CN204214952U - Transition low capacitance measurement instrument - Google Patents
Transition low capacitance measurement instrument Download PDFInfo
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- CN204214952U CN204214952U CN201420470256.4U CN201420470256U CN204214952U CN 204214952 U CN204214952 U CN 204214952U CN 201420470256 U CN201420470256 U CN 201420470256U CN 204214952 U CN204214952 U CN 204214952U
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Abstract
Disclosed in the utility model, transition low capacitance measurement instrument belongs to capacitance measurement technique field, this measuring instrument comprises housing and metering circuit and software systems, metering circuit is by photoelectric source circuit, transition low capacitance measurement circuit, data acquisition memory circuit forms, photoelectric source circuit is the self power generation that an employing light makes power supply, self-powered, the photoelectric source circuit of automatic control survey, transition low capacitance measurement circuit is that a precision compares and measures circuit, data acquisition memory circuit is a precision data store circuit, measuring instrument advantage has: adopt the charging of photoelectricity trigging control, electric discharge, standard capacitance and testing capacitance is only needed to carry out a discharge and recharge, just can complete the measurement of small capacitance, circuit design is advanced, logical relation is simple, fast response time, easy and simple to handle, instrument volume is little, transition low capacitance measurement instrument of the present utility model is worth adopting and promoting.
Description
Technical field
Disclosed in the utility model, transition low capacitance measurement instrument belongs to capacity measurement technical field, and what be specifically related to is a kind of instrument measuring transition small capacitances.
Background technology
In traditional tiny capacitance technical field, the integrated level of most of measuring method is low, complex circuit designs, and volume is large, low precision.As resonance method poor dynamic, frequency of operation is higher, and the impact of circuit stray electric capacity is comparatively obvious.For another example be the capacitive detection system of core with MS3110, need to increase ADC module, and sample frequency be low, so the volume ratio of whole system is larger.Measuring accuracy particularly for the change of transition small capacitance is not high, poor anti jamming capability, complex circuit designs, and test macro power consumption is also larger.
Transition low capacitance measurement instrument of the present utility model, in order to the difficult problem solving transition low capacitance measurement is developed.The feature of transition low capacitance measurement is that capacitance variations is small, transient state, disposable process are in the majority.Therefore, when technical requirement is very high, this transition low capacitance measurement instrument is surveyed appearance technology photoelectric conversion technique and capacitor discharge and is organically combined, and this instrument has fast response time, and charging is convenient, low in energy consumption, circuit volume is little, and the advantage such as the simple and antijamming capability of logic control is strong, has good development prospect, be particularly suitable for low-power consumption, in the Test Application of bad environments.
Summary of the invention
The purpose of the present utility model is: provide this transition low capacitance measurement instrument to society, the new technology that this measuring instrument adopts photoelectricity to combine with low capacitance measurement, has the advantages such as low in energy consumption, volume is little, it is simple to control, easy to operate, antijamming capability is strong.
The technical solution of the utility model is such: this transition low capacitance measurement instrument, include Instrument shell and metering circuit and software systems, technical characterstic is: described metering circuit is made up of photoelectric source circuit, transition low capacitance measurement circuit, data acquisition memory circuit.Described small capacitances refers to the subtle change of electric capacity, and scope is in PF level.Described transition refers to the dynamic variable quantity of electric capacity.
According to above-described transition low capacitance measurement instrument, technical characterstic also has: the photoelectric source circuit described in a. is a circuit adopting light to make power supply, this circuit form this transition low capacitance measurement instrument self-contained, can continue use, by light self power generation, self-powered and the photoelectric source circuit of automatic control survey, described photoelectric source circuit be one by light generating, power supply the photoelectric source circuit of automatic control survey.Described light selects the light of natural light or artificial light sources, and described natural light is as sunshine, atom light etc., and described artificial light is as electric light, candle light, combustion gas light, fuel oil light etc.B. described transition low capacitance measurement circuit is that a precision compares and measures circuit, and this precision compares and measures circuit by photoelectric source circuit automatic control survey and is made up of sophisticated signal input end, standard comparing circuit, measured comparator circuit, measuring and amplifying circuit and output terminal.Described precision compares and measures the circuit that circuit is a high-precision meticulous comparison, precision measurement.C. described data acquisition memory circuit is a precision data store circuit, and the input of this precision data store circuit connects measuring and amplifying circuit and exports and be made up of precision data Acquisition Circuit, precision data memory circuit and automatically controlled running by photoelectric source circuit.
According to above-described transition low capacitance measurement instrument, technical characterstic also has: described photoelectric source circuit is made up of photoelectric control on-off circuit, light electricity-generating circuit, feed circuit, wherein photoelectric control on-off circuit is the on-off circuit that light-operated, an automatically controlled double control automatically switches or changes, and described photoelectric control on-off circuit is a light signal, the automatic switchover of electric signal double control or the on-off circuit of conversion.Light electricity-generating circuit is made up of the optical trigger of silicon photocell and control thereof, and feed circuit are made up of the booster circuit with mu balanced circuit and voltage output end.
According to above-described transition low capacitance measurement instrument, technical characterstic also has: the light electricity-generating circuit described in a. is made up of the optical trigger of silicon photocell and its control and light trigger pip output terminal, the light that silicon photocell has illumination loophole to make light generating input and optical trigger triggers input, the output of silicon photocell connects the input of feed circuit, triggers by the light of optical trigger the light-operated automatic switchover or the switching signal that export and make photoelectric control on-off circuit.The booster circuit input of b. described feed circuit connects the output of silicon photocell, the output of booster circuit connects the input of power supply electric capacity, the output of power supply electric capacity connects the switch stiff end of photoelectric control on-off circuit, and each measurement of feed circuit, collection, memory circuit feeder ear are another switching over ends of photoelectric control on-off circuit.C. described photoelectric control on-off circuit be one light-operated, the two on-off circuit switching or change of hilted broadsword that automatically controlled double control is changed automatically, namely be a single-pole double-throw switch (SPDT) circuit, the hilted broadsword of this on-off circuit is two switches the output voltage signal end that stiff end is power supply electric capacity, the two switch terminal switched of hilted broadsword is sophisticated signal input end, this sophisticated signal input end connects the accurate standard comparing circuit comparing and measuring circuit, the charging input end of measured comparator circuit, two another switch terminal switched of hilted broadsword is each measurement of feed circuit, gather, the feeder ear of memory circuit, when feed circuit voltage lower than send during voltage of voltage regulation automatically controlled signal make the hilted broadsword of the two switching switch circuit of hilted broadsword two switch stiff end-power supply electric capacity output voltage signal end and another switch terminal-respectively measure, gather, the feeder ear of memory circuit disconnects and automatically switches or be transformed into a switch terminal-sophisticated signal input end, and then connect the accurate standard comparing circuit comparing and measuring circuit, the charging input end of measured comparator circuit, send optically-controlled signal when the light of optical trigger triggers to export the two stiff end that switches of the hilted broadsword of the two switching switch circuit of hilted broadsword is powered the output voltage signal end of electric capacity and a switch terminal-sophisticated signal input end, and then compare and measure the standard comparing circuit of circuit with precision, the charging input end of measured comparator circuit automatically switches or conversion disconnects, and with another switch terminal-respectively measure, gather, the feeder ear communications and liaison of memory circuit.
According to above-described transition low capacitance measurement instrument, technical characterstic also has: the two on-off circuit switched or change of the hilted broadsword described in a. makes the output voltage signal end of power supply electric capacity connect with sophisticated signal input end under automatically controlled signal controls, and then compare and measure the standard comparing circuit of circuit with precision, the charging input end of measured comparator circuit connects, the measured capacitance of the standard capacitance and measured comparator circuit that precision are compared and measured to the standard comparing circuit of circuit is charged simultaneously.B. described hilted broadsword is two to be switched or the on-off circuit of conversion makes the output voltage signal end of stiff end-power supply electric capacity and a switch terminal-sophisticated signal input end automatically switch or change to disconnect under light optically-controlled signal controls, namely and then with precision the standard comparing circuit of circuit is compared and measured, the charging input end of measured comparator circuit disconnects, hilted broadsword is simultaneously two to be switched or the on-off circuit of conversion makes another switch terminal of the output voltage signal end of stiff end-power supply electric capacity and described hilted broadsword pair switching switch circuit-respectively measure under optically-controlled signal controls, gather, the feeder ear of memory circuit automatically switches or conversion communications and liaison, the measured capacitance of standard capacitance and measured comparator circuit that precision compares and measures the standard comparing circuit of circuit is discharged simultaneously and measures, simultaneously the accurate measuring and amplifying circuit comparing and measuring circuit union of powering amplifies, precision data Acquisition Circuit is powered and data acquisition, precision data memory circuit is powered and data store.
According to above-described transition low capacitance measurement instrument, technical characterstic also has: the sophisticated signal input end described in a. is made up of Voltage stabilizing module, this module exports and connects the accurate standard comparing circuit comparing and measuring circuit respectively, measured comparator circuit, these two comparator circuits are the charge-discharge circuits composed in parallel by standard capacitance and measured capacitance, during charging, standard capacitance and measured capacitance fill to obtain the equal voltage of precision, during electric discharge, standard capacitance and measured capacitance are according to the different electric discharge of respective capacitance, standard capacitance, measured capacitance is the synchronous real-time relatively also input measurement amplifying circuit operation amplifier of voltage atdischarge end value separately, it is mainly to form that described measuring and amplifying circuit amplifies integration module by digital operation.A precision measurement of b. described measured capacitance only needs a complete discharge process, also the once complete charge and discharge process of i.e. measured capacitance, and this precision measurement coordinates enforcement jointly by each metering circuit of hardware of this transition low capacitance measurement instrument and software systems.
According to above-described transition low capacitance measurement instrument, technical characterstic also has: described synchronous in real time relatively and to be standard capacitance with testing capacitance once the discharge synchronous capacitive differential compared in real time of input measurement amplifying circuit, thus achieve transition low capacitance measurement and obtain measurement result.
Transition low capacitance measurement instrument advantage of the present utility model has: 1. transition low capacitance measurement instrument of the present utility model only needs standard capacitance and testing capacitance to carry out a charging and discharging, gather the change that a time capacitor discharge signal just can reflect small capacitance, greatly reduce like this requirement of measuring instrument sample frequency, also reduce the power consumption of measuring instrument.2. transition low capacitance measurement instrument of the present utility model adopts photoelectricity triggering technique transient response fast, and logic control is simple.3. transition low capacitance measurement instrument of the present utility model adopts light charging, bulky capacitor electric discharge, and this measuring instrument is charged convenient, circuit is simple, and volume is little.Transition low capacitance measurement instrument of the present utility model is worth adopting and promoting.
Accompanying drawing explanation
Figure of description of the present utility model has 1 width:
Fig. 1 is transition low capacitance measurement instrument structured flowchart.
In FIG: 1. silicon photocell; 2. be with the booster circuit of mu balanced circuit; 3. power supply electric capacity; 4. single-pole double-throw change-over switch; 5. Voltage stabilizing module; 6. standard capacitance; 7. measured capacitance; 8. measuring and amplifying circuit; 9. precision data Acquisition Circuit; 10. precision data memory circuit; 11. data acquisition memory circuits; 12. power management modules; 13. optical triggers; 14. photoelectric source circuit; 15. host computers.
Embodiment
Transition low capacitance measurement instrument non-limiting examples of the present utility model is as follows:
Embodiment one. transition low capacitance measurement instrument
This transition low capacitance measurement instrument of this example includes Instrument shell and metering circuit and software systems, and described small capacitances refers to the subtle change of electric capacity, and scope is in PF level, and described transition refers to the dynamic variable quantity of electric capacity.The metering circuit of this example is made up of photoelectric source circuit, transition low capacitance measurement circuit, data acquisition memory circuit.This measuring instrument concrete structure is illustrated by Fig. 1, Fig. 1 illustrates transition low capacitance measurement instrument structured flowchart, in FIG: 1 is silicon photocell, 2 is the booster circuits being with mu balanced circuit, 3 is power supply electric capacity, and 4 is single-pole double-throw change-over switch, and 5 is Voltage stabilizing modules, 6 is standard capacitances, 7 is measured capacitance, and 8 is measuring and amplifying circuit, and 9 is precision data Acquisition Circuit, 10 is precision data memory circuits, 11 is data acquisition memory circuits, and 12 is power management modules, and 13 is optical triggers, 14 is photoelectric source circuit, and 15 is host computers.The photoelectric source circuit 14 of this example is a circuit adopting light to make power supply, this circuit form this transition low capacitance measurement instrument self-contained, can continue use, by light self power generation, self-powered and the photoelectric source circuit of automatic control survey.The light of this example selects the light of natural light or artificial light sources, and described natural light is as sunshine, atom light etc., and described artificial light is as electric light, candle light, combustion gas light, fuel oil light etc.The transition low capacitance measurement circuit of this example is that a precision compares and measures circuit, and this precision compares and measures circuit by photoelectric source circuit 14 automatic control survey and is made up of sophisticated signal input end, standard comparing circuit, measured comparator circuit, measuring and amplifying circuit 8 and output terminal.The precision of this example compares and measures the circuit that circuit is a high-precision meticulous comparison, precision measurement.The data acquisition memory circuit 11 of this example is a precision data store circuit, and the input of this precision data store circuit connects the output of measuring and amplifying circuit 8 and is made up of precision data Acquisition Circuit 9, precision data memory circuit 10 and automatically controlled running by photoelectric source circuit 14.The photoelectric source circuit 14 of this example is made up of photoelectric control on-off circuit, light electricity-generating circuit, feed circuit, and wherein photoelectric control on-off circuit is the on-off circuit that light-operated, an automatically controlled double control automatically switches or changes.The photoelectric control on-off circuit of this example is a light signal, the automatic switchover of electric signal double control or the on-off circuit of conversion.Light electricity-generating circuit is made up of the optical trigger 13 of silicon photocell 1 and control thereof, and feed circuit are made up of the booster circuit 2 with mu balanced circuit and voltage output end.The light electricity-generating circuit of this example is made up of the optical trigger 13 of silicon photocell 1 and its control and light trigger pip output terminal, the light that silicon photocell 1 has illumination loophole to make light generating input and optical trigger 13 triggers input, the output of silicon photocell 1 connects the input of feed circuit, triggers by the light of optical trigger 13 the light-operated automatic switchover or the switching signal that export and make photoelectric control on-off circuit.The booster circuit input of the feed circuit of this example connects the output of silicon photocell 1, the output of booster circuit connects the input of power supply electric capacity 3, the output of power supply electric capacity 3 connects the switch stiff end of photoelectric control on-off circuit, and each measurement of feed circuit, collection, memory circuit feeder ear are another switching over ends of photoelectric control on-off circuit.The photoelectric control on-off circuit of this example be one light-operated, the two on-off circuit switching or change of hilted broadsword that automatically controlled double control is changed automatically, namely be a single-pole double-throw switch (SPDT) circuit, the hilted broadsword of this on-off circuit is two switches the output voltage signal end that stiff end is power supply electric capacity 3, the two switch terminal switched of hilted broadsword is sophisticated signal input end, this sophisticated signal input end connects the accurate standard comparing circuit comparing and measuring circuit, the charging input end of measured comparator circuit, two another switch terminal switched of hilted broadsword is each measurement of feed circuit, gather, the feeder ear of memory circuit.When feed circuit voltage lower than send during voltage of voltage regulation automatically controlled signal make the hilted broadsword of the two switching switch circuit of hilted broadsword two switch stiff end-power supply electric capacity 3 output voltage signal end and another switch terminal-respectively measure, gather, the feeder ear of memory circuit disconnects and automatically switches or be transformed into a switch terminal-sophisticated signal input end, and then connect the accurate standard comparing circuit comparing and measuring circuit, the charging input end of measured comparator circuit, when the light of optical trigger 13 trigger export send optically-controlled signal make the hilted broadsword of the two switching switch circuit of hilted broadsword two switch stiff end-power supply electric capacity 3 output voltage signal end and a switch terminal-sophisticated signal input end automatically switch or change and disconnect, namely and then with precision the standard comparing circuit of circuit is compared and measured, the charging input end of measured comparator circuit disconnects, and with another switch terminal-respectively measure, gather, the feeder ear communications and liaison of memory circuit.The two on-off circuit switched or change of hilted broadsword of this example makes the output voltage signal end of power supply electric capacity 3 connect with sophisticated signal input end under automatically controlled signal controls, and then compare and measure the standard comparing circuit of circuit with precision, the charging input end of measured comparator circuit connects, the measured capacitance 7 of the standard capacitance 6 and measured comparator circuit that precision are compared and measured to the standard comparing circuit of circuit is charged simultaneously.The two on-off circuit switched or change of hilted broadsword of this example makes output voltage signal end and the sophisticated signal input end of stiff end-power supply electric capacity 3 under light optically-controlled signal controls, and then compare and measure the standard comparing circuit of circuit with precision, the charging input end of measured comparator circuit automatically switches or conversion disconnects, hilted broadsword is simultaneously two to be switched or the on-off circuit of conversion makes another switch terminal of the output voltage signal end of stiff end-power supply electric capacity 3 and described hilted broadsword pair switching switch circuit-respectively measure under optically-controlled signal controls, gather, the feeder ear of memory circuit automatically switches or conversion communications and liaison, the measured capacitance 7 of standard capacitance 6 and measured comparator circuit that precision compares and measures the standard comparing circuit of circuit is discharged simultaneously and measures, simultaneously the accurate measuring and amplifying circuit 8 comparing and measuring circuit union of powering amplifies, precision data Acquisition Circuit 9 is powered and data acquisition, precision data memory circuit 10 is powered and data store.The sophisticated signal input end of this example is made up of Voltage stabilizing module 5, this module exports and connects the accurate standard comparing circuit comparing and measuring circuit respectively, measured comparator circuit, these two comparator circuits are the charge-discharge circuits composed in parallel by standard capacitance 6 and measured capacitance 7, during charging, standard capacitance and measured capacitance fill to obtain the equal voltage of precision, during electric discharge, standard capacitance and measured capacitance are according to the different electric discharge of respective capacitance, standard capacitance 6, measured capacitance 7 is synchronous real-time relatively also input measurement amplifying circuit 8 operation amplifier of voltage atdischarge end value separately, it is mainly to form that the measuring and amplifying circuit 8 of this example amplifies integration module by digital operation.A precision measurement of the measured capacitance of this example only needs a complete discharge process, also the once complete charge and discharge process of i.e. measured capacitance 7, and this precision measurement coordinates enforcement jointly by each metering circuit of hardware of this transition low capacitance measurement instrument and software systems.This example synchronous in real time relatively and to be standard capacitance 6 with testing capacitance 7 once the discharge synchronous capacitive differential compared in real time of input measurement amplifying circuit 8, thus achieve transition low capacitance measurement and obtain measurement result.Each electronic circuit of the transition low capacitance measurement instrument of this example all can adopt known and commercially electronic devices and components assembling to make, as long as can realize all can using of the function of each electronic circuit.
Embodiment two. transition low capacitance measurement instrument
This transition low capacitance measurement instrument concrete structure of this example is illustrated by Fig. 1, and the transition low capacitance measurement instrument of this example and the transition low capacitance measurement instrument difference of embodiment one have: the measuring and amplifying circuit of this example selects instrument amplification chip AD8231 etc.The transition low capacitance measurement instrument of this example all the other do not state, be entirely same as described in embodiment one, no longer repeat.
Claims (5)
1. a transition low capacitance measurement instrument, includes Instrument shell and metering circuit, is characterised in that: described metering circuit is made up of photoelectric source circuit, transition low capacitance measurement circuit, data acquisition memory circuit;
A. described photoelectric source circuit is a circuit adopting light to make power supply, this circuit form this transition low capacitance measurement instrument self-contained, can continue use, by light self power generation, self-powered and the photoelectric source circuit of automatic control survey, described light selects the light of natural light or artificial light sources;
B. described transition low capacitance measurement circuit is that a precision compares and measures circuit, and this precision compares and measures circuit by photoelectric source circuit automatic control survey and is made up of sophisticated signal input end, standard comparing circuit, measured comparator circuit, measuring and amplifying circuit and output terminal;
C. described data acquisition memory circuit is a precision data store circuit, and the input of this precision data store circuit connects measuring and amplifying circuit and exports and be made up of precision data Acquisition Circuit, precision data memory circuit and automatically controlled running by photoelectric source circuit;
Described photoelectric source circuit is made up of photoelectric control on-off circuit, light electricity-generating circuit, feed circuit, wherein photoelectric control on-off circuit is the on-off circuit that light-operated, an automatically controlled double control automatically switches or changes, light electricity-generating circuit is made up of the optical trigger of silicon photocell and control thereof, and feed circuit are made up of the booster circuit with mu balanced circuit and voltage output end.
2. transition low capacitance measurement instrument according to claim 1, is characterised in that:
A. described light electricity-generating circuit is made up of the optical trigger of silicon photocell and its control and light trigger pip output terminal, the light that silicon photocell has illumination loophole to make light generating input and optical trigger triggers input, the output of silicon photocell connects the input of feed circuit, triggers by the light of optical trigger the light-operated automatic switchover or the switching signal that export and make photoelectric control on-off circuit;
The booster circuit input of b. described feed circuit connects the output of silicon photocell, the output of booster circuit connects the input of power supply electric capacity, the output of power supply electric capacity connects the switch stiff end of photoelectric control on-off circuit, and each measurement of feed circuit, collection, memory circuit feeder ear are another switching over ends of photoelectric control on-off circuit;
C. described photoelectric control on-off circuit be one light-operated, the two on-off circuit switching or change of hilted broadsword that automatically controlled double control is changed automatically, the hilted broadsword of this on-off circuit is two switches the output voltage signal end that stiff end is power supply electric capacity, the two switch terminal switched of hilted broadsword is sophisticated signal input end, this sophisticated signal input end connects the accurate standard comparing circuit comparing and measuring circuit, the charging input end of measured comparator circuit, two another switch terminal switched of hilted broadsword is each measurement of feed circuit, gather, the feeder ear of memory circuit, when feed circuit voltage lower than send during voltage of voltage regulation automatically controlled signal make the hilted broadsword of the two switching switch circuit of hilted broadsword two switch stiff end-power supply electric capacity output voltage signal end and another switch terminal-respectively measure, gather, the feeder ear of memory circuit disconnects and automatically switches or be transformed into a switch terminal-sophisticated signal input end, and then connect the accurate standard comparing circuit comparing and measuring circuit, the charging input end of measured comparator circuit, send optically-controlled signal when the light of optical trigger triggers to export the two stiff end that switches of the hilted broadsword of the two switching switch circuit of hilted broadsword is powered the output voltage signal end of electric capacity and a switch terminal-sophisticated signal input end, and then compare and measure the standard comparing circuit of circuit with precision, the charging input end of measured comparator circuit automatically switches or conversion disconnects, and with another switch terminal-respectively measure, gather, the feeder ear communications and liaison of memory circuit.
3. transition low capacitance measurement instrument according to claim 2, is characterised in that:
A. the two on-off circuit switched or change of described hilted broadsword makes the output voltage signal end of power supply electric capacity connect with sophisticated signal input end under automatically controlled signal controls, and then compare and measure the standard comparing circuit of circuit with precision, the charging input end of measured comparator circuit connects, the measured capacitance of the standard capacitance and measured comparator circuit that precision are compared and measured to the standard comparing circuit of circuit is charged simultaneously;
B. described hilted broadsword is two to be switched or the on-off circuit of conversion makes the output voltage signal end of stiff end-power supply electric capacity and a switch terminal-sophisticated signal input end automatically switch or change to disconnect under light optically-controlled signal controls, namely and then with precision the standard comparing circuit of circuit is compared and measured, the charging input end of measured comparator circuit disconnects, hilted broadsword is simultaneously two to be switched or the on-off circuit of conversion makes another switch terminal of the output voltage signal end of stiff end-power supply electric capacity and described hilted broadsword pair switching switch circuit-respectively measure under optically-controlled signal controls, gather, the feeder ear of memory circuit automatically switches or conversion communications and liaison, the measured capacitance of standard capacitance and measured comparator circuit that precision compares and measures the standard comparing circuit of circuit is discharged simultaneously and measures, simultaneously the accurate measuring and amplifying circuit comparing and measuring circuit union of powering amplifies, precision data Acquisition Circuit is powered and data acquisition, precision data memory circuit is powered and data store.
4. transition low capacitance measurement instrument according to claim 3, is characterised in that:
A. described sophisticated signal input end is made up of Voltage stabilizing module, this module exports and connects the accurate standard comparing circuit comparing and measuring circuit respectively, measured comparator circuit, these two comparator circuits are the charge-discharge circuits composed in parallel by standard capacitance and measured capacitance, during charging, standard capacitance and measured capacitance fill to obtain the equal voltage of precision, during electric discharge, standard capacitance and measured capacitance are according to the different electric discharge of respective capacitance, standard capacitance, measured capacitance is the synchronous real-time relatively also input measurement amplifying circuit operation amplifier of voltage atdischarge end value separately, it is mainly to form that described measuring and amplifying circuit amplifies integration module by digital operation,
A precision measurement of b. described measured capacitance only needs a complete discharge process, and be also the once complete charge and discharge process of measured capacitance, this precision measurement coordinates enforcement jointly by each metering circuit of hardware of this transition low capacitance measurement instrument.
5. transition low capacitance measurement instrument according to claim 4, is characterised in that: described synchronous in real time relatively and to be standard capacitance with testing capacitance once the discharge synchronous capacitive differential compared in real time of input measurement amplifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201420470256.4U CN204214952U (en) | 2014-08-20 | 2014-08-20 | Transition low capacitance measurement instrument |
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| CN201420470256.4U CN204214952U (en) | 2014-08-20 | 2014-08-20 | Transition low capacitance measurement instrument |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155529A (en) * | 2014-08-20 | 2014-11-19 | 中北大学 | Transient small capacitance measuring instrument |
| CN105974203A (en) * | 2016-06-24 | 2016-09-28 | 武汉精测电子技术股份有限公司 | Micro-capacitance measurement method and device |
| CN109342827A (en) * | 2018-11-22 | 2019-02-15 | 湖南恩智测控技术有限公司 | A kind of circuit and method exchanging charge and discharge electrical measurement capacitance by capacitor |
-
2014
- 2014-08-20 CN CN201420470256.4U patent/CN204214952U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155529A (en) * | 2014-08-20 | 2014-11-19 | 中北大学 | Transient small capacitance measuring instrument |
| CN105974203A (en) * | 2016-06-24 | 2016-09-28 | 武汉精测电子技术股份有限公司 | Micro-capacitance measurement method and device |
| CN105974203B (en) * | 2016-06-24 | 2018-10-02 | 武汉精测电子集团股份有限公司 | A kind of micro capacitance method and device |
| CN109342827A (en) * | 2018-11-22 | 2019-02-15 | 湖南恩智测控技术有限公司 | A kind of circuit and method exchanging charge and discharge electrical measurement capacitance by capacitor |
| CN109342827B (en) * | 2018-11-22 | 2024-03-29 | 湖南恩智测控技术有限公司 | Circuit and method for measuring capacitance value through capacitance alternating current charge and discharge |
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