CN105486928B - A kind of thermoelectric material resistivity measurement circuit - Google Patents
A kind of thermoelectric material resistivity measurement circuit Download PDFInfo
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- CN105486928B CN105486928B CN201510833853.8A CN201510833853A CN105486928B CN 105486928 B CN105486928 B CN 105486928B CN 201510833853 A CN201510833853 A CN 201510833853A CN 105486928 B CN105486928 B CN 105486928B
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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
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The invention discloses a kind of thermoelectric material resistivity measurement circuits, including kernel control module, instruction input module, voltage acquisition module, electric current inverting module, reference voltage output module, reference voltage module, series electric circuit negative feedback module, gear selecting module, display module, automatic measurement module and resistivity computing module.After system obtains operational order, the judging result operation electric current direction commutated according to electric current, and export the reference voltage value of setting, the interim constant current of electric current is realized by series electric circuit negative feedback module, gear selecting module is used to adjust the size of constant current, finally by voltage acquisition module collection voltages value, it is used for the calculating of resistivity, and is shown in display module.The present invention provides a measuring circuit small in size, low in energy consumption, safe and stable and with high accuracy for thermoelectric material resistivity measurement, large-scale resistivity measurement may be implemented, while the influence of Seebeck and Peltier effect to thermoelectric material resistivity measurement can be reduced.
Description
Technical field
The present invention relates to measuring technique, electronic circuit technology, pyroelectric material performance testing field, in particular to a kind of thermoelectricity
Resistivity of material measuring circuit.
Background technique
Improve conversion efficiency of thermoelectric be thermoelectric material research critical issue, and the conversion efficiency of thermoelectric of thermoelectric material be by
Thermal conductivity, resistivity and Seebeck coefficient are combined and are obtained, therefore the accurate measurement of resistivity, directly influence pyroelectric material performance
Measurement, and then influence the research of thermoelectric material.Thermoelectric material resistivity is very sensitive to temperature, the rule varied with temperature
Rule is in non-linear, and its resistivity variation with temperature is very big, and even up to six orders of magnitude, the variation of wide-range is to resistivity
It is accurate measurement produce bigger effect.In addition, thermoelectric material is at work, because of the presence of material resistance, additional joule is generated
Heat, Joule heat can not only improve temperature, and can be superimposed with heating source or Peltier heat, while can also generate additional Seebeck
Effect, to influence the precision of pyroelectric material performance measurement.The present invention provides an individual for the measurement of thermoelectric material resistivity
The resistivity measurement of wide-range may be implemented in product small, low-power consumption, safe and stable and high-precision measuring circuit, and measurement span can
From ohm level to mega-ohms, to overcome peltier effect and additional Seebeck effect, the high-precision measurement of thermoelectric material is completed
Work.
Summary of the invention
In order to solve the problems, such as that thermoelectric material resistivity measurement precision is insufficient, the present invention provides a kind of thermoelectric material resistivity
The circuit of measurement, can be realized the resistivity measurement of wide-range, and reduces Seebeck and peltier effect and measure thermoelectric material
Influence, have high-precision, low-power consumption and stably measured feature.
In order to achieve the above object, the invention adopts the following technical scheme:
The present invention provides a kind of thermoelectric material resistivity measurement circuit, including kernel control module, instruction input module, base
Quasi- voltage output module, gear selecting module, electric current inverting module, series electric circuit negative feedback module, voltage centralized procurement module, reference voltage
Module and display module；The kernel control module includes resistivity computing module and automatic measurement module；Described instruction is defeated
Enter module to be connected using serial ports and key with kernel control module；The voltage acquisition module by the way of SPI with core control
Circuit processed is connected；The electric current inverting module is connected with reference voltage output module, series electric circuit negative feedback module；The benchmark
Voltage output module is connected in a manner of SPI with kernel control module；The reference voltage module is directly and voltage acquisition module
It is connected；The series electric circuit negative feedback module and electric current inverting module, voltage acquisition module, gear selecting module and reference voltage export
Module is connected；The gear selecting module is connected with series electric circuit negative feedback module and kernel control module；The display module is with I2C
Mode be connected with kernel control module；The automatic measurement module and resistivity computing module are embedded in kernel control module；
The kernel control module has communication function and control function；The communication function includes receiving instruction and data
It sends；The input for receiving instruction and being used for parameter and instruction, and according to the input of parameter and instruction, extract corresponding effective number
Value finds out the operation for needing to complete in next step then according to instruction search operation list；What the data transmission was used to acquire
Voltage data, gear selecting data, reference voltage data and resistivity calculated value etc. are transmitted to host computer in the form of serial ports；The control
Function processed is for controlling voltage acquisition module, electric current inverting module, reference voltage output module, display module, automatic measurement mould
Block and gear selecting module make system execute task by operation order, keep the high efficiency and stability of system；
Described instruction input module is connected using serial ports and key with kernel control module, realizes human-computer interaction function；
The reference voltage output module is used for outputting reference voltage value, and approaches the reference voltage value of setting input, will
Reference voltage value is exported into series electric circuit negative feedback module, the reference voltage as operational amplifier positive input terminal；
Sampling resistor during resistivity measurement automatically selecting or manually selecting for circuit for the gear selecting module, needs
The digital switch of low on-resistance is wanted to complete operation, excess loss caused by reducing because of conducting resistance improves measurement accuracy；
Whether the electric current inverting module meets electric current commutating period for decision circuitry, if meeting the requirements, changes stream
Current direction through measured resistance；If not meeting, primary current direction is kept；In addition, the frequency for changing current direction is controllable
, frequency can be changed by instruction input；
The series electric circuit negative feedback module include operational amplifier U1, measured resistance RX and sampling resistor R0, U1 just
The voltage output of input termination reference voltage output module, wherein one end of the output termination measured resistance RX of U1, measured resistance
One end of the other end sampling resistor R0 of RX and the negative input end of U1, and the other end of sampling resistor R0 is grounded；Current-series are negative
Feedback module is used to provide the constant current value calculated to measured resistance, constant process be it is interim, and it is non-constant always not
Become；
The voltage acquisition module is completed using analog/digital conversion chip, acquires the reference voltage value and measured resistance of output
The voltage value at both ends, and voltage analog is converted into digital quantity, and feed back to kernel control module；
The reference voltage module guarantees for providing the reference voltage of analog/digital conversion chip in voltage acquisition module
The precision and reliability of voltage acquisition module conversion voltage；
The resistivity computing module is utilized by the voltage value at acquisition measured resistance both ends and the output valve of reference voltage
The output valve of reference voltage, and according to IF=UDACThe current value that/R0 calculating current series negative feedback module provides；Further according to Europe
Nurse law RX=UΔ/IF, the resistivity of thermoelectric material is calculated using the voltage difference at measured resistance both ends, resistivity computing module
Data source is the digital signal of voltage acquisition module；
No matter the automatic measurement module executes the operation of manual measurement or automatic measurement by the instruction of judgement input
It is manual measurement or automatic measurement, requires to generate reliable reference voltage and needs by control reference voltage output module
Gear selecting module realizes the switching of sampling resistor；During automatic measurement, the adjusting of reference voltage output module and gear selecting mould
The adjusting of block be it is skimble-scamble, i.e., for the material of similar resistance, the value of reference voltage and sampling resistor is not fixed, the two
There is multiple combinations, and either that is combined, the requirement of resistivity coincidence loss measured by material；
Preferably, the kernel control module uses ATMEGA328P-AU chip, in conjunction with reset circuit, clock electricity
Road and USB turn serial port circuit, and clock circuit is made of crystal oscillator and ceramic condenser, and crystal oscillator is 16MHz without source crystal oscillator；
Preferably, the USB turns serial port circuit using PL2303 chip, PL2303 chip is used without source crystal oscillator
12MHz；
Preferably, described instruction input module is made of serial ports, key and pull-up resistor.
Preferably, the analog/digital conversion chip uses the AD7706 chip of 16 high-speed programmables, wherein AD7706
Operating mode be without buffering, 1 times of gain, self-correcting, sample frequency is 2.4576M and input mode is single ended input；
AD7706 is converted with three road ADC, and the voltage that the first via is converted is benchmark voltage output value, the conversion electricity on the second road and third road
Pressure is the voltage value at measured resistance both ends, and the voltage at measured resistance both ends can be found out by the digital quantity on the second road and third road
Difference.
Preferably, the electric current inverting module is switched using the single pole double throw analog of ISL84684 low on-resistance.
Preferably, the gear selecting module is adopted by analog switch TS5A3166 and the Welwyn high-precision of low on-resistance
Sample resistance composition；The sampling resistor has eight grades, respectively 100 Ω, 1K Ω, 5K Ω, 10K Ω, 51.1K Ω, 100K Ω, 510K
Ω and 1M Ω, the trueness error of sampling resistor are within 0.5%.
Preferably, the reference voltage output module uses 16 high-precision AD8411, in a manner of SPI and core
Control module is connected, and for generating precision voltage reference, approaches the setup parameter of user's input, the precision of reference voltage is
0.01V。
Preferably, the reference voltage module uses high-precision REF5050 chip, the ginseng of a standard 5V is provided
Voltage is examined, guarantees the precision of voltage acquisition module sampled data.
Preferably, the anode of the operational amplifier U1 connects reference voltage, the output of operational amplifier U1 terminates quilt
One end of measuring resistance RX, and the cathode of operational amplifier U1 connects the other end of measured resistance RX and one end of sampling resistor R0, adopts
Sample resistance R0 other end ground connection.
Preferably, the operational amplifier U1 use high-precision of the series electric circuit negative feedback module, Low Drift Temperature
OP07。
Preferably, the display module uses OLED, using I2C is connected with core control circuit.
Compared with the prior art, the invention has the following advantages and beneficial effects:
Small in size, a low-power consumption, safe and stable and high-precision measurement are provided for the measurement of thermoelectric material resistivity
Circuit, may be implemented the resistivity measurement of wide-range, and measurement span can commutate from ohm level to mega-ohms, while through electric current
Control can reduce the influence of Seebeck and peltier effect to thermoelectric material resistivity measurement；In addition, can also be with host computer phase
Even, receive instruction or send data, facilitate data storage, display and calculate, while code has very strong portability.
Detailed description of the invention
Fig. 1 is a kind of system construction drawing of thermoelectric material resistivity measurement circuit.
Fig. 2 is series electric circuit negative feedback module circuit diagram.
Fig. 3 is a kind of way circuit figure of thermoelectric material resistivity measurement circuit.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Embodiment
As shown in Figure 1, thermoelectric material resistivity measurement circuit includes that kernel control module, instruction input module, voltage are adopted
Collect module, electric current inverting module, reference voltage output module, reference voltage module, series electric circuit negative feedback module, gear selecting mould
Block, display module, automatic measurement module and resistivity computing module.
In addition to series electric circuit negative feedback module use+18V power supply, other are adopted the thermoelectric material resistivity measurement circuit
With the power supply of+5V.
The kernel control module has communication function and control function；The communication function includes receiving instruction and data
It sends；The input for receiving instruction and being used for parameter and instruction, and according to the input of parameter and instruction, extract corresponding effective number
According to being ready for next concrete operations；The data send the voltage data for being used to acquire, gear selecting data, benchmark
Voltage data and resistivity calculated value are transmitted to host computer；The control function is for controlling voltage acquisition module, electric current commutation
Module, reference voltage output module, display module, automatic measurement module and gear selecting module.
As shown in Figure 1, described instruction input module is connected using serial ports and key with kernel control module；The voltage is adopted
Collection module is connected by the way of SPI with core control circuit；The electric current inverting module and reference voltage output module, electric current
Series negative feedback module is connected；The reference voltage output module is connected in a manner of SPI with kernel control module；The reference
Voltage module is directly connected with voltage acquisition module；The series electric circuit negative feedback module and electric current inverting module, voltage acquisition
Module, gear selecting module are connected with reference voltage output module；The gear selecting module and series electric circuit negative feedback module and core control
Molding block is connected；The display module is with I2The mode of C is connected with kernel control module；The automatic measurement module and resistivity
Computing module is embedded in kernel control module.
A kind of physical circuit figure of thermoelectric material resistivity measurement circuit of the present embodiment is as shown in Figure 3:
The kernel control module uses ATMEGA328P-AU chip, turns string in conjunction with reset circuit, clock circuit and USB
Mouth circuit, clock circuit are made of crystal oscillator and ceramic condenser, and crystal oscillator is 16MHz without source crystal oscillator.
The USB turns serial port circuit using PL2303 chip, and PL2303 chip uses 12MHz without source crystal oscillator.
Described instruction input module is made of serial ports, key and pull-up resistor.
The analog/digital conversion chip uses the AD7706 chip of 16 high-speed programmables, wherein the operating mode of AD7706
For without buffering, 1 times of gain, self-correcting, sample frequency is 2.4576M and input mode is single ended input；AD7706 has three tunnels
ADC conversion, for the voltage that the first via is converted into benchmark voltage output value, voltage is converted as measured resistance two in the second road and third road
The voltage value at end can find out the voltage difference at measured resistance both ends by the digital quantity on the second road and third road.
The electric current inverting module is switched using the single pole double throw analog of ISL84684 low on-resistance.
The gear selecting module is made of analog switch TS5A3166 and the Welwyn high precision sampling resistance of low on-resistance；
The sampling resistor has eight grades, and respectively 100 Ω, 1K Ω, 5K Ω, 10K Ω, 51.1K Ω, 100K Ω, 510K Ω and 1M Ω are adopted
The trueness error of sample resistance is within 0.5%.
The reference voltage output module use 16 high-precision AD8411, in a manner of SPI with kernel control module phase
Even, for generating precision voltage reference, the setup parameter of user's input is approached, the precision of reference voltage is 0.01V.
The reference voltage module uses high-precision REF5050 chip, provides the reference voltage of a standard 5V, guarantees
The precision of voltage acquisition module sampled data.
As shown in Fig. 2, the series electric circuit negative feedback module includes operational amplifier U1, measured resistance RX and sampling resistor
R0, for providing the current value calculated to measured resistance.
The anode of the operational amplifier U1 connects reference voltage, and the output of operational amplifier U1 terminates the one of measured resistance RX
End, and the cathode of operational amplifier U1 connects the other end of measured resistance RX and one end of sampling resistor R0, sampling resistor R0 is another
End ground connection.
The operational amplifier U1 of the series electric circuit negative feedback module is using high-precision, the OP07 of Low Drift Temperature.
The display module uses OLED, using I2C is connected with core control circuit.
The resistivity computing module is utilized by the voltage value at acquisition measured resistance both ends and the output valve of reference voltage
The output valve of reference voltage, and according to IF=UDACThe current value that/R0 calculating current series negative feedback module provides；Further according to Europe
Nurse law RX=UΔ/IF, the resistivity of thermoelectric material is calculated using the voltage difference at measured resistance both ends, resistivity computing module
Data source is the digital signal of voltage acquisition module.
No matter the automatic measurement module executes the operation of manual measurement or automatic measurement by the instruction of judgement input
It is manual measurement or automatic measurement, requires to generate reliable reference voltage and needs by control reference voltage output module
Gear selecting module realizes the switching of sampling resistor；During automatic measurement, the adjusting of reference voltage output module and gear selecting mould
The adjusting of block be it is skimble-scamble, i.e., for the material of similar resistance, the value of reference voltage and sampling resistor is not fixed, the two
There is multiple combinations, and either that is combined, the requirement of resistivity coincidence loss measured by material.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (10)
1. a kind of thermoelectric material resistivity measurement circuit, which is characterized in that including kernel control module, instruction input module, base
Quasi- voltage output module, gear selecting module, electric current inverting module, series electric circuit negative feedback module, voltage centralized procurement module, reference voltage
Module and display module；The kernel control module includes resistivity computing module and automatic measurement module；Described instruction is defeated
Enter module to be connected using serial ports and key with kernel control module；The voltage acquisition module by the way of SPI with core control
Circuit processed is connected；The electric current inverting module is connected with reference voltage output module, series electric circuit negative feedback module；The benchmark
Voltage output module is connected in a manner of SPI with kernel control module；The reference voltage module is directly and voltage acquisition module
It is connected；The series electric circuit negative feedback module and electric current inverting module, voltage acquisition module, gear selecting module and reference voltage export
Module is connected；The gear selecting module is connected with series electric circuit negative feedback module and kernel control module；The display module is with I2C
Mode be connected with kernel control module；The automatic measurement module and resistivity computing module are embedded in kernel control module；
The kernel control module has communication function and control function；The communication function includes receiving instruction and data hair
It send；The input for receiving instruction and being used for parameter and instruction, and according to the input of parameter and instruction, extract corresponding effective number
Value finds out the operation for needing to complete in next step then according to instruction search operation list；What the data transmission was used to acquire
Voltage data, gear selecting data, reference voltage data and resistivity calculated value are transmitted to host computer in the form of serial ports；The control
Function is for controlling voltage acquisition module, electric current inverting module, reference voltage output module, display module, automatic measurement module
With gear selecting module, so that system is executed task by operation order, keep the high efficiency and stability of system；
Described instruction input module is connected using serial ports and key with kernel control module, realizes human-computer interaction function；
The reference voltage output module is used for outputting reference voltage value, and approaches the reference voltage value of setting input, by benchmark
Voltage value is exported into series electric circuit negative feedback module, the reference voltage as operational amplifier positive input terminal；
Sampling resistor during resistivity measurement automatically selecting or manually selecting for circuit for the gear selecting module, needs low
The digital switch of conducting resistance completes operation, and excess loss caused by reducing because of conducting resistance improves measurement accuracy；
Whether the electric current inverting module meets electric current commutating period for decision circuitry, if meeting the requirements, change flow through by
The current direction of measuring resistance；If not meeting, primary current direction is kept；In addition, change current direction frequency be it is controllable, can
Change frequency by instruction input；
The series electric circuit negative feedback module includes the positive input of operational amplifier U1, measured resistance RX and sampling resistor R0, U1
The voltage output of reference voltage output module is terminated, the output of U1 terminates wherein one end of measured resistance RX, measured resistance RX's
The other end is connected with the negative input end of one end of sampling resistor R0 and operational amplifier U1 simultaneously, and sampling resistor R0's is another
One end ground connection；Series electric circuit negative feedback module is used to provide the constant current value calculated to measured resistance, and constant process is the stage
Property, and it is non-constant constant always；
The voltage acquisition module is completed using analog/digital conversion chip, acquires reference voltage value and the measured resistance both ends of output
Voltage value, and voltage analog is converted into digital quantity, and feed back to kernel control module；
The reference voltage module guarantees voltage for providing the reference voltage of analog/digital conversion chip in voltage acquisition module
The precision and reliability of acquisition module conversion voltage；
The resistivity computing module utilizes benchmark by the voltage value at acquisition measured resistance both ends and the output valve of reference voltage
The output valve of voltage, and according to IF=UDACThe current value that/R0 calculating current series negative feedback module provides；It is fixed further according to ohm
Restrain RX=UΔ/IF, the resistivity of thermoelectric material, the data of resistivity computing module are calculated using the voltage difference at measured resistance both ends
Source is the digital signal of voltage acquisition module；
The automatic measurement module executes the operation of manual measurement or automatic measurement, either hand by the instruction of judgement input
Dynamic measurement or automatic measurement require to generate reliable reference voltage by control reference voltage output module and need gear selecting
Module realizes the switching of sampling resistor；During automatic measurement, adjusting and the gear selecting module of reference voltage output module
Adjusting be it is skimble-scamble, i.e., for the material of similar resistance, the value of reference voltage and sampling resistor be not it is fixed, the two exists
Multiple combinations, either that combine, the requirement of resistivity coincidence loss measured by material.
2. a kind of thermoelectric material resistivity measurement circuit according to claim 1, which is characterized in that the core controls mould
Block uses ATMEGA328P-AU chip, turns serial port circuit in conjunction with reset circuit, clock circuit and USB, clock circuit by crystal oscillator and
Ceramic condenser composition, crystal oscillator are 16MHz without source crystal oscillator；The USB turns serial port circuit using PL2303 chip, PL2303 chip
Without source crystal oscillator use 12MHz；Described instruction input module is made of serial ports, key and pull-up resistor.
3. a kind of thermoelectric material resistivity measurement circuit according to claim 1, which is characterized in that the analog/digital conversion
Chip uses the AD7706 chip of 16 high-speed programmables, and wherein the operating mode of AD7706 is without buffering, 1 times of gain, self-correcting
Just, sample frequency is 2.4576M and input mode is single ended input；AD7706 is converted with three road ADC, the electricity of first via conversion
Pressure is benchmark voltage output value, and the second road and third road convert voltage as the voltage value at measured resistance both ends, pass through the second tunnel
The voltage difference at measured resistance both ends can be found out with the digital quantity on third road.
4. a kind of thermoelectric material resistivity measurement circuit according to claim 1, which is characterized in that the electric current commutation mould
Block is switched using the single pole double throw analog of ISL84684 low on-resistance.
5. a kind of thermoelectric material resistivity measurement circuit according to claim 1, which is characterized in that the gear selecting module by
Analog switch TS5A3166 and the Welwyn high precision sampling resistance of low on-resistance forms；The sampling resistor has eight grades, point
Not Wei 100 Ω, 1K Ω, 5K Ω, 10K Ω, 51.1K Ω, 100K Ω, 510K Ω and 1M Ω, the trueness error of sampling resistor is
Within 0.5%.
6. a kind of thermoelectric material resistivity measurement circuit according to claim 1, it is characterised in that: the reference voltage is defeated
Module uses 16 high-precision AD8411 out, is connected in a manner of SPI with kernel control module, for generating high precision reference electricity
Pressure, approaches the setup parameter of user's input, and the precision of reference voltage is 0.01V.
7. a kind of thermoelectric material resistivity measurement circuit according to claim 1, which is characterized in that the reference voltage mould
Block uses high-precision REF5050 chip, provides the reference voltage of a standard 5V, guarantees voltage acquisition module sampled data
Precision.
8. a kind of thermoelectric material resistivity measurement circuit according to claim 1, which is characterized in that the operational amplifier
The anode of U1 connects reference voltage, one end of the output termination measured resistance RX of operational amplifier U1, and operational amplifier U1's is negative
Pole connects the other end of measured resistance RX and one end of sampling resistor R0, sampling resistor R0 other end ground connection.
9. a kind of thermoelectric material resistivity measurement circuit according to claim 8, which is characterized in that the current-series are negative
The operational amplifier U1 of feedback module is using high-precision, the OP07 of Low Drift Temperature.
10. a kind of thermoelectric material resistivity measurement circuit according to claim 1, which is characterized in that the display module
Using OLED, using I2C is connected with core control circuit.
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| CN201510833853.8A CN105486928B (en) | 2015-11-25 | 2015-11-25 | A kind of thermoelectric material resistivity measurement circuit |
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| CN201510833853.8A CN105486928B (en) | 2015-11-25 | 2015-11-25 | A kind of thermoelectric material resistivity measurement circuit |
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| CN105486928B true CN105486928B (en) | 2019-02-15 |
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| CN111965510A (en) * | 2020-07-01 | 2020-11-20 | 中国科学院上海硅酸盐研究所 | Method and system for testing intrinsic photoconductivity of high-resistivity wide-bandgap semiconductor material |
| CN113466686A (en) * | 2021-07-01 | 2021-10-01 | 西安铁路信号有限责任公司 | Programmable power supply and method for testing electrical characteristics of railway safety relay |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08278335A (en) * | 1995-04-10 | 1996-10-22 | Kokusai Electric Co Ltd | Measuring device of resistivity |
| CN102253287A (en) * | 2011-05-27 | 2011-11-23 | 青岛大学 | LABview-based method for measuring temperature-resistivity |
| CN103245837A (en) * | 2013-05-16 | 2013-08-14 | 优利德科技(中国)有限公司 | Insulation resistance measurement method supporting output volage of any point and measurement device |
| CN204347137U (en) * | 2014-11-05 | 2015-05-20 | 贝兹维仪器(苏州)有限公司 | Combined resistance rate measuring system |
-
2015
- 2015-11-25 CN CN201510833853.8A patent/CN105486928B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08278335A (en) * | 1995-04-10 | 1996-10-22 | Kokusai Electric Co Ltd | Measuring device of resistivity |
| CN102253287A (en) * | 2011-05-27 | 2011-11-23 | 青岛大学 | LABview-based method for measuring temperature-resistivity |
| CN103245837A (en) * | 2013-05-16 | 2013-08-14 | 优利德科技(中国)有限公司 | Insulation resistance measurement method supporting output volage of any point and measurement device |
| CN204347137U (en) * | 2014-11-05 | 2015-05-20 | 贝兹维仪器(苏州)有限公司 | Combined resistance rate measuring system |
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