CN101650388A - Measuring device and method of human body resistance under DC current - Google Patents
Measuring device and method of human body resistance under DC current Download PDFInfo
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- CN101650388A CN101650388A CN200910063993A CN200910063993A CN101650388A CN 101650388 A CN101650388 A CN 101650388A CN 200910063993 A CN200910063993 A CN 200910063993A CN 200910063993 A CN200910063993 A CN 200910063993A CN 101650388 A CN101650388 A CN 101650388A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 claims description 31
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052802 copper Inorganic materials 0.000 claims description 12
- 239000010949 copper Substances 0.000 claims description 12
- 239000012267 brine Substances 0.000 claims description 10
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 13
- 238000005070 sampling Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 208000014674 injury Diseases 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000001983 electron spin resonance imaging Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
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Abstract
The invention discloses measuring device and method of human body resistance under DC current. The measuring device comprises a DC power supply, an ammeter, a voltmeter, an A/D switching circuit, a main controller, a liquid crystal display and a contact conduction mechanism, wherein the A/D switching circuit, the main controller and the liquid crystal display are sequentially connected; the voltmeter and the ammeter are both connected with the main controller through the A/D switching circuit; the contact conduction mechanism is in contact with human feet when the measurement is performed, andconsists of two insulated containers containing a conductive solution and electrode plates; the electrode plates are dipped into the conductive solution and positioned on the internal bottom of the insulated containers; the electrode plates inside one insulated container are electrically connected with one end of the DC power supply; the electrode plates inside the other insulated container are electrically connected with the other end of the DC power supply; and the electrode plate inside one insulated container is electrically connected with one end of the voltmeter, and the other electrodeplate is electrically connected with the other end of the voltmeter. The measuring device has the advantages of portability, convenient operation, correct measurement and high safety performance. Theinvention also provides the measuring method which corresponds to the measuring device.
Description
Technical field
The present invention relates to human body resistance device and measuring method, particularly relate to human body resistance device and measuring method under a kind of DC current.
Background technology
Electric shock accidents occupy the first in a large amount of security incidents.Some people (especially women) is relatively responsive to electricity, and also some people compares more bluntly, even in same electric shock accidents, the weight of the condition of the injury also varies with each individual, and these phenomenons are all with a key factor---human body resistance is relevant.When research power system security voltage, it is found that identical voltage exists different danger to different human body resistances, therefore measure human body resistance for definite safe voltage, how to avoid the people to get an electric shock significant.
Abroad to the value of human body resistance, all be the recommendation with reference to U.S. EPRI usually at present, U.S. EPRI recommends the resistance value between two pin of human body to get 1000 Ω.The present domestic large-scale human body resistance test of not carrying out specially as yet, therefore those skilled in the art demand urgently developing easy to use, measure human body resistance device and measuring method accurately, full and accurate human body resistance related data is obtained in measurement, for the design of related electric device ' provides foundation, to reduce the generation of electric shock accidents.Simultaneously, this measure is to China's direct current grounding pole step voltage design, and the scientific research and testing data of enriching China's DC earthing all are significant.
Before this, publication number is that the Chinese invention patent of CN1528239A discloses a kind of human body resistance circuit, and it comprises by operational amplifier, the electric capacity that is attempted by the operational amplifier inverse output terminal and electrode, is attempted by the operational amplifier resistance of output terminal and the self-maintained circuit that electrode constitutes in the same way; By NPN transistor and the resistance that is serially connected in respectively on NPN transistor base stage and the collector constitute waveform shaping circuit; The output voltage terminal of the operational amplifier of self-maintained circuit is connected with the base stage of the NPN transistor of waveform shaping circuit, and the NPN transistor collector also is connected to signal output part.It only can go out human body resistance by rough measure.Because human body resistance is a unfixed numerical value, electrode and human body contact resistance relation are very big during with measurement, and its variation range can change between several megohms from several ohm.Existing human body resistance circuit not only complicated operation, inconvenience carries, and measuring error is big, security performance is relatively poor.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of above-mentioned background technology, provide a kind of and be easy to carry about with one, easy to operate, measure accurately, human body resistance device and measuring method under the DC current that security performance is higher.
Human body resistance device under the DC current provided by the invention, comprise direct supply, reometer, voltage table and the A/D change-over circuit that connects in turn, master controller, LCD, described voltage table, reometer all links to each other with master controller by the A/D change-over circuit, it also comprises the contact conducting mechanism that contacts with the human body both feet when measuring, described contact conducting mechanism is made of the insulating vessel of two built-in conducting solutions and battery lead plate, described battery lead plate is dipped in the conducting solution, and be in the inner bottom part of insulating vessel, the interior battery lead plate of insulating vessel is electrically connected with an end of described direct supply, battery lead plate in another insulating vessel is electrically connected with the other end of described direct supply by described reometer, the interior battery lead plate of insulating vessel is electrically connected with an end of described voltage table, and the battery lead plate in another insulating vessel is electrically connected with the other end of described voltage table.
In technique scheme, described conducting solution employing mass percent is 10% brine solution, and solution deep is 3～5 millimeters; Described battery lead plate adopts the copper electrode plate; Described insulating vessel adopts plastic material to make.
In technique scheme, be connected with switch in described direct supply, reometer and the formed loop of measured human body, described direct supply adopts adjustable constant voltage dc source, and its voltage-regulation scope is 0～55V, and output current scope is 0～30mA.
The present invention also provides the method for the human body resistance under a kind of DC current, may further comprise the steps: measured human body both feet place two insulating vessel inner bottom parts to be immersed on the battery lead plate of conducting solution respectively, the loop that conducting is formed by resistance, reometer, direct supply between measured human body both feet, a resistance two ends voltage table in parallel between the measured human body both feet in this loop; The electric current that reometer, voltage table collect, voltage signal are sent into master controller respectively after the A/D conversion process, master controller is according to Ohm law, the electric current after the A/D conversion process, the voltage signal that receives calculated, draw resistance between measured personnel's both feet, as measured personnel's human body resistance value, by this human body resistance value of liquid crystal display displays.
In technique scheme, described conducting solution employing mass percent is 10% brine solution, and solution deep is 3～5 millimeters; Described battery lead plate adopts the copper electrode plate; Described insulating vessel adopts plastic material to make.
The invention has the advantages that:
When 1, the human body resistance device under the use DC current provided by the invention is measured, it is in 10% the salt solution that surface of contact between people's pin and the battery lead plate is immersed mass percent, reduced the contact resistance between people's pin and the battery lead plate, made measurement more accurate;
2, the human body resistance device under the DC current provided by the invention, it is convenient not only to measure, and in light weight, volume is little, be easy to carry about with one;
3, the human body resistance device under the DC current provided by the invention, maximum output current is 30mA, and human body is not had injury, security performance is higher;
4, the human body resistance device under the DC current provided by the invention can also be measured the human perception electric current when measuring human body resistance, for the design of related electric device ' provides more foundations.
Description of drawings
Fig. 1 is the wiring schematic diagram of the human body resistance device under the DC current of the present invention;
Fig. 2 is the structured flowchart of the human body resistance device under the DC current of the present invention;
Fig. 3 is the circuit theory diagrams of the human body resistance device under the DC current of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples, but this embodiment should not be construed as limitation of the present invention.
The IEC of International Electrotechnical Commission publication (1974-479) thinks that under the situation of direct current and power frequency, human body resistance can be considered a noninductive resistance, and this resistance typically refers between people's hand to two pin, or from a pin to the resistance the another pin.Resistance is as human body resistance between embodiment of the invention employing human body both feet.
Referring to illustrated in figures 1 and 2, human body resistance device under the DC current that the embodiment of the invention provides, comprise direct supply, reometer, voltage table and the A/D change-over circuit that connects in turn, master controller, LCD, voltage table, reometer all links to each other with master controller by the A/D change-over circuit, it also comprises the contact conducting mechanism that contacts with the human body both feet when measuring, contact conducting mechanism is made of the insulating vessel of two built-in conducting solutions and battery lead plate, battery lead plate is dipped in the conducting solution, and be in the inner bottom part of insulating vessel, conducting solution employing mass percent is 10% brine solution, and solution deep is 3～5 millimeters; Battery lead plate adopts the copper electrode plate; The container that insulating vessel adopts plastic material to make.The interior battery lead plate of insulating vessel is electrically connected with an end of described direct supply, battery lead plate in another insulating vessel is electrically connected with the other end of described direct supply by described reometer, the interior battery lead plate of insulating vessel is electrically connected with an end of described voltage table, and the battery lead plate in another insulating vessel is electrically connected with the other end of described voltage table.Be connected with K switch in direct supply, reometer and the formed loop of measured human body, direct supply adopts adjustable constant voltage dc source, and its voltage-regulation scope is 0～55V, and output current scope is 0～30mA.
Human body resistance device under the corresponding above-mentioned DC current, the present invention also provides the method for the human body resistance under a kind of DC current, may further comprise the steps: measured human body both feet place two insulating vessel inner bottom parts to be immersed on the battery lead plate of conducting solution respectively, the loop that conducting is formed by resistance, reometer, direct supply between measured human body both feet, a resistance two ends voltage table in parallel between the measured human body both feet in this loop; Conducting solution employing mass percent is 10% brine solution, and solution deep is 3～5 millimeters; Battery lead plate adopts the copper electrode plate; The container that insulating vessel adopts plastic material to make.The electric current that reometer, voltage table collect, voltage signal are sent into master controller respectively after the A/D conversion process, master controller is according to Ohm law, the electric current after the A/D conversion process, the voltage signal that receives calculated, draw resistance between measured personnel's both feet, as measured personnel's human body resistance value, by this human body resistance value of liquid crystal display displays.
The wiring of carrying out when utilizing the human body resistance measurement device human body resistance under the DC current of the present invention is referring to shown in Figure 1, for the contact resistance R1 that reduces people's pin and electrode surface influence as far as possible to measurement result human body resistance R2, take all factors into consideration the cost performance of insulating material and the accuracy of experimental result, can use two plastic tub as test flume during test, the copper electrode plate of 20 * 20cm is placed wherein, it is in 10% the brine solution (its resistivity is 1.53 Ω m) that surface of contact between people's pin and the battery lead plate is immersed mass percent, the degree of depth of brine solution is about 3～5mm, be not as the criterion can just have the copper electrode plate to make sole all touch liquid level, used brine solution 1500ml in each plastic tub approximately.During test, experimenter's bipod stands in respectively in two plastic tub of having contained salt solution, injects DC current from the copper coin electrode of experimenter's a pin sole, by human body and experimenter's another pin, constitutes the loop with copper coin electrode in another basin.
The structured flowchart of the human body resistance measurement device under the DC current of the present invention is referring to shown in Figure 2, and its core comprises master controller, voltage sampling circuit, current sampling circuit and D.C. regulated power supply, and its voltage can be regulated between 0～55V.In the practical operation, can also insert keyboard, keyboard is connected on the master controller.During work, produce a measuring DC current by D.C. regulated power supply and flow through human body, respectively the signal that collects is sent into A/D converter conversion by voltage sampling circuit, current sampling circuit, primary controller calculates human body resistance according to Ohm law, sends liquid crystal display displays then to.Maximum output voltage of the present invention is 55V, and maximum output current is 30mA, but more than the continuous working 3Ah.
Principle of work of the present invention is as follows: the human body resistance measurement device under the DC current of the present invention adopts an adjustable stabilized voltage supply to offer an average anode current, when electric current flows through human body, produces two signals: voltage signal and current signal.By voltage sampling circuit and current sampling circuit the signal that collects is sent into A/D converter and carry out analog/digital conversion, according to Ohm law, master controller is with the current signal of the voltage signal that produces on the human body divided by whole loop, obtain the resistance of human body, and send liquid crystal display to show calculated result.Equivalent circuit diagram of the present invention is referring to shown in Figure 3.
Operation steps is as follows when using the human body resistance measurement device human body resistance under the DC current of the present invention: 1, correctly connect metering circuit according to Fig. 1; 2, start after the self check, is measured by " measurement " key; 3, read measured value.
Usable range of the present invention and points for attention:
(1) the present invention is applicable to the measurement human body resistance, guarantees during measurement that both feet are that copper electrode plate in 10% the brine solution contacts well with being immersed in mass percent, to reduce the contact resistance between people's pin and the copper electrode plate;
When (2) the present invention measured human body resistance, it was correct to guarantee that measuring circuit connects, and prevents to cause personal injury.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.The content that is not described in detail in this instructions belongs to this area professional and technical personnel's known prior art.
Claims (10)
1, human body resistance device under a kind of DC current, comprise direct supply, reometer, voltage table and the A/D change-over circuit that connects in turn, master controller, LCD, described voltage table, reometer all links to each other with master controller by the A/D change-over circuit, it is characterized in that: it also comprises the contact conducting mechanism that contacts with the human body both feet when measuring, described contact conducting mechanism is made of the insulating vessel of two built-in conducting solutions and battery lead plate, described battery lead plate is dipped in the conducting solution, and be in the inner bottom part of insulating vessel, the interior battery lead plate of insulating vessel is electrically connected with an end of described direct supply, battery lead plate in another insulating vessel is electrically connected with the other end of described direct supply by described reometer, the interior battery lead plate of insulating vessel is electrically connected with an end of described voltage table, and the battery lead plate in another insulating vessel is electrically connected with the other end of described voltage table.
2, the human body resistance device under the DC current as claimed in claim 1 is characterized in that: described conducting solution employing mass percent is 10% brine solution, and solution deep is 3～5 millimeters.
3, the human body resistance device under the DC current as claimed in claim 1 is characterized in that: described battery lead plate adopts the copper electrode plate.
4, the human body resistance device under the DC current as claimed in claim 1 is characterized in that: described insulating vessel adopts plastic material to make.
5, the human body resistance device under the DC current as claimed in claim 1 is characterized in that: be connected with switch in described direct supply, reometer and the formed loop of measured human body.
6, the human body resistance device under the DC current as claimed in claim 1, it is characterized in that: described direct supply adopts adjustable constant voltage dc source, and its voltage-regulation scope is 0～55V, and output current scope is 0～30mA.
7, the human body resistance method under a kind of DC current, it is characterized in that may further comprise the steps: measured human body both feet place two insulating vessel inner bottom parts to be immersed on the battery lead plate of conducting solution respectively, the loop that conducting is formed by resistance, reometer, direct supply between measured human body both feet, a resistance two ends voltage table in parallel between the measured human body both feet in this loop; The electric current that reometer, voltage table collect, voltage signal are sent into master controller respectively after the A/D conversion process, master controller is according to Ohm law, the electric current after the A/D conversion process, the voltage signal that receives calculated, draw resistance between measured personnel's both feet, as measured personnel's human body resistance value, by this human body resistance value of liquid crystal display displays.
8, the human body resistance method under the DC current as claimed in claim 7 is characterized in that: described conducting solution employing mass percent is 10% brine solution, and solution deep is 3～5 millimeters.
9, the human body resistance method under the DC current as claimed in claim 7 is characterized in that: described battery lead plate adopts the copper electrode plate.
10, the human body resistance method under the DC current as claimed in claim 7 is characterized in that: described insulating vessel adopts plastic material to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910063993 CN101650388B (en) | 2009-09-15 | 2009-09-15 | Measuring device and method of human body resistance under DC current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910063993 CN101650388B (en) | 2009-09-15 | 2009-09-15 | Measuring device and method of human body resistance under DC current |
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| CN101650388A true CN101650388A (en) | 2010-02-17 |
| CN101650388B CN101650388B (en) | 2012-10-03 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102068257A (en) * | 2010-12-30 | 2011-05-25 | 河南华南医电科技有限公司 | Voltage-controlled constant current source circuit for three-dimensional mapping of endocardium |
| CN103344834A (en) * | 2013-06-27 | 2013-10-09 | 成都网动光电子技术股份有限公司 | Device for testing body resistance |
| CN105588983A (en) * | 2014-11-14 | 2016-05-18 | 佛山市顺德区美的电热电器制造有限公司 | Test device for conductivity and electric equipment |
| CN108254647A (en) * | 2017-11-30 | 2018-07-06 | 无锡友方电工股份有限公司 | A kind of 200KHZ high frequency transformers conducting wire break-make drive test method for testing |
-
2009
- 2009-09-15 CN CN 200910063993 patent/CN101650388B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102068257A (en) * | 2010-12-30 | 2011-05-25 | 河南华南医电科技有限公司 | Voltage-controlled constant current source circuit for three-dimensional mapping of endocardium |
| CN102068257B (en) * | 2010-12-30 | 2014-07-09 | 河南华南医电科技有限公司 | Voltage-controlled constant current source circuit for three-dimensional mapping of endocardium |
| CN103344834A (en) * | 2013-06-27 | 2013-10-09 | 成都网动光电子技术股份有限公司 | Device for testing body resistance |
| CN105588983A (en) * | 2014-11-14 | 2016-05-18 | 佛山市顺德区美的电热电器制造有限公司 | Test device for conductivity and electric equipment |
| CN108254647A (en) * | 2017-11-30 | 2018-07-06 | 无锡友方电工股份有限公司 | A kind of 200KHZ high frequency transformers conducting wire break-make drive test method for testing |
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| Publication number | Publication date |
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| CN101650388B (en) | 2012-10-03 |
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Owner name: STATE GRID CORPORATION OF CHINA Effective date: 20121119 |
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Effective date of registration: 20121119 Address after: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143 Patentee after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Patentee after: State Grid Corporation of China Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143 Patentee before: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute |