CN102680789B - Method for measuring static resistance of material - Google Patents
Method for measuring static resistance of material Download PDFInfo
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- CN102680789B CN102680789B CN201210146478.6A CN201210146478A CN102680789B CN 102680789 B CN102680789 B CN 102680789B CN 201210146478 A CN201210146478 A CN 201210146478A CN 102680789 B CN102680789 B CN 102680789B
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Abstract
The invention discloses an instrument for measuring static resistance and dynamic change resistance of a material. A power supply voltage signal display circuit is respectively connected with a first standard resistor and an adjustable resistor, wherein the first standard resistor is connected with the adjustable resistor; the adjustable resistor is connected with a second standard resistor; a resistor to be measured is arranged between the first standard resistor and the second standard resistor; a balance electric bridge display circuit is arranged between a connecting point of the first standard resistor and the adjustable resistor and a connecting point of the resistor to be measured and the second standard resistor; and a dynamic voltage display circuit is arranged between the connecting point of the first standard resistor and the adjustable resistor and the connecting point of the resistor to be measured and the second standard resistor. The instrument has the advantages that the measurement of the dynamic change resistance of the material is realized when an external environment (load, temperature and the like) violently changes; and meanwhile, when the external environment (the load, the temperature and the like) violently changes, the static resistance of the material is realized.
Description
The application is to be that October 25, application number in 2010 are 201010517682.5, denomination of invention is to the applying date: a kind of instrument of material static resistance and dynamic change resistance and divisional application of measuring method measured.
Technical field
The present invention relates to a kind of instrument of measuring material resistance, especially relate to a kind of instrument and measuring method of measuring material static resistance and dynamic change resistance.
Background technology
At present according to specific insulation
difference, the way of measuring resistance is divided into two kinds: one be work as
time, use general digital multimeter; Another kind is the develop rapidly along with space flight and aviation cause, light material and the research with the new material of function of shielding are deepened continuously, Scientific Research Workers is put into sight with it the superpolymer such as polypropylene, polyaniline, they are macromolecular materials, add after conductive particle, their electric property during to research material load action electric conductivity inherent mechanism have very important significance, above-mentioned macromolecular material specific insulation
, this need to use high resistant instrument and test.
Within a short period of time, when imposed load, temperature etc. sharply changes, the resistance of measured material there will be one to be exceedingly fast and great variable quantity, and this is the dynamic change resistance of material.Existing resistance-meter is mainly used in the measurement of material static resistance, cannot carry out the dynamic change resistance of material measures, because also do not wait surveying instrument image data, Dynamic Loading changes the resistance variations (requiring survey frequency is 1 time/second) causing and is through with.
Moreover some material is in the time that the external environment such as load and temperature sharply changes, its material resistance magnitude alters a great deal, if resistance is 10
2-10
10in, require survey frequency at 1 beat/min, now also can use static measurement.Static measurement can be used common digital multimeter and two kinds of resistance-meters of high resistant instrument, but changing two kinds of surveying instruments measures, cumbersome on the one hand, because changing two kinds of required certain time intervals of instrument, may cause measuring error because of delaying of time on the other hand.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of instrumentation and testing method of measuring material static resistance and dynamic change resistance, both the MATERIALS ' DYNAMIC can measure external environment and sharply change time changes resistance, the material static resistance also can measure external environment and sharply change time.In the time that external environment sharply changes, some material resistance magnitude alters a great deal, and the present invention can the higher resistance of measuring amount level, also can measure the resistance that magnitude is lower simultaneously, realizes the material that magnitude is altered a great deal and measures.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of instrument of measuring material static resistance and dynamic change resistance, comprise variable voltage source and power supply voltage signal display circuit, described variable voltage source is connected with described power supply voltage signal display circuit, it is characterized in that it also comprises the first calibration resistor, adjustable resistor, the second calibration resistor, balanced bridge display circuit and dynamic electric voltage display circuit, described power supply voltage signal display circuit is connected with described the first calibration resistor and adjustable resistor respectively, the first described calibration resistor is connected with described adjustable resistor, described adjustable resistor is connected with the second described calibration resistor, testing resistance is arranged between the first calibration resistor and the second calibration resistor, described balanced bridge display circuit is arranged between the tie point between tie point and testing resistance and the second calibration resistor between the first calibration resistor and adjustable resistor, described dynamic electric voltage display circuit is arranged between the tie point between tie point and testing resistance and the second calibration resistor between the first calibration resistor and adjustable resistor.
Described balanced bridge display circuit comprises the first hyperchannel toggle switch, selectable resistors, the second hyperchannel toggle switch and microampere meter, described selectable resistors is connected between the first hyperchannel toggle switch and the second hyperchannel toggle switch, the first described hyperchannel toggle switch is connected with the tie point between the first calibration resistor and adjustable resistor, the second described hyperchannel toggle switch is connected with the tie point between testing resistance and the second calibration resistor, described dynamic electric voltage display circuit comprises digital storage oscilloscope, one end after described microampere meter is in parallel with digital storage oscilloscope is connected to the tie point between the first calibration resistor and adjustable resistor, the other end after described microampere meter is in parallel with digital storage oscilloscope is connected to the tie point between the second calibration resistor and testing resistance.
Between tie point between the first calibration resistor and the first hyperchannel toggle switch and adjustable resistor, be provided with the 3rd selector switch and the 8th selector switch, tie point between the 3rd selector switch and the 8th selector switch, between microampere meter and digital storage oscilloscope, be provided with the 5th selector switch, between tie point between the second hyperchannel toggle switch and the second calibration resistor and testing resistance, be provided with the second selector switch, tie point between the second hyperchannel toggle switch and the second calibration resistor, between microampere meter and digital storage oscilloscope, be provided with the 7th selector switch, described adjustable resistor comprises accurate adjustment resistance and roughly adjusted rheostat, accurate adjustment resistance is connected with multimeter by the 9th selector switch with roughly adjusted rheostat.
Described variable voltage source one end is provided with the first switch, and described power supply voltage signal display circuit comprises the first light emitting diode and the 7th resistance.
The first described calibration resistor comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance and the 6th resistance, adjustable resistor also comprises the 9th resistance, the tenth resistance, the 11 resistance and the 12 resistance, selectable resistors comprises the 13 resistance, the 14 resistance, the 15 resistance, the 16 resistance, the 17 resistance and the 18 resistance, the second calibration resistor comprises the 19 resistance, the 20 resistance, the 21 resistance, the 22 resistance, the 23 resistance and the 24 resistance, the first described hyperchannel toggle switch and the second hyperchannel toggle switch are all six passage toggle switchs, the second selector switch, the 3rd selector switch, the 7th selector switch and the 8th selector switch Dou Wei six tunnel selector switch.
A measuring method for material static resistance, its concrete steps are as follows:
Step 1: first connect electrode in the both sides of detected materials;
Step 2: the detected materials that connects electrode is linked between the second selector switch and the first calibration resistor;
Step 3: regulate the 3rd selector switch, the 6th resistance in the first calibration resistor is connected, regulate the first hyperchannel toggle switch and the second hyperchannel toggle switch, the 13 resistance in selectable resistors is connected, regulate the second selector switch, the 24 resistance in the second calibration resistor is connected, regulate the 8th selector switch, roughly adjusted rheostat in adjustable resistor is connected, regulate the 5th selector switch and the 7th selector switch, microampere meter is connected, and first switch that closes, makes variable voltage source output 10V voltage;
Step 4: regulate roughly adjusted rheostat, make microampere meter pointer nulling;
Step 5: regulate the 8th selector switch, the accurate adjustment resistance in adjustable resistor is connected, regulate accurate adjustment resistance, make microampere meter pointer nulling, reach bridge balance;
Step 6: regulate the 9th selector switch, measure the resistance value of accurate adjustment resistance with multimeter, according to the resistance of resistance/eight resistance of resistance * the 24 resistance of detected materials resistance RX=the 6th resistance.
A measuring method for MATERIALS ' DYNAMIC resistance, its concrete steps are as follows:
Step 1: in Hopkinson pressure bar device, add detected materials sample;
Step 2: the both sides of detected materials are connected to electrode;
Step 3: the detected materials that connects electrode is linked between the second selector switch and the first calibration resistor;
Step 4: regulate the 3rd selector switch, the 5th resistance in the first calibration resistor is connected, regulate the first hyperchannel toggle switch and the second hyperchannel toggle switch, the 14 resistance in selectable resistors is connected, regulate the second selector switch, the 23 resistance in the second calibration resistor is connected, regulate the 8th selector switch, roughly adjusted rheostat in adjustable resistor is connected, regulate the 5th selector switch and the 7th selector switch, microampere meter is connected, and first switch that closes, makes variable voltage source output 100V voltage;
Step 5: regulate roughly adjusted rheostat, make microampere meter pointer nulling;
Step 6: regulate the 8th selector switch, the accurate adjustment resistance in adjustable resistor is connected, regulate accurate adjustment resistance, make microampere meter pointer nulling, reach bridge balance;
Step 7: regulate the 9th selector switch, measure the resistance value of accurate adjustment resistance with multimeter, according to the resistance of resistance/eight resistance of resistance * the 23 resistance of detected materials resistance RX=the 5th resistance;
Step 8: select the 5th selector switch, connect digital storage oscilloscope, select the 8th selector switch to connect the 9th resistance or the tenth resistance or the 11 resistance or the 12 resistance that approach with accurate adjustment resistance magnitude;
Step 9: start Hopkinson pressure bar device, drop bar clashes into incident bar, incident bar effect detected materials sample, detected materials sample effect transmission bar, transmission bar effect absorbing rod, absorbing rod clashes into damper;
Step 10: record the change in voltage curve showing on digital storage oscilloscope;
Step 11: by the conversion formula between voltage and resistance, change in voltage Curve transform is become to material change in resistance curve.
Compared with prior art, advantage of the present invention is in the time of external environment condition (load and temperature etc.) acute variation, realize the measurement that MATERIALS ' DYNAMIC is changed to resistance, in the time of external environment condition (load and temperature etc.) acute variation, realize the measurement to material static resistance simultaneously.In the time that external environment sharply changes, some material resistance magnitude alters a great deal, and the present invention can the higher resistance of measuring amount level, also can measure the resistance that magnitude is lower simultaneously, realizes the material that magnitude is altered a great deal and measures.
Accompanying drawing explanation
Fig. 1 is circuit structure block diagram of the present invention;
Fig. 2 is circuit theory diagrams of the present invention;
Fig. 3 is the dynamic resistance measurement mechanism of the present invention structural drawing.
Embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the present invention.
A kind of instrument of measuring material static resistance and dynamic change resistance, comprise variable voltage source BT1 and power supply voltage signal display circuit 2, variable voltage source BT1 is connected with power supply voltage signal display circuit 2, it also comprises the first calibration resistor 3, adjustable resistor 4, the second calibration resistor 5, balanced bridge display circuit 6 and dynamic electric voltage display circuit 7, power supply voltage signal display circuit 2 is connected with the first calibration resistor 3 and adjustable resistor 4 respectively, the first calibration resistor 3 is connected with adjustable resistor 4, adjustable resistor 4 is connected with the second calibration resistor 5, testing resistance RX is arranged between the first calibration resistor 3 and the second calibration resistor 5, balanced bridge display circuit 6 is arranged between the tie point between tie point and testing resistance RX and the second calibration resistor 5 between the first calibration resistor 3 and adjustable resistor 4, dynamic electric voltage display circuit 7 is arranged between the tie point between tie point and testing resistance RX and the second calibration resistor 5 between the first calibration resistor 3 and adjustable resistor 4.
Balanced bridge display circuit 6 comprises the first hyperchannel toggle switch S4, selectable resistors RZ, the second hyperchannel toggle switch S6 and microampere meter, selectable resistors RZ is connected between the first hyperchannel toggle switch S4 and the second hyperchannel toggle switch S6, the first hyperchannel toggle switch S4 is connected with the tie point between the first calibration resistor 3 and adjustable resistor 4, the second hyperchannel toggle switch S6 is connected with the tie point between testing resistance RX and the second calibration resistor 5, dynamic electric voltage display circuit 7 comprises digital storage oscilloscope, one end after microampere meter is in parallel with digital storage oscilloscope is connected to the tie point between the first calibration resistor 3 and adjustable resistor 4, the other end after microampere meter is in parallel with digital storage oscilloscope is connected to the tie point between the second calibration resistor 5 and testing resistance RX.
Between tie point between the first calibration resistor 3 and the first hyperchannel toggle switch S4 and adjustable resistor 4, be provided with the 3rd selector switch S3 and the 8th selector switch S8, tie point between the 3rd selector switch S3 and the 8th selector switch S8, between microampere meter and digital storage oscilloscope, be provided with the 5th selector switch S5, between tie point between the second hyperchannel toggle switch S6 and the second calibration resistor 5 and testing resistance RX, be provided with the second selector switch S2, tie point between the second hyperchannel toggle switch S6 and the second calibration resistor 5, between microampere meter and digital storage oscilloscope, be provided with the 7th selector switch S7, adjustable resistor 4 comprises accurate adjustment resistance R 8 and roughly adjusted rheostat R25, accurate adjustment resistance R 8 is connected with multimeter by the 9th selector switch S9 with roughly adjusted rheostat R25.By the selection to two hyperchannel toggle switchs, the suitable resistance of selection that can be in selectable resistors RZ.
Variable voltage source BT1 one end is provided with the first switch S 1, and power supply voltage signal display circuit 2 comprises the first light emitting diode D1 and the 7th resistance R 7.
The first calibration resistor 3 comprises that resistance is first resistance R 1 of 100 ohm, resistance is second resistance R 2 of 1K ohm, resistance is the 3rd resistance R 3 of 10K ohm, resistance is the 4th resistance R 4 of 100K ohm, resistance is that the 5th resistance R 5 and the resistance of 1M ohm is the 6th resistance R 6 of 10M ohm, and adjustable resistor 4 also comprises that resistance is the 9th resistance R 9 of 1 ohm, resistance is the tenth resistance R 10 of 10 ohm, resistance is that the 11 resistance R 11 and the resistance of 100 ohm is the 12 resistance R 12 of 1K ohm, and selectable resistors RZ comprises that resistance is the 13 resistance R 13 of 100K ohm, resistance is the 14 resistance R 14 of 100K ohm, resistance is the 15 resistance R 15 of 10K ohm, resistance is the 16 resistance R 16 of 1K ohm, resistance is that the 17 resistance R 17 of 100 ohm and resistance are that the 18 resistance R 18, the second calibration resistors 5 of 10 ohm comprise that resistance is the 19 resistance R 19 of 100 ohm, resistance is the 20 resistance R 20 of 1K ohm, resistance is the 21 resistance R 21 of 10K ohm, resistance is the 22 resistance R 22 of 100K ohm, resistance is that the 23 resistance R 23 of 1M ohm and resistance are that the 24 resistance R 24, the first hyperchannel toggle switch S4 and the second hyperchannel toggle switch S6 of 10M ohm is six passage toggle switchs, the second selector switch S2, the 3rd selector switch S3, the 7th selector switch S7 and the 8th selector switch S8 Dou Wei six tunnel selector switch.
A measuring method for material static resistance, its concrete steps are as follows:
Step 1: first connect electrode in the both sides of detected materials RX;
Step 2: the detected materials RX that connects electrode is linked between the second selector switch S2 and the first calibration resistor 3;
Step 3: regulate the 3rd selector switch S3, the 6th resistance R 6 in the first calibration resistor 3 is connected, regulate the first hyperchannel toggle switch S4 and the second hyperchannel dial-up S6 switch, the 13 resistance R 13 in selectable resistors RZ is connected, regulate the second selector switch S2, the 24 resistance R 24 in the second calibration resistor 5 is connected, regulate the 8th selector switch S8, roughly adjusted rheostat R25 in adjustable resistor 4 is connected, regulate the 5th selector switch S5 and the 7th selector switch S7, microampere meter is connected, first switch S 1 of closing, make variable voltage source BT1 output 10V voltage,
Step 4: regulate roughly adjusted rheostat R25, make microampere meter pointer nulling;
Step 5: regulate the 8th selector switch S8, the accurate adjustment resistance R 8 in adjustable resistor 4 is connected, regulate accurate adjustment resistance R 8, make microampere meter pointer nulling, reach bridge balance;
Step 6: regulate the 9th selector switch S9, measure the resistance value of accurate adjustment resistance R 8 with multimeter, according to the resistance of resistance/eight resistance R 8 of resistance * the 24 resistance R 24 of the resistance of detected materials RX=six resistance R 6.
A measuring method for MATERIALS ' DYNAMIC resistance, its concrete steps are as follows:
Step 1: the both sides of detected materials RX are connected to electrode;
Step 2: the detected materials RX that connects electrode is linked between the second selector switch S2 and the first calibration resistor 3;
Step 3: detected materials RX sample is added in Hopkinson pressure bar device;
Step 4: regulate the 3rd selector switch S3, the 5th resistance R 5 in the first calibration resistor 3 is connected, regulate the first hyperchannel toggle switch S4 and the second hyperchannel dial-up S6 switch, the 14 resistance R 14 in selectable resistors RZ is connected, regulate the second selector switch S2, the 23 resistance R 23 in the second calibration resistor 5 is connected, regulate the 8th selector switch S8, roughly adjusted rheostat R25 in adjustable resistor 4 is connected, regulate the 5th selector switch S5 and the 7th selector switch S7, microampere meter is connected, first switch S 1 of closing, make variable voltage source BT1 output 100V voltage,
Step 5: regulate roughly adjusted rheostat R25, make microampere meter pointer nulling;
Step 6: regulate the 8th selector switch S8, the accurate adjustment resistance R 8 in adjustable resistor 4 is connected, regulate accurate adjustment resistance R 8, make microampere meter pointer nulling, reach bridge balance;
Step 7: regulate the 9th selector switch S9, measure the resistance value of accurate adjustment resistance R 8 with multimeter, according to the resistance of resistance/eight resistance R 8 of resistance * the 23 resistance R 23 of detected materials RX resistance=five resistance R 5;
Step 8: select the 5th selector switch S5, connect digital storage oscilloscope, select the 8th selector switch S8 to connect the 9th resistance R 9 or the tenth resistance R the 10 or the 11 resistance R the 11 or the 12 resistance R 12 that approach with accurate adjustment resistance R 8 resistance magnitudes; Avoid large electric current to damage accurate adjustment resistance R 8;
Step 9: start Hopkinson pressure bar device, drop bar 8 clashes into incident bar 9, and incident bar 9 acts on detected materials RX sample, detected materials RX sample effect transmission bar 10, transmission bar 10 acts on absorbing rod 11, and absorbing rod 11 clashes into damper 12;
Step 10: record the change in voltage curve showing on digital storage oscilloscope;
Step 11: by the conversion formula between voltage and resistance, change in voltage Curve transform is become to material change in resistance curve.
Claims (2)
1. the measuring method of a material static resistance, use a kind of instrument of measuring material static resistance and dynamic change resistance, comprise variable voltage source and power supply voltage signal display circuit, described variable voltage source is connected with described power supply voltage signal display circuit, also comprise the first calibration resistor, adjustable resistor, the second calibration resistor, balanced bridge display circuit and dynamic electric voltage display circuit, described power supply voltage signal display circuit is connected with described the first calibration resistor and adjustable resistor respectively, the first described calibration resistor is connected with described adjustable resistor, described adjustable resistor is connected with the second described calibration resistor, testing resistance is arranged between the first calibration resistor and the second calibration resistor, described balanced bridge display circuit is arranged between the tie point between tie point and testing resistance and the second calibration resistor between the first calibration resistor and adjustable resistor, described dynamic electric voltage display circuit is arranged between the tie point between tie point and testing resistance and the second calibration resistor between the first calibration resistor and adjustable resistor,
Described balanced bridge display circuit comprises the first hyperchannel toggle switch, selectable resistors, the second hyperchannel toggle switch and microampere meter, described selectable resistors is connected between the first hyperchannel toggle switch and the second hyperchannel toggle switch, the first described hyperchannel toggle switch is connected with the tie point between the first calibration resistor and adjustable resistor, the second described hyperchannel toggle switch is connected with the tie point between testing resistance and the second calibration resistor, described dynamic electric voltage display circuit comprises digital storage oscilloscope, one end after described microampere meter is in parallel with digital storage oscilloscope is connected to the tie point between the first calibration resistor and adjustable resistor, the other end after described microampere meter is in parallel with digital storage oscilloscope is connected to the tie point between the second calibration resistor and testing resistance,
Between tie point between the first calibration resistor and the first hyperchannel toggle switch and adjustable resistor, be provided with the 3rd selector switch and the 8th selector switch, tie point between the 3rd selector switch and the 8th selector switch, between microampere meter and digital storage oscilloscope, be provided with the 5th selector switch, between tie point between the second hyperchannel toggle switch and the second calibration resistor and testing resistance, be provided with the second selector switch, tie point between the second hyperchannel toggle switch and the second calibration resistor, between microampere meter and digital storage oscilloscope, be provided with the 7th selector switch, described adjustable resistor comprises accurate adjustment resistance and roughly adjusted rheostat, accurate adjustment resistance is connected with multimeter by the 9th selector switch with roughly adjusted rheostat,
The first described calibration resistor comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance and the 6th resistance, adjustable resistor also comprises the 9th resistance, the tenth resistance, the 11 resistance and the 12 resistance, selectable resistors comprises the 13 resistance, the 14 resistance, the 15 resistance, the 16 resistance, the 17 resistance and the 18 resistance, the second calibration resistor comprises the 19 resistance, the 20 resistance, the 21 resistance, the 22 resistance, the 23 resistance and the 24 resistance, the first described hyperchannel toggle switch and the second hyperchannel toggle switch are all six passage toggle switchs, the second selector switch, the 3rd selector switch, the 7th selector switch and the 8th selector switch Dou Wei six tunnel selector switch,
It is characterized in that concrete steps are as follows:
Step 1: first connect electrode in the both sides of detected materials;
Step 2: the detected materials that connects electrode is linked between the second selector switch and the first calibration resistor;
Step 3: regulate the 3rd selector switch, the 6th resistance in the first calibration resistor is connected, regulate the first hyperchannel toggle switch and the second hyperchannel toggle switch, the 13 resistance in selectable resistors is connected, regulate the second selector switch, the 24 resistance in the second calibration resistor is connected, regulate the 8th selector switch, roughly adjusted rheostat in adjustable resistor is connected, regulate the 5th selector switch and the 7th selector switch, microampere meter is connected, and first switch that closes, makes variable voltage source output 10V voltage;
Step 4: regulate roughly adjusted rheostat, make microampere meter pointer nulling;
Step 5: regulate the 8th selector switch, the accurate adjustment resistance in adjustable resistor is connected, regulate accurate adjustment resistance, make microampere meter pointer nulling, reach bridge balance;
Step 6: regulate the 9th selector switch, measure the resistance value of accurate adjustment resistance with multimeter, according to resistance/accurate adjustment resistance of resistance * the 24 resistance of detected materials resistance RX=the 6th resistance.
2. the measuring method of a kind of material static resistance according to claim 1, is characterized in that described variable voltage source one end is provided with the first switch, and described power supply voltage signal display circuit comprises the first light emitting diode and the 7th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210146478.6A CN102680789B (en) | 2010-10-25 | 2010-10-25 | Method for measuring static resistance of material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210146478.6A CN102680789B (en) | 2010-10-25 | 2010-10-25 | Method for measuring static resistance of material |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105176825A Division CN101995517B (en) | 2010-10-25 | 2010-10-25 | Instrument and method for measuring static resistance and dynamic change resistance of material |
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| CN102680789A CN102680789A (en) | 2012-09-19 |
| CN102680789B true CN102680789B (en) | 2014-06-25 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105067886B (en) * | 2015-07-15 | 2017-11-03 | 北京东方计量测试研究所 | A kind of method and apparatus for measuring resistance load coefficient |
| CN105424758A (en) * | 2015-12-16 | 2016-03-23 | 格力电器（芜湖）有限公司 | Resistance calibration device |
| CN110134164B (en) * | 2019-04-29 | 2020-10-30 | 淮南万泰电气有限公司 | Temperature control system for constant-temperature workshop |
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|---|---|---|---|---|
| GB691633A (en) * | 1951-02-20 | 1953-05-20 | George Frederick Shotter | Improvements in or relating to the measurement of resistance |
| DE2357693A1 (en) * | 1973-11-19 | 1975-05-22 | Rose Walter Kg | CIRCUIT ARRANGEMENT FOR COMPARATIVE MEASUREMENT OF RESISTORS, IN PARTICULAR INSULATION RESISTORS |
| US4278932A (en) * | 1978-07-11 | 1981-07-14 | Tait David A G | A.C. Bridges |
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