CN107219402B - A kind of circuit for quick measurement of DC resistance for power module port - Google Patents
A kind of circuit for quick measurement of DC resistance for power module port Download PDFInfo
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- CN107219402B CN107219402B CN201710423614.4A CN201710423614A CN107219402B CN 107219402 B CN107219402 B CN 107219402B CN 201710423614 A CN201710423614 A CN 201710423614A CN 107219402 B CN107219402 B CN 107219402B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/002—Switches for altering the measuring range or for multitesters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/08—Circuits for altering the measuring range
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21137—Analog to digital conversion, ADC, DAC
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2604—Test of external equipment
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention relates to a kind of circuit for quick measurement of DC resistance for power module port, including feedback regulating circuit, range switching matrix circuit and voltage and current detection circuit；The input of the feedback regulating circuit terminates a bias voltage, output end is connect with the input terminal of range switching matrix circuit, range switching matrix circuit is for connecting voltage and current detection circuit and measured device port, voltage and current detection circuit is also connect with measured device port, the voltage and current detection circuit is connect with external microcontroller, and bias voltage is exported by microprocessor control DAC1.The present invention is a kind of simple and practical circuit, applied to fast-speed direct current resistance measurement, to the measurement fast and stable of various capacitance-resistance parallel connection direct resistance, time of measuring is hardly influenced by the resistance capacitance of measurand, adjustable bias can anti-output overvoltage, using the concatenated multrirange structure of measuring resistance, more large-scale D.C. resistance can be measured, accuracy is high.
Description
Technical field
The invention patent relates to a kind of circuit for quick measurement of DC resistance for power module port.
Background technique
The concept of D.C. resistance is widely present in electronic information field, and power module port D.C. resistance is reflection power supply mould
Important parameter of block performance, including the forward and reverse D.C. resistance of input/output port, the end S D.C. resistance etc., these parameters are all sentenced
The important evidence of deenergizing performance.Since there are large capacity shunt capacitance and filter capacitor, resistances for power module input/output port
Holding parallel connection direct resistance becomes the important object that power module measures.The conventional method for surveying D.C. resistance is constant flow method and perseverance
Piezoresistance divides method.Constant flow method circuit is generally more complex, is commonly used in desk-top multimeter, by using certain constant current
Measured piece is measured, and detects its both end voltage and measurement result is calculated, however due to the big resistance capacitance of measured piece
And the influence of current source charging inertia, the time that measurement reaches stable is very long, and process is slow, in the overall situation of large-scale production
Under, seriously hinder the raising of production efficiency.Further, since being measured using constant current, the voltage being tested on port is uncontrollable, for
The device of low pressure output may generate over-voltage damage circuit devcie port in measurement process.Constant pressure rule passes through resistance point
Pressure mode measures, and circuit is simple, is usually used in handheld multimeter, for the measurement in big resistance capacitance parallel connection situation according to
It is very long that so there are time of measuring, and the uncontrollable situation of measurement bias voltage exists.The power module port D.C. resistance is quickly surveyed
Measure circuit innovative and significant application value with higher.
Summary of the invention
In order to overcome the above problem, the present invention provides a kind of practical power module port quick measurement of DC resistance electricity
Road.The circuit measuring fast and stable；Measurement efficiency is not influenced by tested port difference, adapts to various measurands；Biased electrical
Press it is adjustable, can prevent output overvoltage damage low pressure measured piece；Measuring circuit has multiple ranges, improves circuit measuring precision.
Fast with measuring speed, measurement stability is good, the advantages of good measuring accuracy, adaptability and strong antijamming capability.
What the purpose of the present invention was realized by following technical solution: a kind of D.C. resistance for power module port is fast
Fast measuring circuit, including feedback regulating circuit, range switching matrix circuit and voltage and current detection circuit；The feedback regulation electricity
The input on road terminates a bias voltage, and output end is connect with the input terminal of range switching matrix circuit, range switching matrix circuit
For connecting voltage and current detection circuit and measured device port, voltage and current detection circuit is also connect with measured device port,
The voltage and current detection circuit is connect with external microcontroller, and bias voltage is exported by microprocessor control DAC1.
Further, the feedback regulating circuit includes integrated transporting discharging U2, capacitor C1, capacitor C2, resistance R1 and resistance R8, institute
State resistance R8 and capacitor C2 composition single order RC filter circuit, conduct after the output that microcontroller controls DAC1 is filtered by single order RC
Bias voltage accesses the non-inverting input terminal of integrated transporting discharging U2, and the output end of integrated transporting discharging U2 is connected to integrated transporting discharging by resistance R1
The inverting input terminal of U2, the capacitor C1 are parallel between the output end and inverting input terminal of integrated transporting discharging U2, and the one of resistance R1
End is for connecting measured device port.
Further, the range switching matrix circuit includes resistance R2~R4, switch module I and switch module II；It is described
One end of resistance R4 is connect with the output end of integrated transporting discharging U2, and resistance R4, switch module I and switch module II are sequentially connected in series company
It connects, switch module II is connect with measured device port；The resistance R2 is parallel to the both ends of switch module I, and resistance R3 is parallel to
The both ends of switch module II.
Further, the switch module I includes relay K1, diode D3, resistance R7, resistance R11 and triode Q2, institute
Stating switch module II includes relay K2, diode D2, resistance R6, resistance R10 and triode Q1；The contact of the relay K1
In parallel with resistance R3, diode D3 is parallel to the coil both ends of relay K1；The collector and diode D3 of triode Q2 is just
Pole connection, emitter ground connection, base stage are connect with one end of resistance R7, and the other end of resistance R7 is connect with I/O port, and the one of resistance R10
End is connect with the end IO, the other end ground connection of resistance R10；The contact of the relay K2 is in parallel with resistance R2, and diode D2 is in parallel
In the coil both ends of relay K1；The collector of triode Q1 is connect with the anode of diode D2, emitter ground connection, base stage and electricity
One end connection of R6 is hindered, the other end of resistance R6 is connect with I/O port, and one end of resistance R11 is connect with I/O port, and resistance R11's is another
End ground connection；The cathode of diode D2 connect with the cathode of diode D3 and is followed by power supply VCC.
Further, the voltage and current detection circuit includes ADC U1, resistance R5 and resistance R9, the resistance R5 and resistance
R9 connects and is grounded, and the benchmark input end of the ADC U1 is connect with the common end of the output end of amplifier U2 and resistance R4, ADC
The signal acquisition terminal of U1 is for connecting measured piece port；The resistance R5 is connect with the common end of resistance R9 with ADC0.
Further, measuring circuit further includes diode D1 and diode D4, the plus earth of the diode D4, diode
The cathode of D4 is connect with the anode of diode D1, and the cathode of diode D1 meets power supply VCC, and diode D1 is public with diode D4's
End is connect with the output end of amplifier U2.
Due to using above technical scheme, the present invention has following advantageous effects:
The present invention is a kind of simple and practical circuit, is applied to fast-speed direct current resistance measurement, to various capacitance-resistance parallel connection directs
The measurement fast and stable of resistance, time of measuring are hardly influenced by the resistance capacitance of measurand, and adjustable bias anti-can export
Pressure can measure more large-scale D.C. resistance using the concatenated multrirange structure of measuring resistance, and accuracy is high.The circuit
Control can be carried out in conjunction with micro-control unit and data processing, scalability are good.
Detailed description of the invention
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
The detailed description of one step, in which:
Fig. 1 is power module port circuit for quick measurement of DC resistance schematic block diagram in embodiment；
Fig. 2 is the schematic diagram of power module port circuit for quick measurement of DC resistance in embodiment；
Fig. 3 is stable pair of the measurement result of rapid survey circuit and other direct current resistance m easurem ent modes output in embodiment
Than；
Fig. 4 is the representative value and range ability relationship of embodiment Plays resistance.
Specific embodiment
Below with reference to attached drawing, a preferred embodiment of the present invention will be described in detail；It should be appreciated that preferred embodiment
Only for illustrating the present invention, rather than limiting the scope of protection of the present invention.
The schematic block circuit diagram of the present embodiment is as shown in Figure 1, microcontroller is passed through by bus communication setting bias voltage
Feedback regulating circuit stablizes the fixed low bias voltage of output, and after amplifier output end is stablized, microcontroller is acquired by external ADC
The voltage of amplifier output end, and adjust suitable range according to testing result, finally by internal high position ADC examination criteria resistance with
The voltage ratio of tested port calculates DC resistance.
Power module port circuit for quick measurement of DC resistance schematic diagram is as shown in Figure 1, a kind of be used for power module port
Circuit for quick measurement of DC resistance, including feedback regulating circuit, range switching matrix circuit and voltage and current detection circuit；Institute
The input for stating feedback regulating circuit terminates a bias voltage, and output end is connect with the input terminal of range switching matrix circuit, range
Switching matrix circuit for connecting voltage and current detection circuit and measured device port, voltage and current detection circuit also with tested device
The connection of part port, the voltage and current detection circuit are connect with external microcontroller, and bias voltage controls DAC1 by microprocessor
Output.
The feedback regulating circuit includes integrated transporting discharging U2, capacitor C1, capacitor C2, resistance R1 and resistance R8, the resistance
R8 and capacitor C2 forms single order RC filter circuit, and the output that microcontroller controls DAC1 is used as biased electrical after filtering by single order RC
The non-inverting input terminal into integrated transporting discharging U2 is crimped, the output end of integrated transporting discharging U2 is connected to the anti-of integrated transporting discharging U2 by resistance R1
Phase input terminal, the capacitor C1 are parallel between the output end and inverting input terminal of integrated transporting discharging U2, and one end of resistance R1 is used for
Connect measured device port.
The range switching matrix circuit includes resistance R2~R4, switch module I and switch module II；The resistance R4's
One end is connect with the output end of integrated transporting discharging U2, and resistance R4, switch module I and switch module II are sequentially connected in series, switching molding
Block II is connect with measured device port；The resistance R2 is parallel to the both ends of switch module I, and resistance R3 is parallel to switch module II
Both ends.
The switch module I includes relay K1, diode D3, resistance R7, resistance R11 and triode Q2, the switch
Module ii includes relay K2, diode D2, resistance R6, resistance R10 and triode Q1；The contact of the relay K1 and resistance
R3 is in parallel, and diode D3 is parallel to the coil both ends of relay K1；The collector of triode Q2 is connect with the anode of diode D3,
Emitter ground connection, base stage are connect with one end of resistance R7, and the other end of resistance R7 is connect with I/O port, one end of resistance R10 and IO
End connection, the other end ground connection of resistance R10；The contact of the relay K2 is in parallel with resistance R2, and diode D2 is parallel to relay
The coil both ends of device K1；The collector of triode Q1 is connect with the anode of diode D2, and emitter ground connection, base stage is with resistance R6's
One end connection, the other end of resistance R6 are connect with I/O port, and one end of resistance R11 is connect with I/O port, another termination of resistance R11
Ground；The cathode of diode D2 connect with the cathode of diode D3 and is followed by power supply VCC.
The voltage and current detection circuit includes ADC U1, resistance R5 and resistance R9, and the resistance R5 connects with resistance R9
And be grounded, the benchmark input end of the ADC U1 is connect with the common end of the output end of amplifier U2 and resistance R4, the letter of ADC U1
Number collection terminal is for connecting measured piece port；The resistance R5 is connect with the common end of resistance R9 with ADC0.
Measuring circuit further includes diode D1 and diode D4, and the plus earth of the diode D4, diode D4's is negative
Pole is connect with the anode of diode D1, and the cathode of diode D1 connects common end and the fortune of power supply VCC, diode D1 and diode D4
Put the output end connection of U2.
Microcontroller controls and accesses integrated transporting discharging U2's as measurement bias voltage after DAC1 output is filtered by single order RC
Non-inverting input terminal, integrated transporting discharging U2 output end constitute negative voltage feedback by the inverting input terminal that resistance R1 is connected to amplifier.Amount
Mode of the journey switching matrix circuit using series connection stepping, microcontroller control IO control port driving relay completion resistance measurement
The switching of range.Microcontroller communicates the voltage of measurement standard resistance and tested port by spi bus and high position adc circuit U1
Ratio.The clamp circuit of abnormal input voltage protection is constituted using diode D1, D4.Pass through ADC0 by resistance R5, R9 partial pressure
The output end voltage for measuring integrated transporting discharging U2 adjusts measuring range in real time, improves measurement accuracy.
In the present invention, it is tested the calculation formula of port resistance value are as follows:
In formula: RxTo be tested port resistance value, unit Ω；
N is the conversion digit of adc circuit U1, no unit；
D is the transformation result that U1 is read, no unit；
RrefFor the corresponding standard electric resistance value of selected range, unit Ω.
Due to the bias voltage measurement that measuring circuit uses in embodiment, U1 is using the reference data voltage to float, reference
Voltage is proportional to tested port voltage, can make full use of the digit of ADC in this way, improves the precision of direct current resistance m easurem ent.
The measurement output of rapid survey circuit and other direct current resistance m easurem ent modes stablizes comparison such as Fig. 3 institute in embodiment
Show, sets that tested port is in parallel with 4700uF capacitor as 10k Ω resistance, and rapid survey circuit criteria resistance is 300 ohm, in addition
Two ways is the constant flow method measurement of the measurement of partial pressure method and 100uA that bias voltage is 3V.It can see power module direct current
The direct current resistance m easurem ent stabilized speed of resistance rapid survey circuit is quickly, steady compared to other two kinds of resistance measurement modes tens seconds
It fixes time and is greatly decreased, so that the measurement efficiency of D.C. resistance improves decades of times or more.
The relationship of the measuring resistance and direct current resistance m easurem ent range selected in embodiment is as shown in figure 4, measuring resistance uses
The case where mode of series connection switching forms matrix, avoids resistive short.3 measuring resistances R4, R2 and R3 are used in embodiment, point
Not Wei 3 Ω, 297 Ω (27 Ω connect to obtain with 270 Ω) and 29.7k Ω (2.7k Ω connects to obtain with 27k Ω), use relay
K1 and K2 carries out the stepping of current measurement, and the measurement range of D.C. resistance is respectively the Ω of 1 Ω~150,100 Ω~15k Ω and 10k
Ω~1.5M Ω.Each range, which is all provided with, outranges range, avoid critical resistance measurement when relay it is unstable repeatedly
Jump, improves measurement stability.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, it is clear that those skilled in the art
Various changes and modifications can be made to the invention by member without departing from the spirit and scope of the present invention.If in this way, of the invention
Within the scope of the claims of the present invention and its equivalent technology, then the present invention is also intended to encompass these to these modifications and variations
Including modification and variation.
Claims (6)
1. a kind of circuit for quick measurement of DC resistance for power module port, it is characterised in that: including feedback regulating circuit,
Range switching matrix circuit and voltage and current detection circuit；The input of the feedback regulating circuit terminates a bias voltage, output
End connect with the input terminal of range switching matrix circuit, range switching matrix circuit be used for connect voltage and current detection circuit and by
Device interface is surveyed, voltage and current detection circuit is also connect with measured device port, and the voltage and current detection circuit and outside are micro-
Controller connection, bias voltage are exported by microprocessor control DAC1, and one end of resistance R1 is micro- for connecting measured device port
Controller controls the switching that IO control port driving relay completes resistance measurement range.
2. a kind of circuit for quick measurement of DC resistance for power module port according to claim 1, feature exist
In: the feedback regulating circuit includes integrated transporting discharging U2, capacitor C1, capacitor C2, resistance R1 and resistance R8, the resistance R8 and electricity
Hold C2 and form single order RC filter circuit, the output that microcontroller controls DAC1 accesses after being filtered by single order RC as bias voltage
The non-inverting input terminal of integrated transporting discharging U2, the output end of integrated transporting discharging U2 are connected to the anti-phase input of integrated transporting discharging U2 by resistance R1
End, the capacitor C1 are parallel between the output end and inverting input terminal of integrated transporting discharging U2.
3. a kind of circuit for quick measurement of DC resistance for power module port according to claim 1, feature exist
In: the range switching matrix circuit includes resistance R2~R4, switch module I and switch module II；One end of the resistance R4
It is connect with the output end of integrated transporting discharging U2, resistance R4, switch module I and switch module II are sequentially connected in series, switch module II
It is connect with measured device port；The resistance R2 is parallel to the both ends of switch module I, and resistance R3 is parallel to the two of switch module II
End.
4. a kind of circuit for quick measurement of DC resistance for power module port according to claim 3, feature exist
In: the switch module I includes relay K1, diode D3, resistance R7, resistance R11 and triode Q2, the switch module II
Including relay K2, diode D2, resistance R6, resistance R10 and triode Q1；The contact of the relay K1 and resistance R3 are simultaneously
Connection, diode D3 are parallel to the coil both ends of relay K1；The collector of triode Q2 is connect with the anode of diode D3, is emitted
Pole ground connection, base stage are connect with one end of resistance R7, and the other end of resistance R7 is connect with microcontroller I/O port, one end of resistance R10
It is connect with microcontroller I/O port, the other end ground connection of resistance R10；The contact of the relay K2 is in parallel with resistance R2, diode
D2 is parallel to the coil both ends of relay K1；The collector of triode Q1 is connect with the anode of diode D2, emitter ground connection, base
Pole is connect with one end of resistance R6, and the other end of resistance R6 is connect with microcontroller I/O port, one end of resistance R11 and microcontroller
I/O port connection, the other end ground connection of resistance R11；The cathode of diode D2 connect with the cathode of diode D3 and is followed by power supply VCC.
5. a kind of circuit for quick measurement of DC resistance for power module port according to claim 4, feature exist
In: the voltage and current detection circuit includes analog-digital converter ADC U1, resistance R5 and resistance R9, the resistance R5 and resistance R9
It connects and is grounded, the common end company of the benchmark input end of the analog-digital converter ADC U1 and the output end of amplifier U2 and resistance R4
It connects, the signal acquisition terminal of analog-digital converter ADC U1 is for connecting measured piece port；The common end of the resistance R5 and resistance R9
It is connect with analog-digital converter ADC0.
6. a kind of circuit for quick measurement of DC resistance for power module port according to claim 4, feature exist
In: measuring circuit further includes diode D1 and diode D4, the plus earth of the diode D4, the cathode of diode D4 and two
The anode connection of pole pipe D1, the cathode of diode D1 connect the common end of power supply VCC, diode D1 and diode D4 with amplifier U2's
Output end connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710423614.4A CN107219402B (en) | 2017-06-07 | 2017-06-07 | A kind of circuit for quick measurement of DC resistance for power module port |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710423614.4A CN107219402B (en) | 2017-06-07 | 2017-06-07 | A kind of circuit for quick measurement of DC resistance for power module port |
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| CN107219402A CN107219402A (en) | 2017-09-29 |
| CN107219402B true CN107219402B (en) | 2019-06-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110488205B (en) | 2018-10-24 | 2021-02-26 | 新华三技术有限公司 | Fault recognition device |
| CN109975616B (en) * | 2018-12-29 | 2021-08-17 | 浙江机电职业技术学院 | Wide-range high-precision resistance tester |
| CN109917306B (en) * | 2019-03-13 | 2021-10-26 | 中国电子科技集团公司第二十四研究所 | Device for testing function of adjusting end of power supply product |
| CN110554241B (en) * | 2019-10-08 | 2020-11-27 | 哈尔滨市科佳通用机电股份有限公司 | Locomotive signal receiving coil insulation resistance on-vehicle test method and device |
| CN110687343A (en) * | 2019-10-22 | 2020-01-14 | 阳光电源股份有限公司 | Leakage current detection method and circuit |
| CN111413547A (en) * | 2020-05-06 | 2020-07-14 | 苏州市运泰利自动化设备有限公司 | Mainboard resistance test system and method |
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|---|---|---|---|---|
| CN201378188Y (en) * | 2009-04-23 | 2010-01-06 | 中南林业科技大学 | Numerically-controlled resistance measurement device |
| CN102539924A (en) * | 2010-12-13 | 2012-07-04 | 北京中科微纳物联网技术股份有限公司 | Wide-range precise measuring circuit for resistance of nano sensor and method |
| CN102253286A (en) * | 2011-06-27 | 2011-11-23 | 郑军 | Resistance/capacitance measuring method and device thereof |
| CN103033677A (en) * | 2012-12-15 | 2013-04-10 | 安徽工程大学 | Range self-adaptation type digital voltmeter and measurement method thereof |
| CN205665316U (en) * | 2016-05-31 | 2016-10-26 | 滁州学院 | Novel resistance automatic measure device |
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