CN109212397A - A kind of equipment that test persistently uses ability - Google Patents
A kind of equipment that test persistently uses ability Download PDFInfo
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- CN109212397A CN109212397A CN201710510798.8A CN201710510798A CN109212397A CN 109212397 A CN109212397 A CN 109212397A CN 201710510798 A CN201710510798 A CN 201710510798A CN 109212397 A CN109212397 A CN 109212397A
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- 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
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2607—Circuits therefor
- G01R31/2632—Circuits therefor for testing diodes
- G01R31/2635—Testing light-emitting diodes, laser diodes or photodiodes
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Abstract
The invention discloses the equipment that a kind of test persistently uses ability, including microprocessor, display and cue circuit, parameter setting circuit, data storage circuitry, time base circuit, temperature measuring circuit, communication interface circuit, numerical control voltage follower circuit, digital-control constant-flow source circuit and measuring circuit.Numerical control voltage follower circuit provides voltage to measured diode, and digital-control constant-flow source circuit provides constant-current source to measured diode；Measuring circuit is connect to measure the voltage of measured diode and luminous intensity with measured diode.The present invention not only provides adjustable voltage, the constant current output characteristic in the case where setting voltage is also provided simultaneously, voltage value and constant current value are arranged by external keyboard, and measure and adjust by detection circuit, stable test voltage and electric current are provided, the accuracy of measurement is improved.In addition the environment temperature that the present invention can measure sample can use temperature and be corrected to brightness measurement result in this way in the case where requiring high-acruracy survey.
Description
Technical field
The invention belongs to organic electroluminescent LED detection fields, are related to a kind of detector, and especially one kind is to organic
The detector of electroluminescent diode progress life tests.
Background technique
OLED display device is a kind of fast response time, the luminescent device without visual angle, but it is also a kind of organic matter simultaneously,
The problems such as there is aging and service lifes, therefore service life becomes the key factor for restricting OLED.In OLED display device
Development process in, the measurement to its service life be characterize device performance important indicator.Currently, being used for the instrument of OLED lifetime measurement
Device type is seldom, and the operation that laboratory, factory use also is inconvenient, and there are no a kind of function ratios more completely to organic electroluminescence
The device that the service life of luminescent device is tested automatically.The seldom OLED lifetime measurement instrument of type in the prior art, can be right
Tested metering device provides measurement voltage, or can only provide fixed constant current output.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, a kind of lasting setting using ability of test is provided
Standby, which can require according to the difference of test, the voltage for being applied to measured device both ends can be adjusted, and can be in spy
Adjustable constant current output is provided under constant voltage, and the detector can also measure environment temperature, can satisfy and be suitable for not
With the measurement request of device.
The present invention solves by the following technical programs:
It is this test persistently use ability equipment, including microprocessor, display and cue circuit, parameter setting circuit,
Data storage circuitry, time base circuit, temperature measuring circuit, communication interface circuit, numerical control voltage follower circuit, digital-control constant-flow source electricity
Road and measuring circuit, the microprocessor respectively with display with cue circuit, parameter setting circuit, data storage circuitry, Shi Ji
Circuit, temperature measuring circuit are connected with communication interface circuit, the numerical control voltage follower circuit and numerical control constant-current source circuit difference
It is connect by D/A conversion circuit with microprocessor, the measuring circuit is connect by A/D conversion circuit with microprocessor, described
Digital-control constant-flow source circuit is also connect with measuring circuit；The numerical control voltage follower circuit provides voltage, numerical control to measured diode
Constant-current source circuit provides constant-current source to measured diode；The measuring circuit is connect to measure measured diode with measured diode
Voltage and luminous intensity.
Above-mentioned microprocessor is LM3S1138.
Further, the data storage in LM3S1138 described above is as data storage circuitry；In LM3S1138
Included internal temperature sensor is as temperature measuring circuit.
Above-mentioned display and cue circuit include LCD liquid crystal display and red light emitting diodes；The LCE liquid crystal display
Model LM12864.
Above-mentioned numerical control voltage follower circuit includes the first digital analog converter, the first to six resistance, the first and second operation amplifier
Device, second and third electrolytic capacitor and the first triode；First digital analog converter is DAC7513, the end Vd is connected to second simultaneously,
One end of three electrolytic capacitors, output end vo ut are connected to the first, fourth resistance in succession, and the other end of the 4th resistance is grounded, and first
The non-inverting input terminal of the first operational amplifier of another termination of resistance, the 5th electricity of inverting input terminal connection of the first operational amplifier
It is grounded after resistance, the inverting input terminal while the output end phase through the 6th resistance with the first operational amplifier of the first operational amplifier
Even, the non-inverting input terminal of the output end of the first operational amplifier through second resistance access second operational amplifier, supply voltage from
The collector of first triode inputs, by connecing second operational amplifier through 3rd resistor after the emitter output of the first triode
Inverting input terminal, the base stage of output the first triode of termination of second operational amplifier.
Above-mentioned digital-control constant-flow source circuit includes the second digital analog converter, the seven, the nine, ten resistance, third operational amplifier, the
Four, five electrolytic capacitors and the second triode；Second digital analog converter is DAC7513, fourth, fifth electrolysis electricity of Vd termination
Hold, the output end vo ut of the second digital analog converter connects the tenth resistance, and the other end of the tenth resistance is grounded, the second digital analog converter
Output end vo ut is also connected with the non-inverting input terminal of third operational amplifier, the inverting input terminal connection second of third operational amplifier
Through the 9th resistance eutral grounding after the source electrode of triode, the output end of third operational amplifier accesses the second triode through the 7th resistance
The drain electrode of grid, the second triode connects tested OLED element；Second diode is IRLZ24N.
Tested OLED element is connected in above-mentioned measuring circuit, the measuring circuit includes photocell, the eight, the 11, ten
Three resistance, fourth, fifth, six operational amplifiers, the six, the seven capacitors and variable rheostat, the photocell are placed in measured diode
Near, photronic one end ground connection, the other end is connected to the inverting input terminal of the 6th operational amplifier, the 6th operational amplifier
Non-inverting input terminal ground connection connects thirteenth resistor and the 7th electricity respectively between the inverting input terminal and output end of the 6th operational amplifier
To hold, the output end connection twelfth resistor of the 6th operational amplifier is followed by the inverting input terminal to the 5th operational amplifier,
The non-inverting input terminal of five, the six operational amplifiers is grounded, and is divided between the inverting input terminal and output end of the 5th operational amplifier
Not Lian Jie the 6th capacitor and variable resistance, the variable resistance is also in series with eleventh resistor, the output of the 5th operational amplifier
Terminate microprocessor；One end of the tested OLED element is grounded after connecting power supply and first capacitor, and the other end passes through the 8th resistance
The non-inverting input terminal of four-operational amplifier is connect, the inverting input terminal of four-operational amplifier is connected with output end to be followed by locating in a subtle way
Manage the end ADC0 of device.
Further, the first and second operational amplifier, third operational amplifier, fourth, fifth, six operational amplifiers described above
It is LM324.
The invention has the following advantages:
Circuit of the invention provides not only adjustable voltage, while also providing the spy of the constant current output in the case where setting voltage
Property, voltage value and constant current value are arranged by external keyboard, and measure and adjust by detection circuit, provide stable survey
Voltage and current is tried, the accuracy of measurement is improved.In addition the present invention can measure the environment temperature of sample, want in this way
In the case where seeking high-acruracy survey, it can use temperature and brightness measurement result be corrected.
Detailed description of the invention
Fig. 1 is the principle of the present invention block diagram；
Fig. 2 is that the present invention relates to the circuit diagrams of numerical control voltage follower circuit 1, digital-control constant-flow source circuit 2 and measuring circuit 3；
Fig. 3 is display of the invention and cue circuit；
Fig. 4 is parameter setting circuit of the invention.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
Fig. 1 is test of the invention persistently using each section connection block diagram of the equipment of ability, as shown in the figure: the detection
Instrument includes microprocessor, display and cue circuit, parameter setting circuit, data storage circuitry, time base circuit, temperature measurement electricity
Road, communication interface circuit, numerical control voltage follower circuit 1, digital-control constant-flow source circuit 2 and measuring circuit 3.Wherein microprocessor is distinguished
With display and cue circuit, parameter setting circuit, data storage circuitry, time base circuit, temperature measuring circuit and communication interface electricity
Road connection.Numerical control voltage follower circuit 1 and numerical control constant-current source circuit 2 are connect by D/A conversion circuit with microprocessor respectively.It surveys
Amount circuit 3 is connect by A/D conversion circuit with microprocessor, and digital-control constant-flow source circuit 2 is also connect with measuring circuit 3.
Microprocessor of the invention is calculated for data acquisition, data, signal controls, signal transmission, temperature measurement, digital-to-analogue
The functions such as conversion.Numerical control voltage follower circuit 1 provides voltage to measured diode, and digital-control constant-flow source circuit 2 is to measured diode
Constant-current source is provided.Measuring circuit 3 is connect to measure the voltage of measured diode and luminous intensity with measured diode.Data storage
Circuit is used to carry out measured data temporary storage, then is transmitted to host computer by communication interface circuit.Of the invention
Temperature measuring circuit major function is the environment temperature for measuring 0 DEG C~100 DEG C.Communication interface circuit be mainly used for microprocessor to
PC machine transmits measurement data, is realized by MAX485 interface.
It is done further in detail below in conjunction with connection relationship of the Fig. 2 to the three parts circuit with innovation in Fig. 1 present invention
Thin description:
Numerical control voltage follower circuit 1:
Numerical control voltage follower circuit 1 is put including the first digital analog converter U1, the first to six resistance R1-R6, the first and second operation
Big device U2A, U2B, second and third electrolytic capacitor C2, C3 and the first triode Q1；First digital analog converter U1 is DAC7513, Vd
End while the one end for being connected to second and third electrolytic capacitor C2, C3, output end vo ut are connected to first, fourth resistance R1, R4, institute in succession
The other end for stating the 4th resistance R4 is grounded, the non-inverting input terminal of the first operational amplifier of another termination U2A of first resistor R1, the
The inverting input terminal of one operational amplifier U2A is grounded after connecting the 5th resistance R5, the inverting input terminal of the first operational amplifier U2A
It is connected simultaneously through the 6th resistance R6 with the output end of the first operational amplifier U2A, the output end of the first operational amplifier U2A is through the
Two resistance R2 access the non-inverting input terminal of second operational amplifier U2B, and supply voltage is inputted from the collector of the first triode Q1,
By connecing through 3rd resistor R3 the inverting input terminal of second operational amplifier U2B after the emitter output of the first triode Q1, second
The base stage of the first triode Q1 of output termination of operational amplifier U2B.The circuit is for providing the adjustable voltage of numerical control.By setting
Fixed required voltage, is exported in the form of digital quantity through microprocessor, is converted to analog voltage value by D/A, and the output voltage is logical
The in-phase end that U2A amplifying circuit is input to U2B is crossed, since the reverse side of amplifier U2B is identical as in-phase end voltage, Q1's
The voltage of emitter-base bandgap grading output is given voltage.
Digital-control constant-flow source circuit 2:
Digital-control constant-flow source circuit 2 includes the second digital analog converter U4, the seven, the nine, ten resistance R7, R9, R10, third operation
Amplifier U2C, fourth, fifth electrolytic capacitor C4, C5 and the second triode Q2.Second digital analog converter U4 is DAC7513, the end Vd
Fourth, fifth electrolytic capacitor C4, C5 is met, the output end vo ut of the second digital analog converter U4 meets the tenth resistance R10, the tenth resistance R10
Other end ground connection, the output end vo ut of the second digital analog converter U4 is also connected with the non-inverting input terminal of third operational amplifier U2C,
It is grounded after the source electrode of the second triode Q2 of inverting input terminal connection of third operational amplifier U2C through the 9th resistance R9, third fortune
The output end for calculating amplifier U2C accesses the grid of the second triode Q2, the drain electrode connection of the second triode Q2 through the 7th resistance R7
Connect tested OLED element；The second diode Q2 is IRLZ24N.The circuit is lighted tested for providing the constant-current source of numerical control
The luminescent device of amount.By the electric current needed for setting, is exported in the form of digital quantity through microprocessor, analog quantity is converted to by D/A
Voltage value, voltage input U2C in-phase end, since reverse side is equal with in-phase end voltage, the electric current actually entered is reverse phase
The electric current is supplied to tested OLED by Q2 drain electrode output, is equivalent on tested OLED by the ratio for holding output voltage and R9
The constant-current source of given numerical value is added.
Measuring circuit 3:
Tested OLED element is connected in measuring circuit 3, measuring circuit 3 includes photocell, the eight, the 11,13 resistance
R8, R11, R13, fourth, fifth, six operational amplifier U2D, U3A, U3B, the six, the seven capacitor C6, C7, first capacitor C1 and variable
Rheostat W, the photocell are placed near measured diode, and photronic one end ground connection, the other end is connected to the 6th operation and puts
The inverting input terminal of big device U3B, the non-inverting input terminal ground connection of the 6th operational amplifier U3B, the reverse phase of the 6th operational amplifier U3B
Thirteenth resistor R13 and the 7th capacitor C7, the output of the 6th operational amplifier U3B are connect between input terminal and output end respectively
End connection twelfth resistor R12 is followed by the inverting input terminal to the 5th operational amplifier U3A, the five, the six operational amplifier U3A,
The non-inverting input terminal of U3B is grounded, and the 6th electricity is separately connected between the inverting input terminal and output end of the 5th operational amplifier U3A
Hold C6 and variable resistance W, the variable resistance W are also in series with eleventh resistor R11, the output end of the 5th operational amplifier U3A
Connect microprocessor；One end of the tested OLED element is grounded after connecting power supply and first capacitor C1, and the other end passes through the 8th resistance
R8 connects the non-inverting input terminal of four-operational amplifier U2D, after the inverting input terminal of four-operational amplifier U2D is connected with output end
Access the end ADC0 of microprocessor.The circuit includes optical measurement circuit and voltage measurement feed circuit two parts.Optical measurement circuit
For measuring photronic electric current, due to photronic output electric current very little, also needed in circuit to faint current signal into
Row amplification is converted using the A/D converter of 10 bit resolutions in microprocessor LM3S1138, the digital signal after conversion is sent
Enter into microprocessor and carry out operation, judges whether photocurrent values in photocell have decayed to the half of original value.Voltage measurement
Feed circuit is setting the sum of voltage and feedback voltage for adjusting the output voltage being added on tested OLED, virtual voltage, from
And improve the accuracy of measurement.
Display and cue circuit:
Display and cue circuit of the invention is as shown in figure 3, the circuit includes two pole of LCD liquid crystal display and emitting red light
Pipe；The model LM12864 of the LCD liquid crystal display.CS, SLD, SCLK pin of LM12864 is respectively with LM3S1138's
The connection of PO.1, PO.2, PO.3 pin；The NC pin energization resistance R1 of LM12864 is connected to VCC；The VDD pin of LM12864 is direct
It is connected on VCC, the VSS pin ground connection of LM12864.The liquid crystal display is with Hanzi font library and serial mode progress can be used
Data transmission can show five-element's Chinese character, the voltage value of the first row display setting, the current value of the second row display setting, third
Row display testing time, fourth line show Current Temperatures, and (half-life period is that then, display is not empty for the value of fifth line display half-life period
It is white).
The positive terminal of red light emitting diodes is connected on VCC by resistance R2, and negative pole end is connected to LM3S1138's
PO.0 pin.The alternating light on and off of red light emitting diodes prompt tester, indicate whether measurement terminates.
Parameter setting circuit:
Referring to fig. 4, parameter setting circuit includes five on & off switch S1, S2, S3, S4, S5, and the one of this S1, S2, S3, S4, S5
End passes through five resistance R1, R2 respectively, R3, R4, R5, is connected on VCC, and the other end of five on & off switches is grounded.As schemed
Show, which also passes through the INTO pin that 74HC30 and 74HC132 is connected to LM3S1138, and in addition five on & off switches are also
It is connected respectively on P1.0, P1.1, P1.2, P1.3, P1.4 pin of LM3S1138.Wherein the function of five on & off switches is as follows:
S1 is " setting/confirmation " key, and S2 is " parameter selection " key, and S3 is " displacement " key, and S4 is " adding 1 " key,
S5 is " subtracting 1 " key.When pressing S1 key for the first time, cursor flashes at the high-value for the voltage/current for needing to set, into setting
Set state；Selection is switched at this point, being arranged in two with S2 key in voltage and current；Voltage is set with S3, S4, S5 key input
With the value of setting electric current, when setting the value of which numerical digit, cursor just flashes in which numerical digit；S1 key, light are pressed again
Mark disappears, and setting state is exited, into test job state.
In more excellent scheme of the invention, above-mentioned first and second operational amplifier U2A, U2B, third operational amplifier
U2C, fourth, fifth, six operational amplifier U2D, U3A, U3B select LM324.Microprocessor selects LM3S1138, wherein will
For data storage in LM3S1138 as data storage circuitry, it is 64K that wherein SRAM capacity, which is 16K, Flash capacity,.It will
The internal temperature sensor carried in LM3S1138 is as temperature measuring circuit.Base chip when time base circuit of the invention uses
DS1302 trickle charge clock keeps chip, generates accurately pulse per second (PPS) time signal, microprocessor LM3S1138 is to pulse per second (PPS)
Signal is counted, to improve the measurement accuracy to the time.It can also be counted using the internal timing function in LM3S1138
When.The internal temperature sensor that temperature measuring circuit of the invention uses LM3S1138 to carry, can survey range is -55 DEG C~125
DEG C, there is good linear and precision.
Detection process and working principle of the invention is as follows:
Tested organic electroluminescent LED is placed in the closed measurement container of a light, in measured diode two
Rectify to given voltage is applied, constant current driving is provided, provided constant current value can be set in advance；Wavelength is housed in measurement container
Range is the photocell of 380nm~800nm, for measuring the light emission luminance of tested organic electroluminescent LED；In a reservoir
It is also equipped with sensor for measuring temperature, the environment temperature in measurement container can be measured；All lines in measurement container pass through line
Terminal realizes the connection with externally measured instrument；Measuring instrument passes through communication connection to computer again, realizes the reality of measurement data
When upload function.
Since the service life of measurement organic electroluminescence device can be realized by measuring its half-life period, it is therefore desirable to which measurement is tested
The starting brightness and initial time t of luminescent device0, also need to measure tested luminescent device brightness decay to 1/2 starting brightness when institute
Time t1, half-life period TBExpression formula are as follows:
TB=t1-t0
Compared under steady temperature, photocell exports electric current I and to be irradiated to photronic luminous intensity B linear.If by
Surveying under luminescent device starting brightness and being irradiated to photronic luminous intensity is B0(can use instrumental calibration), it is I that photocell, which exports electric current,0；
It is Bi that any moment, which is tested luminescent device and is irradiated to photronic luminous intensity, and it is Ii that photocell, which exports electric current,.Then have:
Any time, photronic luminous intensity can be approximately:
WhenWhen (tested luminescent device brightness decay half),
Above-mentioned formula shows: tested luminescent device brightness decay half, photocell electric current I0Decay half.Therefore, it only needs
Photocell is measured by initial value electric current I0The time used when half is decayed to, the half-life period of tested metering device has just been obtained.
Temperature correction principle: thermistor method, the feedback resistance using thermistor as current-voltage converter are used
A part.When environment temperature increases, photocell exports electric current and increases, and feedback resistance uses the MF series of heat of negative temperature coefficient
Quick resistance, temperature increase, thus feedback resistance declines, and output voltage is made to maintain to stablize.
The voltage and current for needing to apply when can need to set test according to test, meets different organic electroluminescents two
The test request of pole pipe；The half-life period of automatically testing measured device can automatically save test result；Measured data can be uploaded to
PC machine is analyzed for data；It can be separated with PC machine, it is independent to use；Feature operation is convenient and simple；Cost is relatively low, and structure is simple.
Apply given test voltage value at tested luminescent device both ends, while the test current value of setting being also provided, and
Start clocking capability.Luminescent device shines under the driving of constant voltage and electric current, and with the continuity of time, luminous intensity can be by
It is decrescence weak.The luminous intensity that tested luminescent device is measured using photocell, when the brightness measured is shown to be the 1/2 of primary brightness
When being worth (brightness decay half), stop timing, timing time at this time is the half-life period of measured device, i.e., sends out as measured device
The index parameter in light service life.
In conclusion the circuit of present patent application invention provides not only adjustable voltage, while also providing and setting
Voltage value and constant current value is arranged by external keyboard in constant current output characteristic under voltage, and by detection circuit measure with
Adjustment, provides stable test voltage and electric current, improves the accuracy of measurement.In addition temperature is also to influence brightness measurement knot
An important parameter for fruit, so, the present invention can measure the environment temperature of sample, require high-acruracy survey in this way
In the case of, it can use temperature and brightness measurement result be corrected.
Claims (2)
1. the equipment that a kind of test persistently uses ability, including microprocessor, display and cue circuit, parameter setting circuit, number
According to storage circuit, time base circuit, temperature measuring circuit and communication interface circuit, it is characterised in that: further include having numerical control voltage defeated
Circuit (1), digital-control constant-flow source circuit (2) and measuring circuit (3) out, the microprocessor respectively with display with cue circuit, ginseng
Number setting circuit, data storage circuitry, time base circuit, temperature measuring circuit are connected with communication interface circuit, the numerical control voltage
Output circuit (1) and numerical control constant-current source circuit (2) are connect by D/A conversion circuit with microprocessor respectively, the measuring circuit
(3) it is connect by A/D conversion circuit with microprocessor, the digital-control constant-flow source circuit (2) also connect with measuring circuit (3)；Institute
It states numerical control voltage follower circuit (1) and provides voltage to measured diode, digital-control constant-flow source circuit (2) provides permanent to measured diode
Stream source；The measuring circuit (3) is connect to measure the voltage of measured diode and luminous intensity with measured diode；The display
It include LCD liquid crystal display and red light emitting diodes with cue circuit；The model LM12864 of the LCE liquid crystal display；
The numerical control voltage follower circuit (1) includes the first digital analog converter (U1), the first to six resistance (R1-R6), the first and second operation
Amplifier (U2A, U2B), second and third electrolytic capacitor (C2, C3) and the first triode (Q1)；First digital analog converter (U1) is
The end DAC7513, Vd is connected to one end of second and third electrolytic capacitor (C2, C3) simultaneously, output end vo ut is connected to first in succession,
Four resistance (R1, R4), the other end ground connection of the 4th resistance (R4), the first operation amplifier of another termination of first resistor (R1)
The non-inverting input terminal of device (U2A), the inverting input terminal of the first operational amplifier (U2A) connect the 5th resistance (R5) and are grounded afterwards, the
The inverting input terminal of one operational amplifier (U2A) output end through the 6th resistance (R6) and the first operational amplifier (U2A) simultaneously
It is connected, the output end of the first operational amplifier (U2A) is through the same mutually defeated of second resistance (R2) access second operational amplifier (U2B)
Enter end, supply voltage is inputted from the collector of the first triode (Q1), by after the emitter output of the first triode (Q1) through the
Three resistance (R3) connect the inverting input terminal of second operational amplifier (U2B), the output termination first of second operational amplifier (U2B)
The base stage of triode (Q1).
2. the equipment that test according to claim 1 persistently uses ability, it is characterised in that: the digital-control constant-flow source circuit
(2) include the second digital analog converter (U4), the seven, the nine, ten resistance (R7, R9, R10), third operational amplifier (U2C), the 4th,
Five electrolytic capacitors (C4, C5) and the second triode (Q2)；Second digital analog converter (U4) is DAC7513, Vd termination the
Four, five electrolytic capacitors (C4, C5), the output end vo ut of the second digital analog converter (U4) connect the tenth resistance (R10), the tenth resistance
(R10) other end ground connection, the output end vo ut of the second digital analog converter (U4) are also connected with the same of third operational amplifier (U2C)
Phase input terminal, third operational amplifier (U2C) inverting input terminal connection the second triode (Q2) source electrode after through the 9th resistance
(R9) it being grounded, the output end of third operational amplifier (U2C) accesses the grid of the second triode (Q2) through the 7th resistance (R7), the
The drain electrode of two triodes (Q2) connects tested OLED element；Second diode (Q2) is IRLZ24N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710510798.8A CN109212397A (en) | 2017-06-29 | 2017-06-29 | A kind of equipment that test persistently uses ability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710510798.8A CN109212397A (en) | 2017-06-29 | 2017-06-29 | A kind of equipment that test persistently uses ability |
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| Publication Number | Publication Date |
|---|---|
| CN109212397A true CN109212397A (en) | 2019-01-15 |
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| CN201710510798.8A Pending CN109212397A (en) | 2017-06-29 | 2017-06-29 | A kind of equipment that test persistently uses ability |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358920A (en) * | 2021-05-17 | 2021-09-07 | 优利德科技(中国)股份有限公司 | Voltage drop measuring device and voltage drop measuring method |
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2017
- 2017-06-29 CN CN201710510798.8A patent/CN109212397A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113358920A (en) * | 2021-05-17 | 2021-09-07 | 优利德科技(中国)股份有限公司 | Voltage drop measuring device and voltage drop measuring method |
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| WD01 | Invention patent application deemed withdrawn after publication |