CN102298132A - Calibrating device of grounding conduction resistance tester - Google Patents

Calibrating device of grounding conduction resistance tester Download PDF

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Publication number
CN102298132A
CN102298132A CN2011101388241A CN201110138824A CN102298132A CN 102298132 A CN102298132 A CN 102298132A CN 2011101388241 A CN2011101388241 A CN 2011101388241A CN 201110138824 A CN201110138824 A CN 201110138824A CN 102298132 A CN102298132 A CN 102298132A
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China
Prior art keywords
circuit
module circuit
resistance
voltage signal
earth
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Pending
Application number
CN2011101388241A
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Chinese (zh)
Inventor
方杰
魏鹏
张煌辉
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FUJIAN METROLOGY INSTITUTE
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FUJIAN METROLOGY INSTITUTE
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Priority to CN2011101388241A priority Critical patent/CN102298132A/en
Publication of CN102298132A publication Critical patent/CN102298132A/en
Pending legal-status Critical Current

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Abstract

The invention belongs to a calibrating device of a measurement instrument, in particular to a calibrating device of a grounding conduction resistance tester. The calibrating device of the grounding conduction resistance tester disclosed by the invention comprises a shell, an input end, an output end and a detection control circuit, wherein the detection control circuit mainly comprises a standard resistor and a voltage zooming circuit; and the input end, the standard resistor, the voltage zooming circuit and the output end are electrically connected in turn. The device disclosed by the invention has the outstanding advantages that: system error caused by high-current charged action damage of a conversion switch for a long time is avoided; one-time circuit connection is only carried out in the event of calibrating one grounding conduction resistance tester; the device is more convenient to operate by calibration persons; the error operation of the calibration persons can be reduced effectively; error in the calibration process is reduced; single standard resistor is adopted in the whole device, therefore, error resulted from the resistor is greatly reduced; the integral stability of the device is increased; and the device has the advantages of simple operation, little interference, low error and high precision.

Description

The calibrating installation of earth-continuity resistance meter
Technical field
The invention belongs to the calibrating installation of measuring instrument, especially belong to the calibrating installation of earth-continuity resistance meter
Background technology
The earth-continuity resistance meter is to be used to measure the electric equipment of AC network power supply (as household electrical appliance, electronic electric heating appliance, medical electrical equipment and measurement, control and testing laboratory's electrical installation etc.) touched metal shell and this equipment safety ground end (line) of drawing between the instrument of conducting resistance, its principle is Ohm law R=V/I, by exporting constant interchange or DC current, put between the touched metal shell and its safety ground end (line) of tested body, and measure electric current and flow through the pressure drop that measured body produces, draw the earth-continuity resistance value of tested body then by the ratio of voltage and current.
Higher as himself accuracy requirement of testing tool, normally check its precision with one group of measuring resistance, promptly allow the earth-continuity resistance meter that one group of measuring resistance that calibrating installation provides is detected, compare with testing result and standard electric resistance.The calibrating installation of present earth-continuity resistance meter mainly contains two kinds: a kind of is the rotary switch formula, its principle schematic as shown in Figure 1, calibrating installation with hundred m Ω levels, three rotary switches are arranged, rotary switch A21 correspondence 1--9m Ω range, rotary switch B22 correspondence 10--90m Ω range, rotary switch C23 correspondence 100--900m Ω range, adjust the resistance value size by rotation turn switch, after carefully connecting the wire, change the resistance of introducing in the circuit by the rotation rotary switch.And rotary switch is under conducting state, there is conducting resistance, and a plurality of rotary switches are arranged generally in the calibrating installation, be combined into the resistance that needs by resistance to each range, therefore in the various resistances, the state of switch generally is different, inevitably will introduce by " rotary switch " and bring different resistance errors, simultaneously since the earth-continuity resistance meter when being calibrated, the electric current of output is general bigger, maximum can reach 30A, and rotary switch damages in long-term hot line job easily.
Another kind is the wiring pillar, its principle schematic by connecting different binding posts 9, realizes that resistance value changes as shown in Figure 2, in calibration process, each resistance of adjusting needs outage earlier, connects wiring again, troublesome poeration, because the resistance that calibrating installation provides generally all is m Ω level, the connection resistance that the degree of tightness of tie point produces during wiring will directly count in the calibration error simultaneously, thereby reduce the accuracy of calibrating installation.
Summary of the invention
The object of the invention is to overcome the shortcoming that present earth-continuity resistance meter calibrating installation exists, and provides a kind of accuracy of detection simple to operate higher earth-continuity resistance meter calibrating installation.
The present invention is a kind of earth-continuity resistance meter calibrating installation, it comprises shell, input end, output terminal, detection control circuit, its main points are to detect control circuit and mainly comprise a measuring resistance and voltage scaling circuit, and input end, measuring resistance, voltage scaling circuit, output terminal are electrically connected in proper order.
Traditional earth-continuity resistance meter calibrating installation all is as the metering weights, calibrate with physical measure sample more accurately, the constraint of breaking conventional conception of the present invention, looking for another way only needs a measuring resistance just can simulate the resistance of various resistances by the voltage scaling circuit, owing to only use a measuring resistance, the error of being brought by resistance itself will be reduced greatly, help improving the resistance to overturning of device, and this device can simulate continuous resistance value in allowing Standard resistance range, and traditional device can only be with the minimum value stepping.
Specific design is: measuring resistance is in parallel with the voltage scaling circuit.
The voltage scaling circuit is by the voltage signal acquisition modular circuit, the kernel control module circuit, keyboard load module circuit, liquid crystal output module circuit, voltage signal generation module circuit constitutes, the voltage signal acquisition modular circuit is in parallel with measuring resistance, the voltage signal acquisition modular circuit, the kernel control module circuit, voltage signal generation module circuit is electrically connected in proper order, kernel control module circuit and keyboard load module circuit, liquid crystal output module circuit connects, needed resistance value size when the operator calibrates with the keyboard input, liquid crystal output module circuit display operation person's input.
The kernel control module circuit by operator input resistance value and calibrating installation in proportionate relationship between unique that measuring resistance resistance, be converted into the ratio of voltage scaling computing in the voltage scaling circuit, by the voltage scaling circuit, the voltage of standard resistor at two terminals is carried out convergent-divergent and exports the earth-continuity resistance meter in real time to, provide measured value by the earth-continuity resistance meter, ground connection conducting resistance tester is calibrated with this.
The present invention goes out the resistance of various resistances by the voltage scaling breadboardin with a measuring resistance, its outstanding advantage has: avoided the charged action of " switch " long-time big electric current to damage the systematic error of introducing, solved the resistance error of being introduced by " switch " switch itself; In an earth-continuity resistance meter is calibrated, only need carry out one time line, convenient calibration personnel operation can effectively reduce the maloperation of calibration personnel, reduces the error in the calibration process; Whole device adopts single measuring resistance, thereby will be reduced greatly by the error that resistance itself brings, and helps improving the resistance to overturning of device.As: when considering the global index of whole calibrating installation, resistance accuracy, the temperature of single resistance itself float etc. characteristic than a plurality of resistance control well many; This device can simulate continuous resistance value in allowing Standard resistance range, and traditional device can only be with the minimum value stepping; In the calibration process, if when needed resistance has certain rule, various resistance values can utilize programmed control to change automatically, need not manual switchover.As: on interpersonal mutual interface, can allow calibration personnel select, the resistance value step size, time delay parameter such as size, thereby reach the purpose of continuous calibrating; Volume is little, can make portablely, even under the condition that power supply allows, makes hand-held; Handled easily, calibration personnel only need button just can finish calibration after finishing wiring, and be more much smaller than the probability of maloperation, simple to operate with traditional calibrating installation, disturbs and lack, and error is little, the precision height.
Description of drawings
Fig. 1 is the principle schematic of the calibrating installation of rotary switch formula earth-continuity resistance meter
Fig. 2 is the principle schematic of the calibrating installation of wiring pillar earth-continuity resistance meter
Fig. 3 is a structural principle synoptic diagram of the present invention
Fig. 4 is user mode figure of the present invention
Fig. 5 is circuit theory diagrams of the present invention
Fig. 6 is the circuit theory diagrams of kernel control module circuit of the present invention
Fig. 7 is the circuit theory diagrams of keyboard load module circuit of the present invention
Fig. 8 is the circuit theory diagrams of liquid crystal output module circuit of the present invention
Fig. 9 is the circuit theory diagrams of voltage signal acquisition modular circuit of the present invention
Figure 10 is the circuit theory diagrams of voltage signal generation module circuit of the present invention
Wherein: 1 measuring resistance, 2 voltage signal acquisition modular circuits, 3 kernel control module circuit
4 keyboard load module circuits, 5 LCD MODULE circuit, 6 voltage signal generation module circuit
7 voltage scaling circuit, 8 shells, 9 output terminals, 10 input ends, 11 earth-continuity resistance meters
21 rotary switch A, 22 rotary switch B, 23 rotary switch C.
Embodiment
Below in conjunction with view the present invention is described in detail, this embodiment can make the professional and technical personnel more understand the present invention, but does not limit the present invention in any form.
Embodiment 1, as shown in Figure 3, a kind of earth-continuity resistance meter calibrating installation, it comprises shell 8, input end 10, output terminal 9, detects control circuit, detect control circuit and mainly comprise a measuring resistance 1, voltage scaling circuit 7, input end 10, measuring resistance 1, voltage scaling circuit 7, output terminal 9 orders are electrically connected.Measuring resistance 1 is in parallel with voltage scaling circuit 7.
As shown in Figure 4, be user mode figure of the present invention, input end 10 output terminal with earth-continuity resistance meter 11 to be calibrated is joined, the input end of output terminal 9 with earth-continuity resistance meter 11 to be calibrated joined.
As shown in Figure 5, voltage scaling circuit 7 is by voltage signal acquisition modular circuit 2, kernel control module circuit 3, keyboard load module circuit 5, liquid crystal output module circuit 4, voltage signal generation module circuit 5 constitutes, voltage signal acquisition modular circuit 2 is in parallel with measuring resistance 1, voltage signal acquisition modular circuit 2, kernel control module circuit 3, voltage signal generation module circuit 5 orders are electrically connected, kernel control module circuit 3 is connected with liquid crystal output module circuit 4 with keyboard load module circuit 5 simultaneously, the resistance value that the operator will calibrate to 3 inputs of kernel control module circuit with the keyboard input, liquid crystal output module circuit 4 display operation persons' input.
As shown in Figure 6, be the circuit theory diagrams of kernel control module circuit of the present invention, this part circuit is the core of total system, manages the work of each modular circuit as a whole.The kernel control module circuit adopts single-chip microcomputer C8051F340, carries out data communication by SPI communication mode and AD chip.Similarly available single-chip microcomputer model has a lot, as C8051F340, C8051F350, C8051F120, AD89S51, AD89S52 etc.
As shown in Figure 7, be the circuit theory diagrams of keyboard load module circuit of the present invention, one 4 * 4 keyboard circuit, with the I/O mouth of single-chip microcomputer, the P2 mouth connects, and is mainly used in to allow the user of service import relevant information.
As shown in Figure 8, be the circuit theory diagrams of liquid crystal output module circuit of the present invention, the liquid crystal circuit adopts DS12864 Chinese word library Liquid Crystal Module, is used for the current state of display device, is used for display operation person's input resistance value, prevents input error.
As shown in Figure 9, be the circuit theory diagrams of voltage signal acquisition modular circuit of the present invention, this part circuit is mainly gathered conversion with high speed 24bitAD chip ADS1258 or ADS1256, ADS1255 etc. to simulating signal, and the data that obtain are sent to single-chip microcomputer by the SPI communication mode.
As shown in figure 10, be the circuit theory diagrams of voltage signal generation module circuit of the present invention, the voltage signal generation module adopts 16 DA chip MAX542, also available MAX5631, PCM54HP etc.
Its principle of work is: the resistance value that the operator will calibrate from the keyboard input, the kernel control module circuit is compared it with the resistance of measuring resistance, draw the voltage scaling ratio, from Ohm law, by being exported steady current I to measuring resistance 1 by test examination instrument, the voltage at measuring resistance R two ends is V 1=I*R; Kernel control module circuit 3 control voltage signal acquisition modular circuits 2 are gathered voltage V from measuring resistance 1 two ends 1The voltage scale that sampling is returned is carried out conversion, and kernel control module circuit 3 control voltage signal generation module circuit 6 are exported the voltage V2 after the conversion in real time.The resistance that the earth-continuity resistance meter records is R Virtual=V 2/ I by changing the scale-up factor of conversion, changes V2, thereby simulates the resistance of various resistances.

Claims (6)

1. earth-continuity resistance meter calibrating installation, it comprises shell (8), input end (10), output terminal (9), detects control circuit, it is characterized in that: detect control circuit and mainly comprise a measuring resistance (1), voltage scaling circuit (7), input end (10), measuring resistance (1), voltage scaling circuit (7), output terminal (9) order are electrically connected.
2. the described a kind of earth-continuity resistance meter calibrating installation of claim 1, it is characterized in that: measuring resistance (1) is in parallel with voltage scaling circuit (7).
3. the described a kind of earth-continuity resistance meter calibrating installation of claim 1, it is characterized in that: voltage scaling circuit (7) is by voltage signal acquisition modular circuit (2), kernel control module circuit (3), keyboard load module circuit (5), liquid crystal output module circuit (4), voltage signal generation module circuit (5) constitutes, voltage signal acquisition modular circuit (2) is in parallel with measuring resistance (1), voltage signal acquisition modular circuit (2), kernel control module circuit (3), voltage signal generation module circuit (5) order is electrically connected, and kernel control module circuit (3) is connected with liquid crystal output module circuit (4) with keyboard load module circuit (5) simultaneously.
4. the described a kind of earth-continuity resistance meter calibrating installation of claim 3 is characterized in that: kernel control module circuit (3) can adopt single-chip microcomputer C8051F340 or C8051F340 or C8051F350 or C8051F120 or AD89S51 again or AD89S52.
5. the described a kind of earth-continuity resistance meter calibrating installation of claim 3 is characterized in that: voltage signal acquisition modular circuit (2) employing high speed 24bitAD chip ADS1258 or ADS1256.
6. the described a kind of earth-continuity resistance meter calibrating installation of claim 3 is characterized in that: 16 DA chip MAX542 of voltage signal generation module circuit (5) voltage signal generation module employing or MAX5631, PCM54HP.
CN2011101388241A 2011-05-26 2011-05-26 Calibrating device of grounding conduction resistance tester Pending CN102298132A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102998644A (en) * 2012-11-23 2013-03-27 浙江省电力公司电力科学研究院 Calibration system for direct current resistance tester
CN103605091A (en) * 2013-10-22 2014-02-26 淮安苏达电气有限公司 Grounding grid loop impedance simulation device
CN104833934A (en) * 2015-04-14 2015-08-12 北京华科兴盛电力工程技术有限公司 Ground resistance tester verifying apparatus
CN104977554A (en) * 2014-04-10 2015-10-14 陈书欣 Detection device for storage battery internal resistance tester
CN104977557A (en) * 2015-07-08 2015-10-14 南车青岛四方机车车辆股份有限公司 Device and method for calibrating contact resistance tester
CN105785303A (en) * 2016-04-19 2016-07-20 国家电网公司 Grounding ohmmeter calibrating device
CN106443549A (en) * 2016-12-08 2017-02-22 上海市计量测试技术研究院 Analog alternating current resistance device for calibrating battery internal resistance tester
CN107831369A (en) * 2017-12-19 2018-03-23 成都信息工程大学 A kind of grounding resistance monitor instrument with self-test and correction
CN109061370A (en) * 2018-09-10 2018-12-21 国网山东省电力公司潍坊供电公司 A kind of substation grounding continuity test two pointer type touch operation bar
CN109143032A (en) * 2018-09-03 2019-01-04 苏州华兴源创科技股份有限公司 A kind of circuit board self-check system
CN111308217A (en) * 2019-12-07 2020-06-19 深圳市科安达检测技术有限公司 Method and device for intelligently monitoring grounding resistance, storage medium and computer equipment

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102998644A (en) * 2012-11-23 2013-03-27 浙江省电力公司电力科学研究院 Calibration system for direct current resistance tester
CN103605091A (en) * 2013-10-22 2014-02-26 淮安苏达电气有限公司 Grounding grid loop impedance simulation device
CN103605091B (en) * 2013-10-22 2016-02-10 淮安苏达电气有限公司 Earth mat loop impedance simulation device
CN104977554A (en) * 2014-04-10 2015-10-14 陈书欣 Detection device for storage battery internal resistance tester
CN104833934B (en) * 2015-04-14 2018-05-04 北京华科兴盛电力工程技术有限公司 Earth resistance tester calibration equipment
CN104833934A (en) * 2015-04-14 2015-08-12 北京华科兴盛电力工程技术有限公司 Ground resistance tester verifying apparatus
CN104977557A (en) * 2015-07-08 2015-10-14 南车青岛四方机车车辆股份有限公司 Device and method for calibrating contact resistance tester
CN105785303A (en) * 2016-04-19 2016-07-20 国家电网公司 Grounding ohmmeter calibrating device
CN106443549B (en) * 2016-12-08 2019-09-06 上海市计量测试技术研究院 A kind of analog AC resistance device for calibration battery internal resistance test device
CN106443549A (en) * 2016-12-08 2017-02-22 上海市计量测试技术研究院 Analog alternating current resistance device for calibrating battery internal resistance tester
CN107831369A (en) * 2017-12-19 2018-03-23 成都信息工程大学 A kind of grounding resistance monitor instrument with self-test and correction
CN107831369B (en) * 2017-12-19 2020-07-03 成都信息工程大学 Grounding resistance monitor with self-checking and correcting functions
CN109143032A (en) * 2018-09-03 2019-01-04 苏州华兴源创科技股份有限公司 A kind of circuit board self-check system
CN109143032B (en) * 2018-09-03 2021-12-14 苏州华兴源创科技股份有限公司 Circuit board self-detection system
CN109061370A (en) * 2018-09-10 2018-12-21 国网山东省电力公司潍坊供电公司 A kind of substation grounding continuity test two pointer type touch operation bar
CN111308217A (en) * 2019-12-07 2020-06-19 深圳市科安达检测技术有限公司 Method and device for intelligently monitoring grounding resistance, storage medium and computer equipment

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Application publication date: 20111228