KR20160137784A - Testing device and testing method of pico amphere meter - Google Patents

Testing device and testing method of pico amphere meter Download PDF

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Publication number
KR20160137784A
KR20160137784A KR1020150071084A KR20150071084A KR20160137784A KR 20160137784 A KR20160137784 A KR 20160137784A KR 1020150071084 A KR1020150071084 A KR 1020150071084A KR 20150071084 A KR20150071084 A KR 20150071084A KR 20160137784 A KR20160137784 A KR 20160137784A
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KR
South Korea
Prior art keywords
picoamperes
evaluation
channel
control signal
power source
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KR1020150071084A
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Korean (ko)
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KR101691639B1 (en
Inventor
임홍우
윤양기
형재필
이창훈
이영주
정의효
이민혁
한우석
Original Assignee
재단법인 한국기계전기전자시험연구원
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Priority to KR1020150071084A priority Critical patent/KR101691639B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
    • 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

Abstract

According to the present invention, disclosed are a device and a method to evaluate reliability of a pico-ammeter, which is a precise current measure instrument, capable of evaluating a plurality of pico-ammeter at once by one reliability test. The device comprises: a power source unit to output a constant current according to an applied power control signal; a multi-channel multiplexer to divide and transfer the constant current outputted from the power source unit to a plurality of pico-ammeters, which are an object to be tested, according to an applied channel control signal; the pico-ammeters connected to channels of the multi-channel multiplexer, respectively; and an integrated control unit to provide a power signal applied from the power source unit, provide the channel control signal of the multi-channel multiplexer, and receive and store a measurement value of the pico-ammeters.

Description

TECHNICAL FIELD [0001] The present invention relates to a picoampere meter reliability evaluation apparatus and a testing method,

The present invention relates to an evaluation apparatus and an evaluation method for evaluating the reliability of a picoampermet, which is a precision current measuring apparatus.

Pico Amps is a precision instrument that can measure current in pico amps.

Such a precision measuring instrument is used for testing and evaluating various other devices, and its reliability is very important.

The conventional reliability evaluation apparatus is configured to evaluate the reliability of one measuring instrument at a time, so that it takes a long time to perform the reliability evaluation test, and environmental variables at the time of reliability evaluation may act so that an evaluation apparatus and an evaluation method .

An object of the present invention is to provide a picoamperes reliability evaluation apparatus and a method of evaluating a plurality of picoamperes in a single reliability evaluation test using a plurality of picoampere meters to be evaluated.

It is another object of the present invention to provide a picoamperes reliability evaluation apparatus and a method of evaluating a plurality of picoampere meters which can simultaneously evaluate measurement errors or defects of individual picoammeters.

The present invention relates to a power supply unit for outputting a constant current according to an applied power supply control signal. A multi-channel multiplexer for dividing the output constant current of the power source unit into a plurality of picoamperes as a device under test according to an applied channel control signal; A plurality of picoamperes connected to respective channels of the multi-channel multiplexer; And an integrated controller for providing a power supply signal applied to the power source unit and providing a channel control signal of the multi-channel multiplexer and receiving and storing measurement result values of the plurality of picoamperes, Thereby providing an evaluation apparatus.

A temperature sensor for measuring a temperature inside the environmental chamber; a humidity sensor for detecting a humidity inside the environment chamber; and a control unit for controlling the temperature of the environment chamber, And may further include a humidity sensor for measuring the humidity.

Preferably, the air conditioning means is controlled by an environmental signal of the integrated control unit, and the measured values of the temperature sensor and the humidity sensor are transmitted to the integrated control unit.

The multi-channel multiplexer preferably connects the power source unit and one of the plurality of picoameters in a time-division manner.

The integrated controller may apply a channel control signal to the multi-channel multiplexer according to measured values of the temperature sensor and the humidity sensor.

According to another aspect of the present invention, there is provided a power supply control apparatus including a power source unit for outputting a constant current according to an applied power control signal, and a plurality of picoamperes, A plurality of picoamplifiers connected to respective channels of the multi-channel multiplexer; an environment chamber accommodating the plurality of devices to be measured; and a controller for controlling temperature and humidity inside the environment chamber, A temperature sensor for measuring a temperature inside the environmental chamber, a humidity sensor for measuring humidity inside the environmental chamber, and a power supply signal applied to the power source unit, A control means for controlling the air conditioning means, receiving the measured values of the temperature sensor and the humidity sensor, And an integrated controller for receiving and storing measurement results of a plurality of picoammeters, the method comprising the steps of:

When the measured values of the temperature sensor and the humidity sensor correspond to the evaluation environment by controlling the air conditioning means, the measurement result values of the respective picoamperes are sequentially received, and the error of each picoamperes is evaluated And an individual device error evaluation step of evaluating the individual device error evaluation step when the measured picoamperes satisfy the set error range so that the respective picoamperes transmit measurement result values under different environmental conditions And an environmental impact assessment step is performed on the picoamperes.

Preferably, the individual device error evaluating step applies a channel control signal such that each picoamperm has the same off-time and measurement time.

The environmental impact assessment step may include controlling the air conditioning means so that the interior of the chamber has various temperature and humidity conditions and applying a channel control signal such that each picoamperm has different evaluation environment histories under various temperature and humidity conditions desirable.

And controlling the air conditioning means after the environmental impact assessment step, when the measured values of the temperature sensor and the humidity sensor correspond to the evaluation environment, the measurement result values of the respective picoammeters are sequentially received, It is even more desirable to perform the individual instrument error re-evaluation step to reevaluate the error of the picoamperes of.

The apparatus and method for evaluating reliability of a picoampleter according to the present invention can test a plurality of picoampere meters at the same time under the same environmental conditions to more accurately confirm errors and defects of individual picoampere meters,

In addition, since a plurality of picoamperes can be evaluated by applying various environmental conditions in one test, it is possible to improve the accuracy of the reliability evaluation and reduce the time required for the reliability evaluation.

1 is a block diagram showing a picoamperes reliability evaluation apparatus according to a first embodiment of the present invention;
2 is a block diagram showing a picoamperes reliability evaluation apparatus according to a second embodiment of the present invention.
3 is a flowchart illustrating a picoamperes reliability evaluation method according to an embodiment of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or preliminary meaning and the inventor shall properly define the concept of the term in order to describe its invention in the best possible way It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. It should be noted that the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention, It should be understood that various equivalents and modifications are possible.

1 is a block diagram showing a picoamperes reliability evaluation apparatus according to a first embodiment of the present invention.

The picoamperes reliability evaluating apparatus according to the present invention includes a plurality of picoamperes to be evaluated and can be evaluated at the same time, thereby preventing an error in the evaluation results from occurring in accordance with environmental factors at the time of evaluation, thereby improving the reliability of evaluation And it is also possible to shorten the time required for the reliability evaluation by allowing a plurality of pico amps to be used to evaluate the influence depending on the environment.

As shown, the picoamperes reliability evaluation apparatus according to the first embodiment of the present invention includes a power source unit 110, a multi-channel multiplexer 120, a plurality of amps 130, an integrated controller 150, .

The power source unit 110 outputs the source power measured by the picoampermeter 130. The power source unit 110 may output a constant current according to an applied power control signal, and may precisely control and output power to a picoamperes unit.

The power source unit 110 outputs a constant current according to a power control signal applied from an integrated controller 150, which will be described later. The power source unit 110 may output a constant current or output a sine wave power source, So that it is possible to precisely output the current of

The multichannel multiplexer 120 is provided between the power source unit 110 and the plurality of picoamperes 130. The multichannel multiplexer 120 converts the current output from the power source unit 110 into a single picoamper 130, .

In the illustrated embodiment, five picoampliers 130 are provided to indicate a five-channel multiplexer 120, and the channel type of the multi-channel multiplexer 120 can be increased or decreased as needed.

The multi-channel multiplexer 120 selects one picoamper 130 in a time-division manner. In this case, the multi-channel multiplexer 120 selects one picoamper 130 according to the channel control signal applied from the integrated controller 150, And the picoamperes to be supplied with the currents applied from the power source 110 are selected.

The picoampermeter 13 is a device to be measured. The picoampermeter 13 measures a current value supplied from the multichannel multiplexer 120 and transmits the measurement result of the measured current to the integrated controller 150.

The integrated controller 150 provides a power supply signal to the power source unit 110 and provides a channel control signal of the multichannel multiplexer 120 and receives and stores measurement results of a plurality of picoamperes . The integrated control unit 150 may be configured to mount an application program in a PC or a notebook computer.

A power supply signal provided to the power source unit 110 and a channel control signal transmitted to the multichannel multiplexer 120 are configured in association with each other.

For example, when a constant current measurement error test is performed using a 5-channel multiplexer as shown in the figure, the power source unit 110 continuously supplies 100 pico amps (100 pico amps), 100 pico amps (1000 pico amps) And the channel control signal may be set to be uniformly delivered to the picoamperes of each channel by dividing the supply time of each constant current by 1/5.

2 is a block diagram illustrating a picoamperes reliability evaluation apparatus according to a second embodiment of the present invention.

The picoamperes reliability evaluation apparatus according to the second embodiment of the present invention further includes an environmental chamber 140, an air conditioning means 142, a temperature sensor 144, and a humidity sensor 146 .

The environmental chamber 140 serves to receive a plurality of picoamperes 130 and to allow the picoamperes 140 to be placed in a particular environment. The power source unit 110 and the multichannel multiplexer 120 are preferably disposed outside the environmental chamber 140. The power source unit 110 and the multichannel multiplexer 120 may be disposed outside the environmental chamber 140. [ This is to prevent the multi-channel multiplexer 120 from being affected by the power source unit 110 due to the internal environment of the chamber.

The air conditioning unit 142 controls the environment such as temperature and humidity inside the environmental chamber 140, and the operation of the air conditioning unit 142 is controlled by the integrated controller 150.

The temperature sensor 144 measures the temperature inside the environmental chamber 140 and transmits the measured temperature value to the integrated controller 150.

The humidity sensor 146 measures the humidity inside the environmental chamber 140 and transmits the measured temperature value to the integrated controller 150.

An additional device for additionally generating an environmental factor other than temperature and humidity and an additional sensor for measuring an additional environmental factor may be additionally provided inside the environmental chamber 140. [ For example, to evaluate the influence of the vibration environment, a vibrator or the like for applying vibration to the picoammeter may be installed.

Measuring instruments may be affected by temperature and humidity, so that the picoampermeter can evaluate what characteristics it exhibits at a specific temperature and humidity.

In the second embodiment of the present invention, the integrated control unit 140 controls the air conditioning unit 142 to change the environment inside the chamber. When the changed environmental factors (temperature, humidity) are measured as the evaluation target values, It is preferable to apply the channel control signal to the channel multiplexer 120 to perform the evaluation.

3 is a flowchart illustrating a picoamperes reliability evaluation method according to an embodiment of the present invention.

Hereinafter, a reliability evaluation method using the above-described picoamperes reliability evaluation apparatus will be described.

As shown, the picoamperes reliability evaluation method according to the embodiment of the present invention includes an individual device error evaluation step (S310), an environmental impact evaluation step (S320), and an individual device error re-evaluation step (S330).

The individual device error evaluation step (S310) is an evaluation step for evaluating each picoampermeter under the same condition and measuring a change in precision of each device.

In the individual device error evaluation step (S310), each picoampermeter applies the same current value in the same environment (temperature and humidity), and measures the resultant value.

In the individual device error evaluation step (S310), it is preferable that a channel control signal is applied such that each picoamperes have the same off-time and measurement time.

Through the individual device error evaluation step (S310), it is possible to confirm the accuracy change and the error value of each device, and if the evaluation target devices all have the satisfactory accuracy, the environmental impact evaluation step (S320) is continuously performed .

If it is determined in step S310 that the specific picoamperes are out of the error range, the device may be determined to be defective and replaced, and the individual device error evaluation step S310 may be performed again.

In the environmental impact assessment step S320, if it is determined that the devices to be evaluated are satisfactory in terms of the error range and are reliable through the individual device error evaluation step (S310), various environmental factors can be measured in a short time .

The environmental impact assessment step S320 may include controlling the air conditioning means so that the interior of the chamber has various temperature and humidity conditions and controlling the channel control signals such that each picoamperm has different evaluation environment histories under various temperature and humidity conditions .

The environmental impact assessment may be performed in a normal operating environment, in a poor operating environment, and may be subjected to various environmental conditions.

The environmental impact assessment can measure changes in precision with continuous operation for a long period of time, changes in precision in response to abrupt changes in measured current values, changes in precision in a high temperature environment deviating from a normal temperature, or in a low temperature environment deviating from a normal temperature .

Conventionally, a single device has been used to evaluate these effects. In such a case, it is difficult to confirm whether the error range has changed due to various factors.

For example, it is said that there is a problem in the accuracy in the low-temperature impact evaluation by continuously performing the low-temperature impact evaluation after the high-temperature environment evaluation. It may be unclear whether the change in the precision is due to the low temperature or the long- To clarify this, it is necessary to evaluate it repeatedly in various environmental histories.

The present invention can reduce the time required for environmental impact assessment by allowing various environmental factors to be assigned to one environmental chamber and allowing individual picoamperes to be evaluated with different environmental histories, The effect can be improved.

When one picoampermeter is being evaluated, the other picoamperes are turned off, so that a variety of changes in the pause time and operating time can be given, so that one experiment can measure changes in various environments.

Further, after performing the environmental impact assessment, the individual device error re-evaluation step (S330) may be performed.

The individual device error re-evaluation step (S330) controls the air conditioning means. If the measurement values of the temperature sensor and the humidity sensor correspond to the evaluation environment, the measurement result values of the respective picoamperes are sequentially received, Is to reevaluate the error of the picoampere meter.

The individual device error reevaluation step S330 is a step in which each device gives the normal operating environment again after the environmental impact assessment step S320 and performs the evaluation. The error generated in the environmental impact assessment step S320 is an environmental factor , Or whether it was permanent due to environmental factors.

As described above, in the picoamperes reliability evaluation apparatus and evaluation method according to the present invention, the precision of a plurality of picoamperes is evaluated at one time, the change in accuracy due to various environments is evaluated after the accuracy evaluation, The accuracy can be evaluated again, so that the time required for the reliability evaluation, which takes a long time, can be shortened and the reliability of the evaluation result can be improved.

It is to be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and the scope of the present invention will be indicated by the appended claims rather than by the foregoing detailed description. It is intended that all changes and modifications that come within the meaning and range of equivalency of the claims, as well as any equivalents thereof, be within the scope of the present invention.

110: Power source unit
120: Multichannel multiplexer
130: pico amps
140: environmental chamber
142:
144: Temperature sensor
146: Humidity sensor
150:
S310: Individual device error evaluation step
S320: Environmental Impact Assessment Phase
S330: Individual device error re-evaluation step

Claims (8)

A power source unit for outputting a constant current according to an applied power control signal;
A multi-channel multiplexer for dividing the output constant current of the power source unit into a plurality of picoamperes as a device under test according to an applied channel control signal;
A plurality of picoamperes connected to respective channels of the multi-channel multiplexer; And
And an integrated controller for providing a power supply signal applied to the power source unit and providing a channel control signal of the multi-channel multiplexer and receiving and storing measurement result values of the plurality of picoamperes, Device.
The method according to claim 1,
An environment chamber for accommodating the plurality of to-be-
An air conditioning means for controlling the temperature and humidity inside the environmental chamber,
A temperature sensor for measuring a temperature inside the environmental chamber,
Further comprising a humidity sensor for measuring the humidity inside the environmental chamber,
Wherein the air conditioning means is controlled by an environmental signal of the integrated control portion,
Wherein the measured values of the temperature sensor and the humidity sensor are transmitted to the integrated controller.
The method according to claim 1,
Wherein the multi-channel multiplexer connects the power source unit and one of the plurality of picoamper meters in a time-division manner.
3. The method of claim 2,
Wherein the integrated controller applies a channel control signal to the multichannel multiplexer according to a measured value of the temperature sensor and the humidity sensor.
A multi-channel multiplexer for dividing the output constant current of the power source unit into a plurality of picoamperes to be measured in accordance with an applied channel control signal, and transmitting the constant currents; Wow,
A plurality of picoamperes connected to each channel of the multi-channel multiplexer; an environment chamber accommodating the plurality of devices to be measured; an air conditioning means for controlling temperature and humidity inside the environment chamber; A humidity sensor for measuring the humidity inside the environmental chamber, and a power supply signal applied to the power source unit to provide a channel control signal of the multi-channel multiplexer, And an integrated controller for receiving the measured values of the plurality of picoamperes and receiving the measurement values of the temperature sensor and the humidity sensor and for storing the measured result values of the plurality of picoamperes. In the method,
When the measured values of the temperature sensor and the humidity sensor correspond to the evaluation environment by controlling the air conditioning means, the measurement result values of the respective picoamperes are sequentially received, and the error of each picoamperes is evaluated An individual device error evaluation step,
Performing an environmental impact assessment step of causing each picoampermeter to transmit measurement result values under different environmental conditions when the measurement object picoamperes as a result of the evaluation of the individual device error evaluation step satisfy all the set error ranges Characterized in that the picoamperes reliability evaluation method.
6. The method of claim 5,
The individual device error evaluation step
And a channel control signal is applied so that each of the picoamperes has the same off-time and measurement time.
6. The method of claim 5,
The environmental impact assessment step may include controlling the air conditioning means so that the interior of the chamber has various temperature and humidity conditions and applying a channel control signal such that each picoamperm has different evaluation environment histories under various temperature and humidity conditions Characterized in that the picoamperes reliability evaluation method.
6. The method of claim 5,
After the environmental impact assessment step,
The control means controls the air conditioning means to sequentially receive the measurement result values of the respective picoamperes when the measured values of the temperature sensor and the humidity sensor correspond to the evaluation environment and reevaluate the error of each picoamperes in the same environment And an individual device error reevaluation step of performing the individual device error reevaluation step.
KR1020150071084A 2015-05-21 2015-05-21 Testing device and testing method of pico amphere meter KR101691639B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110531308A (en) * 2019-10-11 2019-12-03 国网福建省电力有限公司电力科学研究院 A kind of measurement error and its correction of temperature drift validity check method of electric energy meter calibration variation of ambient temperature
CN111351999A (en) * 2020-03-27 2020-06-30 深圳市倍通检测股份有限公司 Electronic intelligent equipment detection system
CN111580379A (en) * 2020-05-11 2020-08-25 威胜集团有限公司 Time correction method, device and computer readable storage medium

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Publication number Priority date Publication date Assignee Title
JP2006258686A (en) * 2005-03-18 2006-09-28 Agilent Technol Inc Reliability measuring device and measuring method
KR20090045565A (en) * 2007-11-02 2009-05-08 전훈 Thermo-hygrostat training kit
KR20140044573A (en) * 2012-10-05 2014-04-15 엘에스산전 주식회사 Apparatus for multi channel resistance measurement using constant current source

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006258686A (en) * 2005-03-18 2006-09-28 Agilent Technol Inc Reliability measuring device and measuring method
KR20090045565A (en) * 2007-11-02 2009-05-08 전훈 Thermo-hygrostat training kit
KR20140044573A (en) * 2012-10-05 2014-04-15 엘에스산전 주식회사 Apparatus for multi channel resistance measurement using constant current source

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110531308A (en) * 2019-10-11 2019-12-03 国网福建省电力有限公司电力科学研究院 A kind of measurement error and its correction of temperature drift validity check method of electric energy meter calibration variation of ambient temperature
CN111351999A (en) * 2020-03-27 2020-06-30 深圳市倍通检测股份有限公司 Electronic intelligent equipment detection system
CN111580379A (en) * 2020-05-11 2020-08-25 威胜集团有限公司 Time correction method, device and computer readable storage medium
CN111580379B (en) * 2020-05-11 2021-10-08 威胜集团有限公司 Time correction method, device and computer readable storage medium

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