CN201562016U - Explosion-preventing resistance measuring instrument - Google Patents
Explosion-preventing resistance measuring instrument Download PDFInfo
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- CN201562016U CN201562016U CN2009201002193U CN200920100219U CN201562016U CN 201562016 U CN201562016 U CN 201562016U CN 2009201002193 U CN2009201002193 U CN 2009201002193U CN 200920100219 U CN200920100219 U CN 200920100219U CN 201562016 U CN201562016 U CN 201562016U
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Abstract
An explosion-preventing resistance measuring instrument. The small resistance is measured by adopting a heavy exciting current so as to increase the signal amplitude picked by the measuring unit, improve the signal to noise ratio and enhance the measuring precision. However, the heavy exciting current is unable to be used in some special application occasion, for instance in measuring the resistance of the detonator; the resistance of the detonator is small and the heavy exciting current will generate explosion so that it is strictly limited. The utility model includes an exciting and sampling unit which is connected with a measuring mainboard; and the measuring mainboard is connected with an auxiliary power supply module, a keyboard and a liquid crystal display unit. The utility model is applied to measuring the resistance and is especially suitable for occasions of small resistance such as a detonator and a high safety requirement.
Description
Technical field:
The utility model relates to a kind of resistance measuring instrument, is specifically related to a kind of explosion-proof resistance measuring instrument.
Background technology:
The measurement ubiquity of resistance has important effect in modern industry production, scientific research and development, teaching and life.
The ultimate principle of direct current resistance beasurement base is an Ohm law; common method is four line mensurations; promptly adopt the constant current excitation measured resistance; the magnitude of voltage at while measuring resistance two ends; calculate the resistance of measured resistance; generally adopt big exciting current now for small resistance measurement; to increase the voltage drop at resistance two ends; thereby improve signal to noise ratio (S/N ratio) and improve measuring accuracy, still, then can not be suitable for for some special application scenarios; resistance measurement as detonator; its resistance ratio is less, and exciting current is had strict restriction, and big exciting current will set off an explosion; therefore; must adopt little exciting current, under the small-signal situation, carry out precision measurement, and reliable safety precautions must be arranged.
Summary of the invention:
The purpose of this utility model is at such as detonator etc. the test and excitation electric current being had strict restriction, less, the strict explosion-proof object of resistance, a kind of explosion-proof resistance measuring instrument being provided.
Above-mentioned purpose realizes by following technical scheme:
Explosion-proof resistance measuring instrument, its composition comprises: excitation and sampling unit, described excitation are connected with sampling unit measures mainboard, and described measurement mainboard connects accessory power supply module and keyboard and digital display unit.
Described explosion-proof resistance measuring instrument; described measurement mainboard comprises protected location, constant current source unit, the four-wire ohm measuring unit that is connected with sampling unit with described excitation; described constant current source unit connects the power supply reference cell; described four-wire ohm measuring unit connects micro controller unit, and described micro controller unit connects temperature measurement unit and described keyboard and digital display unit.
The beneficial effects of the utility model:
1. the utility model can be realized the high precision measurement of the small resistor under safety anti-explosive and the little current excitation situation, the constant current source that is used to measure adopts mirror current source to add the design of analog closed-loop control principle, realize the constant current output and the adaptive load conciliation of high stability, can eliminate the influence of load variations; The resistance measurement unit adopts the four-terminal measurement method, has guaranteed accuracy of measurement; Instrument adopts the duplicate protection measure, protected location comprises overcurrent protection and spike pulse protection, can guarantee that the maximum current that flows through detected element leaves very big margin of safety, and can effectively suppress peak current and flow through detected element, can guarantee the security used, and take into full account in design because the various failure conditions that the individual metablocks device lost efficacy in advance and can cause have further been guaranteed reliability of products and security; Instrument has the auto thermal compensation function, and temperature measurement unit is measured the environment temperature that instrument uses, and according to temperature measurement result, measurement is compensated, and guarantees the precision of instrument in wide temperature range; Instrument has automatic calibration function, when changing measurement test pencil or temperature variation, can compensate measurement automatically, guarantees in the accuracy of changing instrument under the annex situation.
2. generally adopt big exciting current now for small resistance measurement,, improve measuring accuracy thereby improve signal to noise ratio (S/N ratio) to increase the voltage drop at resistance two ends; but; then can not be suitable for for some special application scenarios, as the resistance measurement of detonator, its resistance ratio is less; and exciting current there is strict restriction; big exciting current will set off an explosion, and therefore, must adopt little exciting current; under the small-signal situation, carry out precision measurement, and reliable safety precautions must be arranged.The utility model adopts the four-wire method measuring resistance of little exciting current, promptly adopt the constant current excitation measured resistance, the magnitude of voltage at while measuring resistance two ends, calculate the resistance of measured resistance, and by chip microcontroller data processing, calibration and temperature compensation, this measuring method can eliminate the resistance of slotted line fully, can accurately reflect the resistance of small resistor.
Description of drawings:
Accompanying drawing 1 is a panel synoptic diagram of the present utility model.
Accompanying drawing 2 is theory diagrams of the present utility model.
Accompanying drawing 4 is circuit diagrams of the utility model micro controller unit.
Accompanying drawing 5 is circuit diagrams of the utility model keyboard and digital display unit.
Accompanying drawing 6 is circuit diagrams of the utility model resistance four line measuring units.
Accompanying drawing 7 is circuit diagrams of the utility model constant current source unit.
Accompanying drawing 8 is circuit diagrams of the utility model temperature measurement unit.
Accompanying drawing 9 is circuit diagrams of the utility model accessory power supply unit.
Accompanying drawing 10 is circuit diagrams of the utility model voltage reference unit.
Accompanying drawing 11 is circuit diagrams of the utility model excitation and sampling unit.
Accompanying drawing 12 is way circuit figure of the present utility model.
Embodiment:
Embodiment 1:
Explosion-proof resistance measuring instrument, its composition comprises: excitation and sampling unit, accessory power supply module, measurement mainboard, keyboard and digital display unit, described measurement mainboard links to each other with sampling unit with excitation, measurand is applied pumping signal and measurand is taken a sample by excitation and sampling unit, described excitation and sampling unit are connected with constant current source and resistance four line measuring units in the measurement mainboard, described accessory power supply module is connected with the measurement mainboard, and described measurement mainboard is connected with keyboard and liquid crystal display.
Described explosion-proof resistance measuring instrument, described measurement mainboard comprise voltage reference unit, constant current source unit, protected location, resistance four line measuring units, temperature measurement unit, keyboard and digital display unit, micro controller unit.
Described accessory power supply module adopts power transformer, rectifier bridge, wave filter, voltage stabilizer and filter capacitor etc., will exchange 220 volts of power source conversion and be direct current+5 volt with ± 12 volts, for whole instrument provides direct supply.
Described voltage reference adopts accurate prover pipe LM399 and peripheral circuit to realize, provides a stable reference dc voltage, as the input voltage benchmark of subordinate constant current source unit.
Described constant current source unit adopts mirror current source and the design of analog closed-loop control principle, adopts compositions such as operational amplifier OP07 and precision resistance, has realized that the constant current output and the adaptive load of high stability reconciled, and can eliminate the influence of load variations.
Described excitation and sampling unit are realized by highly reliable coupling arrangement and measuring pen, are finished applying of exciting current and picking up of voltage signal.
Described protected location links to each other with sampling unit with excitation; instrument adopts the duplicate protection measure; protected location comprises overcurrent protection and spike pulse protection; can guarantee that the maximum current that flows through detected element is no more than 30mA; leave very big margin of safety; and can effectively suppress peak current and flow through detected element; can guarantee the security used; in addition; take into full account in design because the various failure conditions that the individual metablocks device lost efficacy in advance and can cause; make also not occur over-current phenomenon avoidance under the situation about breaking down, further guaranteed security of products.
Described resistance four line measuring units link to each other with sampling unit with excitation, are made up of differential amplifier circuit, 14 A/D converters (A/D), and measured resistance is detected, and realize the conversion of analog quantity to digital quantity.
The output of described measuring unit links to each other with micro controller unit, and microcontroller adopts the 89c55 single-chip microcomputer, and measurement data is handled.
Described temperature measurement unit links to each other with micro controller unit, is made up of temperature survey chip TMP100 and peripheral components, temperature measurement result is offered micro controller unit carry out data processing.
Described keyboard and digital display unit adopt film key and charactron to form respectively, and they are worked in coordination, and realize setting, calibration, the control of measurement and the demonstration of measurement result etc. of parameter.
Described micro controller unit is mainly finished following three work, the first is handled keyboard operation, realize measuring and automatic calibration for instruments, it two is to accept the data of resistance four line measuring units and temperature measurement unit and finish Measurement and Data Processing, and it three is the operations that realize the logarithmic code display unit.
Embodiment 2:
Above-mentioned explosion-proof resistance measuring instrument, described accessory power supply module adopts the switching power supply module, will exchange 220 volts of power source conversion and be direct current+5 volt with ± 12 volts, for whole instrument provides direct supply.
Embodiment 3:
Above-mentioned explosion-proof resistance measuring instrument, described resistance four line measuring units link to each other with sampling unit with excitation, are realized measured resistance is detected by differential amplifier circuit, four half module/number converter ICL7135, realize the conversion of analog quantity to digital quantity.
Claims (2)
1. explosion-proof resistance measuring instrument, its composition comprises: excitation and sampling unit, accessory power supply module, measurement mainboard, keyboard and digital display unit, it is characterized in that: described excitation is connected with sampling unit measures mainboard, and described measurement mainboard connects accessory power supply module and keyboard and digital display unit.
2. explosion-proof resistance measuring instrument according to claim 1; it is characterized in that: described measurement mainboard comprises protected location, constant current source unit, the four-wire ohm measuring unit that is connected with sampling unit with described excitation; described constant current source unit connects the power supply reference cell; described four-wire ohm measuring unit connects micro controller unit, and described micro controller unit connects temperature measurement unit and described keyboard and digital display unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201002193U CN201562016U (en) | 2009-06-23 | 2009-06-23 | Explosion-preventing resistance measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201002193U CN201562016U (en) | 2009-06-23 | 2009-06-23 | Explosion-preventing resistance measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201562016U true CN201562016U (en) | 2010-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009201002193U Expired - Fee Related CN201562016U (en) | 2009-06-23 | 2009-06-23 | Explosion-preventing resistance measuring instrument |
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| CN (1) | CN201562016U (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344838A (en) * | 2013-06-27 | 2013-10-09 | 中国西电电气股份有限公司 | Device and method for measuring resistance value of microhm shunt under large currents |
| CN103472307A (en) * | 2013-09-10 | 2013-12-25 | 中国工程物理研究院化工材料研究所 | Computer micro-resistor high-precision testing device based on CPCI |
| CN105277789A (en) * | 2015-10-23 | 2016-01-27 | 徐州江煤科技有限公司 | Mine electric detonator resistance tester |
| CN104267262B (en) * | 2014-07-22 | 2017-07-04 | 国家电网公司 | A kind of high-precision loop resistance intelligent tester |
| CN107132408A (en) * | 2017-06-28 | 2017-09-05 | 同济大学 | Commercial electric detonator tube resistor safety instrumentation and method |
| CN108490264A (en) * | 2018-03-27 | 2018-09-04 | 中国人民解放军空军工程大学 | A kind of digital display explosion cap tester and its operating method |
| CN110036301A (en) * | 2016-11-25 | 2019-07-19 | 伊莎贝尔努特·霍伊斯勒两合公司 | Current measuring device |
| CN111207634A (en) * | 2020-03-18 | 2020-05-29 | 融硅思创(北京)科技有限公司 | Digital electronic detonator chip with resistance detection function and resistance detection method |
| CN111208411A (en) * | 2020-01-16 | 2020-05-29 | 冬烨(上海)机电科技有限公司 | Multi-channel low-resistance test system |
| CN111239494A (en) * | 2020-02-03 | 2020-06-05 | 杭州晋旗电子科技有限公司 | Method and system for measuring resistance value of communication bus of electronic detonator on line |
| CN111366054A (en) * | 2020-03-20 | 2020-07-03 | 中国人民解放军陆军装甲兵学院士官学校 | Electric detonator detecting and destroying device of portable automatic fire extinguishing and explosion suppression device |
-
2009
- 2009-06-23 CN CN2009201002193U patent/CN201562016U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344838A (en) * | 2013-06-27 | 2013-10-09 | 中国西电电气股份有限公司 | Device and method for measuring resistance value of microhm shunt under large currents |
| CN103472307A (en) * | 2013-09-10 | 2013-12-25 | 中国工程物理研究院化工材料研究所 | Computer micro-resistor high-precision testing device based on CPCI |
| CN104267262B (en) * | 2014-07-22 | 2017-07-04 | 国家电网公司 | A kind of high-precision loop resistance intelligent tester |
| CN105277789A (en) * | 2015-10-23 | 2016-01-27 | 徐州江煤科技有限公司 | Mine electric detonator resistance tester |
| CN105277789B (en) * | 2015-10-23 | 2018-08-03 | 徐州江煤科技有限公司 | Mining resistance of electric detonator tester |
| CN110036301A (en) * | 2016-11-25 | 2019-07-19 | 伊莎贝尔努特·霍伊斯勒两合公司 | Current measuring device |
| CN107132408A (en) * | 2017-06-28 | 2017-09-05 | 同济大学 | Commercial electric detonator tube resistor safety instrumentation and method |
| CN108490264A (en) * | 2018-03-27 | 2018-09-04 | 中国人民解放军空军工程大学 | A kind of digital display explosion cap tester and its operating method |
| CN111208411A (en) * | 2020-01-16 | 2020-05-29 | 冬烨(上海)机电科技有限公司 | Multi-channel low-resistance test system |
| CN111239494A (en) * | 2020-02-03 | 2020-06-05 | 杭州晋旗电子科技有限公司 | Method and system for measuring resistance value of communication bus of electronic detonator on line |
| CN111239494B (en) * | 2020-02-03 | 2022-08-12 | 杭州晋旗电子科技有限公司 | Method and system for measuring resistance value of communication bus of electronic detonator on line |
| CN111207634A (en) * | 2020-03-18 | 2020-05-29 | 融硅思创(北京)科技有限公司 | Digital electronic detonator chip with resistance detection function and resistance detection method |
| CN111366054A (en) * | 2020-03-20 | 2020-07-03 | 中国人民解放军陆军装甲兵学院士官学校 | Electric detonator detecting and destroying device of portable automatic fire extinguishing and explosion suppression device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100825 Termination date: 20110623 |