 U CN 205176136U CN 201520869979 U CN201520869979 U CN 201520869979U CN 205176136 U CN205176136 U CN 205176136U
Authority
CN
China
Prior art keywords
resistance
circuit
voltage
converter
amplifying circuit
Prior art date
Application number
CN201520869979.6U
Other languages
Chinese (zh)
Inventor
闵世像
谭春风
Original Assignee
广州开元电子科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 广州开元电子科技有限公司 filed Critical 广州开元电子科技有限公司
Priority to CN201520869979.6U priority Critical patent/CN205176136U/en
Application granted granted Critical
Publication of CN205176136U publication Critical patent/CN205176136U/en

Links

Abstract

The utility model relates to a resistance test device, including power supply vcc, reference resistance rs, is surveyed resistance rx, a voltage acquisition circuit, the 2nd voltage acquisition circuit, an amplifier circuit, the 2nd amplifier circuit, a AD converter, the 2nd AD converter and treater, reference resistance rs, surveyed resistance rx component current circuit, this current circuit's a termination power supply vcc, other end ground connection, two input cross -over connections of a voltage sampling circuit are imported to the first input end of treater behind the output series connection AD converter at reference resistance rs's both ends, two input cross -over connections of the 2nd voltage sampling circuit are imported to the second input of treater behind the 2nd AD converter of output series connection at the both ends of being surveyed resistance rx, an amplifier circuit and the 2nd amplifier circuit all include different the magnification's more than two tunnel branch road, and corresponding range is selected according to the voltage data who receives to the treater. The utility model discloses the demand journey is not shifted, measurement of efficiency is high, with low costs.

Description

A kind of resistance testing device

Technical field

The utility model relates to industrial test technical field, is specifically related to a kind of resistance testing device.

Background technology

In industrial test field, test event the most general during the test of the resistance value of element or material.Therefore industry is produced on line and is directly affected industrial efficiency to the testing efficiency of the resistance value of element or material.

Method for testing resistance conventional in prior art comprises following three kinds:

1, constant current source test mode; 2, ratio test mode; 3, bench-marking test mode.Wherein, constant current source test mode is the most frequently used mode, and flow through measurand to realize gearshift especially by different constant current sources, the corresponding voltage of measurand is corresponding with the resistance value of this measurand.Described ratio test mode is connected with measurand by reference resistance, because the electric current of node each in series circuit is identical, therefore the ratio of reference voltage and measurand equals the voltage of reference resistance and the voltage ratio of measurand, thus the resistance value of measurand can be calculated according to the resistance of magnitude of voltage corresponding to measurand, reference resistance during energising and magnitude of voltage corresponding to reference resistance.Bench-marking test mode application scenario is fewer, needs external high-precision Resistance standard, current source and high-precision voltage table, realize cost high during its test.

Utility model content

The purpose of this utility model overcomes shortcomings and deficiencies of the prior art, provide a kind of measuring accuracy high, realize the low resistance testing device of cost.

The purpose of this utility model is achieved through the following technical solutions:

A kind of resistance testing device, comprise power supply Vcc, reference resistance Rs, measured resistance Rx, the first voltage collection circuit, the second voltage collection circuit, the first amplifying circuit, the second amplifying circuit, the first AD converter, the second AD converter and processor, described reference resistance Rs, measured resistance Rx form series circuit, one termination power supply Vcc of this series circuit, other end ground connection; Two input ends of described first voltage sampling circuit are connected across the two ends of reference resistance Rs, and output terminal is connected and inputed to the first input end of processor after the first AD converter; Two input ends of described second voltage sampling circuit are connected across the two ends of measured resistance Rx, and output terminal is connected and inputed to the second input end of processor after the second AD converter; Described first amplifying circuit and the second amplifying circuit include the branch road of the above different amplification of two-way, and processor selects corresponding range according to received voltage data.By the first amplifying circuit and the second amplifying circuit, the amplification of different multiples is carried out to the sampled voltage of reference resistance Rs and measured resistance Rx, and select corresponding range by processor according to the voltage data after amplification, make the measurement of the resistance value of measured resistance Rx when not carrying out range gearshift, guarantee the precision measured, and measure that efficiency is high, to realize cost low.

Particularly, described first amplifying circuit comprises the branch road of four tunnel different amplification.

Particularly, the enlargement factor of branch road is amplified on four tunnels of described first amplifying circuit is 1 times, 10 times, 100 times and 1000 times.

Particularly, described second amplifying circuit comprises the branch road of four tunnel different amplification.

Particularly, the enlargement factor of branch road is amplified on four tunnels of described second amplifying circuit is 1 times, 10 times, 100 times and 1000 times.

Particularly, described processor is also connected with an interface circuit, is connected with PERCOM peripheral communication by interface circuit.

Particularly, described interface circuit is CAN interface circuit.

The utility model comprises following advantage and beneficial effect compared to existing technology:

The utility model carries out the amplification of different multiples by the first amplifying circuit and the second amplifying circuit to the sampled voltage of reference resistance Rs and measured resistance Rx, and select corresponding range by processor according to the voltage data after amplification, make the measurement of the resistance value of measured resistance Rx when not carrying out range gearshift, guarantee the precision measured, and measure that efficiency is high, to realize cost low.

Accompanying drawing explanation

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is the circuit theory diagrams of CAN interface circuit in embodiment.

Embodiment

Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited thereto.

Embodiment

As shown in Figure 1, a kind of resistance testing device, comprises power supply Vcc, reference resistance Rs, measured resistance Rx, the first voltage collection circuit, the second voltage collection circuit, the first amplifying circuit, the second amplifying circuit, the first AD converter, the second AD converter, processor and interface circuit.Described reference resistance Rs, measured resistance Rx form series circuit, a termination power supply Vcc of this series circuit, other end ground connection; Two input ends of described first voltage sampling circuit are connected across the two ends of reference resistance Rs, and output terminal is connected and inputed to the first input end of processor after the first AD converter; Two input ends of described second voltage sampling circuit are connected across the two ends of measured resistance Rx, and output terminal is connected and inputed to the second input end of processor after the second AD converter; Described first amplifying circuit and the second amplifying circuit include the branch road of the above different amplification of two-way, and processor selects corresponding range according to received voltage data; Described processor is by interface circuit and PERCOM peripheral communication.

As shown in Figure 2, in the present embodiment, described interface circuit is CAN interface circuit.

The utility model carries out the amplification of different multiples by the first amplifying circuit and the second amplifying circuit to the sampled voltage of reference resistance Rs and measured resistance Rx, and select corresponding range by processor according to the voltage data after amplification, make the measurement of the resistance value of measured resistance Rx when not carrying out range gearshift, guarantee the precision measured, and measure that efficiency is high, to realize cost low.

As shown in Figure 1, in the present embodiment, described first amplifying circuit employing and the second amplifying circuit include the branch road of four tunnel different amplification.Particularly, the enlargement factor of four tunnels amplification branch roads of described first amplifying circuit is 1 times, 10 times, 100 times and 1000 times, and the enlargement factor of four tunnels amplification branch roads of described second amplifying circuit is 1 times, 10 times, 100 times and 1000 times.

Such as, during concrete test, the voltage of reference resistance Rs is amplified by 1 times of amplification branch road of the first amplifying circuit, first AD converter receives the voltage of 1 times of amplification branch road of the first amplifying circuit, if the voltage that the first AD converter reads is less than 10% of its range, then the first amplifying circuit is switched to after 10 times of amplification branch roads amplify and inputs to the first AD converter; If the voltage that the first AD converter reads is less than 10% of its range, then the first amplifying circuit is switched to after 100 times of amplification branch roads amplify and inputs to the first AD converter; If the voltage that the first AD converter reads is less than 10% of its range, then the first amplifying circuit is switched to after 1000 times of amplification branch roads amplify and inputs to the first AD converter, and whether the voltage data no matter the first AD converter now receives exceedes the measured value that 10% of its range all reads current gear; If the magnitude of voltage read in the process of switching enlargement factor is greater than 10% of its range, directly read the measured value of current gear.Also can define during embody rule that to switch the threshold value of gear be other numerical value such as 15%, 20%.The measuring principle of the voltage of measured resistance Rx is identical with the voltage measurement principle of reference voltage Rs, repeats no more herein.

After reading the voltage of reference resistance Rs and measured resistance Rx, being calculated as follows of resistance value of measured resistance states formula (1):

Rx=(Urx/Grx)/((Urs/Grs)/Rs)(1)

Wherein, Urx is measured resistance magnitude of voltage, and Urs is measured resistance magnitude of voltage, and Grx is measured resistance enlargement factor, and Grs is reference resistance enlargement factor.

The magnitude of voltage of reference resistance Rs of the present utility model and the magnitude of voltage of measured resistance Rx read at synchronization, avoid not the voltage reading error that current fluctuation in the same time causes, and improve resistance testing device precision.In addition, owing to carrying out rule of three calculating by reading reference resistance Rs in testing process, and two-way amplifying circuit is symmetrical, and the drift of the drift current of circuit, variation and AD converter all counteracts, and further increases resistance testing device precision.

The above embodiment only have expressed embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.

Claims (7)

1. a resistance testing device, it is characterized in that, comprise: power supply Vcc, reference resistance Rs, measured resistance Rx, the first voltage collection circuit, the second voltage collection circuit, the first amplifying circuit, the second amplifying circuit, the first AD converter, the second AD converter and processor, described reference resistance Rs, measured resistance Rx form series circuit, one termination power supply Vcc of this series circuit, other end ground connection; Two input ends of described first voltage sampling circuit are connected across the two ends of reference resistance Rs, and output terminal is connected and inputed to the first input end of processor after the first AD converter; Two input ends of described second voltage sampling circuit are connected across the two ends of measured resistance Rx, and output terminal is connected and inputed to the second input end of processor after the second AD converter; Described first amplifying circuit and the second amplifying circuit include the branch road of the above different amplification of two-way, and processor selects corresponding range according to received voltage data.
2. resistance testing device according to claim 1, is characterized in that: described first amplifying circuit comprises the branch road of four tunnel different amplification.
3. resistance testing device according to claim 2, is characterized in that: the enlargement factor of four tunnels amplification branch roads of described first amplifying circuit is 1 times, 10 times, 100 times and 1000 times.
4. resistance testing device according to claim 1, is characterized in that: described second amplifying circuit comprises the branch road of four tunnel different amplification.
5. resistance testing device according to claim 4, is characterized in that: the enlargement factor of four tunnels amplification branch roads of described second amplifying circuit is 1 times, 10 times, 100 times and 1000 times.
6. the resistance testing device according to any one of claim 1-5, is characterized in that: described processor is also connected with an interface circuit, is connected with PERCOM peripheral communication by interface circuit.
7. resistance testing device according to claim 6, is characterized in that: described interface circuit is CAN interface circuit.
CN201520869979.6U 2015-11-02 2015-11-02 Resistance test device CN205176136U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520869979.6U CN205176136U (en) 2015-11-02 2015-11-02 Resistance test device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520869979.6U CN205176136U (en) 2015-11-02 2015-11-02 Resistance test device

Publications (1)

Publication Number Publication Date
CN205176136U true CN205176136U (en) 2016-04-20

Family

ID=55740112

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201520869979.6U CN205176136U (en) 2015-11-02 2015-11-02 Resistance test device

Country Status (1)

Country Link
CN (1) CN205176136U (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106707027A (en) * 2017-03-30 2017-05-24 漳州市东方智能仪表有限公司 Wide-range and high-resistance test circuit and method
CN106841806A (en) * 2016-12-12 2017-06-13 深圳市华力特电气有限公司 The measurement apparatus and method of a kind of rail resistance
CN108152592A (en) * 2017-12-27 2018-06-12 北京航天测控技术有限公司 A kind of lead impedance measuring system
CN108896823A (en) * 2018-07-23 2018-11-27 欣旺达电动汽车电池有限公司 A kind of method of charging resistor detection
CN110161313A (en) * 2019-06-19 2019-08-23 中南大学 The resistance high precision measuring system and method for a kind of differential method in conjunction with rule of three

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106841806A (en) * 2016-12-12 2017-06-13 深圳市华力特电气有限公司 The measurement apparatus and method of a kind of rail resistance
CN106707027A (en) * 2017-03-30 2017-05-24 漳州市东方智能仪表有限公司 Wide-range and high-resistance test circuit and method
CN108152592A (en) * 2017-12-27 2018-06-12 北京航天测控技术有限公司 A kind of lead impedance measuring system
CN108152592B (en) * 2017-12-27 2020-04-03 北京航天测控技术有限公司 Lead impedance measurement system
CN108896823A (en) * 2018-07-23 2018-11-27 欣旺达电动汽车电池有限公司 A kind of method of charging resistor detection
CN110161313A (en) * 2019-06-19 2019-08-23 中南大学 The resistance high precision measuring system and method for a kind of differential method in conjunction with rule of three

Similar Documents

Publication Publication Date Title
CN103412202B (en) A kind of method of electric current by stages calibration
CN102628892B (en) Method for calculating voltage-loss unusual electrical energy measurement on line and electric energy meter
CN201993124U (en) Multi-channel physical quantity measuring device
CN103698579B (en) Low voltage frequency converter DC voltage sampling apparatus
CN103560760B (en) Amplifying circuit and measuring device
CN102426285B (en) Current sensor used for bidirectional current sampling
CN104749537A (en) Hysteresis loop measuring method of current transformer
CN203882224U (en) Program-controlled constant-current source circuit
CN102854366B (en) Low current measuring device and low current measuring method in direct-current power distribution and consumption system
CN101295188A (en) DC small current constant-current source and calibration method thereof
CN202928716U (en) High precision intelligent temperature measurement circuit
CN104254784A (en) Sensor device
CN103235189B (en) A kind of micro-resistance high-precision measuring method based on double-current voltage ratio method and realize the measuring system of the method
CN104460803A (en) Band-gap reference voltage generating circuit
CN201732112U (en) Voltage sensor for locomotives
CN102692883B (en) An analog input circuit for engineering-machinery-dedicated controller
CN103323100B (en) Vibration amplitude measuring circuit
CN104246526A (en) Sensor device
CN102075150B (en) Photoelectric signal preconditioning amplifying circuit of auto iris for digital gastrointestinal machine
CN103412168B (en) A kind of high-precision current sampling circuit of intelligent electric meter
CN102323466A (en) Weak signal acquisition and processing circuit
CN203216997U (en) On-line detector for ground resistor
CN102841260A (en) DC microresistivity measuring system
CN103257324A (en) Magnetic sensor device
CN102331517A (en) Inductive current detection circuit and DC-DC (direct current to direct current) power switch converter

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20160420

Termination date: 20181102