CN105300269B - A kind of wireless accurate strain gauge means and a kind of wireless accurate strain measurement method - Google Patents
A kind of wireless accurate strain gauge means and a kind of wireless accurate strain measurement method Download PDFInfo
- Publication number
- CN105300269B CN105300269B CN201510791549.1A CN201510791549A CN105300269B CN 105300269 B CN105300269 B CN 105300269B CN 201510791549 A CN201510791549 A CN 201510791549A CN 105300269 B CN105300269 B CN 105300269B
- Authority
- CN
- China
- Prior art keywords
- voltage
- accurate
- strain
- module
- measurement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The present invention relates to a kind of wireless accurate strain gauge means and a kind of wireless accurate strain measurement method, the control panel including cabinet, on cabinet and the measurement module set on cabinet inside, WiFi module；The control panel is for realizing human-computer interaction；The measurement module includes digital control module and precision voltage source module；The precision voltage source module includes constant temperature a reference source, accurate variable voltage source, accurate voltage measuring circuit, strain bridge driving circuit and strain bridge measuring circuit；The digital control module includes processor, debugging interface, serial ports, WiFi module interface.It realizes the input of calibration system simultaneously of a high-accuracy voltage table, export, the quantity of calibration instrument capable of reducing using, improve calibration speed.
Description
Technical field
The present invention relates to strain gauge means fields, and more specifically, it relates to a kind of wireless accurate strain gauge means
With a kind of wireless accurate strain measurement method.
Background technique
Strain measurement technique is widely used, by the great manufacturing equipment of mechanical engineering of dead load effect, high-speed rail automobile, wheel
Ship, nuclear power, civil construction, hydraulic engineering, bridge, road contain tunnel engineering and metallurgy, petroleum, chemical field it is great, important
Key member requires to use strain gauge means.Key member great to these, important is tested, and needs when verifying to use
Wireless precision strain gauge means.The strain gauge means of remote operation can be used to online, the long-range monitoring of equipment simultaneously.
One key technical index of strain gauge means is measurement accuracy.Influence precision because being known as: measuring device base
The stability in quasi- source, energisation mode, the pressure drop of electric current and noise on ground wire.Currently, the precision of strain gauge means can also be into
One step improves；And it can realize that driving voltage is adjustable；Sensor parameters can be set；It carries out the function such as remotely operating.These functions
Realization will greatly increase the values of strain gauge means.
From currently on the market, there are no it is a kind of be able to achieve high-precision, Parameter adjustable, can wireless remote operation strain survey
Measure device.
Summary of the invention
In view of this, it is necessary to for above-mentioned problem, a kind of wireless accurate strain gauge means are provided and one kind is wireless
Accurate strain measurement method, realize high-precision, Parameter adjustable, can wireless remote operation.
To achieve the goals above, technical scheme is as follows:
A kind of wireless accurate strain gauge means, including cabinet, the control panel on cabinet and are set in cabinet
Measurement module, the WiFi module in portion；
The control panel is for realizing human-computer interaction；
The measurement module includes digital control module and precision voltage source module；The precision voltage source module includes constant temperature base
Quasi- source, accurate variable voltage source, accurate voltage measuring circuit, strain bridge driving circuit and strain bridge measuring circuit；It is described
Digital control module includes processor, debugging interface, serial ports, WiFi module interface.
The constant temperature a reference source is separately connected accurate variable voltage source and accurate voltage measuring circuit, the precision adjustable electric
Potential source connects strain bridge driving circuit, and the strain bridge driving circuit connects strain bridge measuring circuit；The WiFi mould
Block interface connects WiFi module
Preferably, the digital control module and the power supply of precision voltage source module are mutually isolated, and ground wire mutually every
From not placing other elements around constant temperature a reference source；Constant temperature a reference source and aerial lug concentrate on two paths；Non- wiring region
Domain hollow processing.
Preferably, the strain bridge measuring circuit includes at least a false zero generation circuit, for eliminating Earth noise
The error generated with earth-current pressure drop；
Preferably, the strain bridge driving circuit includes voltage reversing circuit, the voltage reversing circuit input
Terminate the output end of precision voltage source module；Voltage reversing circuit output end is as strain bridge driving voltage cathode, to produce
The excitation power supply of Symmetrical；The voltage reversing circuit includes amplifier reverser and PNP triode, the amplifier reverser with
PNP triode composition is reversed to expand current circuit, and the PNP triode base stage and amplifier inverter output are connected to back biased diode,
It is connected between PNP triode base stage and amplifier inverter output with resistance, with resistance phase between PNP triode and power cathode
Even.
Preferably, the false zero circuit includes a pair of each other to the push-pull configuration of the triode composition of pipe, it is described to push away
Tying-in structure and an accurate amplifier form a follower, and the input terminal of the push-pull configuration connects positive-negative power by resistance, described
The zero reference point of the input termination a reference source of follower, the output end of follower are exported as false zero, false zero output and precision electricity
It is connected between the ground wire of source module with the resistance of (10-100 ohm).
Compared with prior art, the beneficial effects of the present invention are:
1, using the Zero potential reference of false zero circuit generation system, and multiple false zero circuits can be used, generates more
A Zero potential reference, the noise bring that can eliminate power ground influence, and can also eliminate back the influence that earth-current generates pressure drop, also
Most of parasitic thermocouple can be eliminated and generate influence of the voltage to precision voltage source.
2, constant temperature a reference source does not place other elements nearby, and route is drawn using broken line, in constant temperature benchmark source region, non-cloth
Line region hollow processing increases thermal resistance, improves the stability of constant temperature a reference source.
3, negative energize voltage is generated using voltage reversing circuit, strain bridge may be implemented using the excitation of Symmetrical power supply
The output voltage of bridge is conducive to the design of bridge output amplifier in zero crossings, when accurate voltage measurement ADC inputs model
When enclosing little, still it can be motivated using this programme with high voltage.Sensor input driving voltage it is bigger, sensor it is sensitive
It spends higher.
4, the sensor parameters of this measuring device can be adjusted, and driving voltage is adjustable, can cooperate the sensor of different parameters；
The present apparatus has accurate adjustable voltage output function, and accurate voltage measures function.
5, the present apparatus is realized the input of calibration system simultaneously of a high-accuracy voltage table, is exported, prover capable of reducing using
The quantity of device improves calibration speed.
6, the present apparatus connects internet by WiFi wireless interface, and long-range PC can pass through the Server remote on internet
This measuring device is controlled, long-range monitoring is realized.
Detailed description of the invention
Fig. 1 shows wireless accurate strain detection testing device panel of the invention；
Fig. 2 shows the structural block diagrams of accurate measurement module of the invention；
Fig. 3 shows the false zero generation circuit of strain bridge measuring circuit；
Fig. 4 shows polarity of voltage circuit for reversing；
Fig. 5 shows wireless accurate strain gauge means calibration connection type；
Fig. 6 shows accurate strain measurement touch screen interface.
Specific embodiment
It is wireless to a kind of wireless accurate strain gauge means of the present invention and one kind with reference to the accompanying drawings and examples
Accurate strain measurement method is described further.
It is a kind of wireless accurate strain gauge means of the present invention and a kind of wireless accurate strain measurement method below
Preferred example, not therefore limit the scope of protection of the present invention.
A kind of wireless accurate strain gauge means, including cabinet, the control panel on cabinet and are set in cabinet
Measurement module, the WiFi module in portion；The cabinet is made of suitcase, and control panel is lain in suitcase, and measurement module is flat
It is placed under panel, in suitcase；Human-computer interaction interface is as described in Figure 1 on panel, and Fig. 6 shows accurate strain measurement touch screen circle
Face.The constant temperature a reference source is separately connected accurate variable voltage source and accurate voltage measuring circuit, the precision variable voltage source
Strain bridge driving circuit is connected, the strain bridge driving circuit connects strain bridge measuring circuit；The WiFi module connects
Mouth connection WiFi module
The measurement module includes digital control module and precision voltage source module, digital control module and precision voltage source module
It is isolated by isolator；The precision voltage source module includes constant temperature a reference source, accurate variable voltage source, accurate voltage measurement electricity
Road, strain bridge driving circuit and strain bridge measuring circuit；The digital control module includes processor, debugging interface, string
Mouth, WiFi module interface.
In the present embodiment, the accurate variable voltage source is using a piece of 20 DAC, AD5791.The chip uses
Positive and negative reference voltage.The output end of chip is realized zero volt and is exported to positive reference voltage using accurate add circuit.The circuit
The reference zero of accurate voltage accesses false zero reference point, without connecing power ground.It is transmitted between the chip and processor with magnetic coupling
Signal is electrically isolated to realize.
Preferably, the strain bridge measuring circuit includes at least a false zero generation circuit, for eliminating Earth noise
The error generated with earth-current pressure drop；
Preferably, the digital control module and the power supply of precision voltage source module are mutually isolated, and ground wire mutually every
From.
In the present embodiment, constant temperature a reference source generates electricity by LTZ1000 constant temperature reference power supply chip and peripheral reference voltage
Road composition.Constant temperature a reference source is placed on the wiring board of hollow out, increases thermal resistance in this way.A reference source and external circuit are routed to folding
Cable architecture, referring to fig. 2.The reference zero electrical voltage point of system is generated using false zero circuit, with not using system power supply for benchmark voltage
Zero point.Input terminal of the constant temperature a reference source point of zero voltage separate cabling to false zero circuit.
The false zero circuit is constant temperature a reference source reference zero referring to Fig. 3, " Z-S_GND "." REF_GND " is the void of system
Zero reference point and the related reference point of accurate voltage all use false zero reference point.Multiple false zero circuits can be used as needed.By
In the self-regulation ability of the circuit, accurate zero-potential point can be provided when having high current reflux, temperature drift, power supply shakiness,
It ensure that the precision of system.
Preferably, the strain bridge driving circuit includes voltage reversing circuit, the voltage reversing circuit input
Terminate the output end of precision voltage source module；Voltage reversing circuit output end is as strain bridge driving voltage cathode, to produce
The excitation power supply of Symmetrical；The voltage reversing circuit includes amplifier reverser and PNP triode, the amplifier reverser with
PNP triode composition is reversed to expand current circuit, and the PNP triode base stage and amplifier inverter output are connected to back biased diode,
It is connected between PNP triode base stage and amplifier inverter output with resistance, with resistance phase between PNP triode and power cathode
Even.
Referring to fig. 4, which can provide the voltage source excitation of Symmetrical to four arm strain bridges to the voltage reversing circuit.
The voltage output of electric bridge near no-voltage, is conducive to the design of measuring and amplifying circuit and sample circuit always.For example, when output
When voltage is 10V, bridge excitation can reach 20V.Electric bridge output at this time is still near zero volt, and the sample range of ADC is in 1V
?.If not having to symmetrical drive, when 10V driving voltage, electric bridge output will be near 5V, and the sample range of ADC is greater than 5V.
The ADC of same digit, range extension will reduce precision.So symmetrical drive technology of the present invention is used, so that driving voltage improves
One times, and reduce output area, improve precision.
Preferably, the false zero circuit includes a pair of each other to the push-pull configuration of the triode composition of pipe, it is described to push away
Tying-in structure and an accurate amplifier form a follower, and the input terminal of the push-pull configuration connects positive-negative power by resistance, described
The zero reference point of the input termination a reference source of follower, the output end of follower are exported as false zero, false zero output and precision electricity
It is connected between the ground wire of source module with the resistance of (10-100 ohm).
A kind of wireless accurate strain measurement method, using above-mentioned wireless accurate strain gauge means, the measurement method
The following steps are included:
S1, system calibration；
S2, remote operation；
S3, accurate voltage output and measurement；
S4, accurate strain testing.
Preferably, as shown in figure 5, the step S1 is specifically included: with the accurate adjustable electric of relay connection system
The output port of potential source and the port of accurate voltage measuring circuit, and connect external precision voltmeter；Accurate variable voltage source is defeated
Uncorrected output voltage (Vo), accurate voltage measuring circuit measurement obtain voltage value (Vi) out, and accurate voltage table measurement obtains
Voltage value (Vm)；(Vo, Vi, Vm) is one group of calibration value, and setting different output voltage (Vo) can be obtained multiple groups calibration value, is formed
One set { Von,Vin,Vmn}；The collection is combined into the calibration data of system, when exporting precision voltage source, passes through { Vo in setn,
VmnSubset carry out piecewise linear correction, when accurate voltage measurement when, pass through set in { Vin,VmnSubset progress piecewise linearity
Correction.
Preferably, the step S2 is specifically included: having a WiFi module on device, which accesses on internet
Server, local computer logins the same server, by the server, local computer can setting sensor parameter,
And strain gauge means are sent to, the voltage value that strain gauge means are arrived according to the parameter and local measurement of remote setting calculates
Strain value is obtained, and is sent to local computer.
Preferably, the step S3 is specifically included: setting output voltage and system calibration data obtain it is revised
Setting value, and digital analog converter is written in setting value；When voltage measurement, according to the data and system calibration for reading analog-digital converter
Data obtain revised measured value；Measurement process includes the Digital Signal Processing means such as average, filtering.
Preferably, the step S4 is specifically included: according to the sensitivity coefficient (K) of sensor, strain bridge number
(N), driving voltage (E), sensor output voltage (e), according to equationThe strain stress for acquiring sensor is being
In system, parameter K, N, E can be set, and e is obtained by accurate voltage measurement module measurement.
Compared with prior art, the beneficial effects of the present invention are:
1, using the Zero potential reference of false zero circuit generation system, and multiple false zero circuits can be used, generates more
A Zero potential reference, the noise bring that can eliminate power ground influence, and can also eliminate back the influence that earth-current generates pressure drop, also
Most of parasitic thermocouple can be eliminated and generate influence of the voltage to precision voltage source.
2, constant temperature a reference source does not place other elements nearby, and route is drawn using broken line, in constant temperature benchmark source region, non-cloth
Line region hollow processing increases thermal resistance, improves the stability of constant temperature a reference source.
3, negative energize voltage is generated using voltage reversing circuit, strain bridge may be implemented using the excitation of Symmetrical power supply
The output voltage of bridge is conducive to the design of bridge output amplifier in zero crossings, when accurate voltage measurement ADC inputs model
When enclosing little, still it can be motivated using this programme with high voltage.Sensor input driving voltage it is bigger, sensor it is sensitive
It spends higher.
4, the sensor parameters of this measuring device can be adjusted, and driving voltage is adjustable, can cooperate the sensor of different parameters；
The present apparatus has accurate adjustable voltage output function, and accurate voltage measures function.
5, the present apparatus is realized the input of calibration system simultaneously of a high-accuracy voltage table, is exported, prover capable of reducing using
The quantity of device improves calibration speed.
6, the present apparatus connects internet by WiFi wireless interface, and long-range PC can pass through the Server remote on internet
This measuring device is controlled, long-range monitoring is realized.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (5)
1. a kind of wireless accurate strain measurement method, which is characterized in that using a kind of wireless accurate strain gauge means, the survey
Amount method the following steps are included:
S1, system calibration；
S2, remote operation；
S3, accurate voltage output and measurement；
S4, accurate strain testing；
The step S1 is specifically included: being surveyed with the output port and accurate voltage of the accurate variable voltage source of relay connection system
The port of circuit is measured, and connects external precision voltmeter；Accurate variable voltage source exports uncorrected output voltage Vo, accurate electricity
Pressure measuring circuit measurement obtains voltage value Vi, and accurate voltage table measurement obtains voltage value Vm；Vo, Vi, Vm are one group of calibration value, if
Fixed different output voltage Vo, can be obtained multiple groups calibration value, forms a set { Von,Vin,Vmn}；The collection is combined into system
Calibration data passes through { Vo in set when exporting precision voltage sourcen,VmnSubset progress piecewise linear correction, when accurate voltage is surveyed
When amount, pass through { Vi in setn,VmnSubset progress piecewise linear correction；
The step S4 is specifically included: according to the sensitivity coefficient K of sensor, strain bridge number N, driving voltage E, sensor
Output voltage e, according to equationAcquire the strain stress of sensor, in systems, parameter K, N, E can be set, e by
Accurate voltage measurement module measurement obtains；
The described wireless accurate strain gauge means include cabinet, the control panel on cabinet and are set to cabinet inside
Measurement module, WiFi module；
The control panel is for realizing human-computer interaction；
The measurement module includes digital control module and precision voltage source module；The precision voltage source module includes constant temperature benchmark
Source, accurate variable voltage source, accurate voltage measuring circuit, strain bridge driving circuit and strain bridge measuring circuit；The number
Word control module includes processor, debugging interface, serial ports, WiFi module interface；
The constant temperature a reference source is separately connected accurate variable voltage source and accurate voltage measuring circuit, the precision variable voltage source
Strain bridge driving circuit is connected, the strain bridge driving circuit connects strain bridge measuring circuit；The WiFi module connects
Mouth connection WiFi module；
The digital control module and the power supply of precision voltage source module are mutually isolated, and ground wire is mutually isolated, constant temperature a reference source week
It encloses and does not place other elements；Constant temperature a reference source and aerial lug concentrate on two paths；Non- wiring area hollow processing；
The strain bridge measuring circuit includes at least a false zero generation circuit, generates for eliminating Earth noise and earth-current pressure drop
Error.
2. the method according to claim 1, wherein the step S2 is specifically included: having a WiFi on device
Module, the module access the server on internet, and local computer logins the same server, local by the server
Computer can setting sensor parameter, and be sent to strain gauge means, strain gauge means according to the parameter of remote setting and
The voltage value that local measurement arrives is calculated strain value, and is sent to local computer.
3. the method according to claim 1, wherein the step S3 is specifically included: setting output voltage and be
System calibration data obtains revised setting value, and digital analog converter is written in setting value；When voltage measurement, according to reading modulus
The data and system calibration data of converter obtain revised measured value；Measurement process includes averagely, at filtered digital signal
Reason means.
4. the method according to claim 1, wherein the strain bridge driving circuit includes voltage reversal electricity
Road, the output end of the voltage reversing circuit input termination precision voltage source module；Voltage reversing circuit output end is as strain bridge
Driving voltage cathode, to produce the excitation power supply of Symmetrical；The voltage reversing circuit includes amplifier reverser and PNP
Triode, the amplifier reverser and the reversed expansion current circuit of PNP triode composition, the PNP triode base stage and amplifier are reversed
Device output is terminated with back biased diode, is connected between PNP triode base stage and amplifier inverter output with resistance, PNP triode
It is connected between power cathode with resistance.
5. the method according to claim 1, wherein the false zero generation circuit includes a pair each other to pipe
The push-pull configuration of triode composition, the push-pull configuration and an accurate amplifier form a follower, the input of the push-pull configuration
End connects positive-negative power, the zero reference point of the input termination a reference source of the follower by resistance, and the output end of follower is made
For false zero output, connected between false zero output and the ground wire of precision voltage source module with 10-100 ohm of resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510791549.1A CN105300269B (en) | 2015-11-16 | 2015-11-16 | A kind of wireless accurate strain gauge means and a kind of wireless accurate strain measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510791549.1A CN105300269B (en) | 2015-11-16 | 2015-11-16 | A kind of wireless accurate strain gauge means and a kind of wireless accurate strain measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105300269A CN105300269A (en) | 2016-02-03 |
| CN105300269B true CN105300269B (en) | 2019-10-08 |
Family
ID=55197813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510791549.1A Active CN105300269B (en) | 2015-11-16 | 2015-11-16 | A kind of wireless accurate strain gauge means and a kind of wireless accurate strain measurement method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105300269B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771495A (en) * | 2016-12-30 | 2017-05-31 | 芜湖顺景自动化设备有限公司 | A kind of plug line drop measurement equipment of highly effective and safe insulation |
| CN106772924B (en) * | 2017-03-01 | 2022-11-08 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Debugging device and debugging method for continuous zooming optical lens motion assembly |
| CN108089239A (en) * | 2017-12-19 | 2018-05-29 | 中国地震局地壳应力研究所 | A kind of d.c.voltage calibrator and client |
| CN108931956B (en) * | 2018-09-03 | 2024-03-26 | 康泰医学系统（秦皇岛）股份有限公司 | Body temperature signal analog output device and method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2841491A1 (en) * | 1977-09-28 | 1979-04-05 | Itt Ind Gmbh Deutsche | BRIDGE CIRCUIT WITH STRAIN GAUGE |
| CN101655408A (en) * | 2009-08-28 | 2010-02-24 | 清华大学 | Detection circuit for non-common mode voltage strain bridge signal |
| CN201464092U (en) * | 2009-07-28 | 2010-05-12 | 湖北省电力试验研究院 | Wireless stress tester of hydroelectric generator set |
| CN102495652A (en) * | 2011-12-14 | 2012-06-13 | 广东省科学院自动化工程研制中心 | Adjustable high-precision voltage reference source |
| CN102707162A (en) * | 2011-12-31 | 2012-10-03 | 北京必创科技有限公司 | Strain acquisition circuit system and strain acquisition method |
| CN104331005A (en) * | 2014-10-13 | 2015-02-04 | 山西省交通科学研究院 | Dormancy and wake-up control system and dormancy and wake-up control method for wireless strain acquisition instrument |
| CN205209427U (en) * | 2015-11-16 | 2016-05-04 | 广东省自动化研究所 | Wireless accurate strain measuring device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57169603A (en) * | 1981-04-10 | 1982-10-19 | Mitsubishi Heavy Ind Ltd | Strain measuring method |
| CN201269982Y (en) * | 2008-07-16 | 2009-07-08 | 上海大学 | Linkage control signal processor |
-
2015
- 2015-11-16 CN CN201510791549.1A patent/CN105300269B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2841491A1 (en) * | 1977-09-28 | 1979-04-05 | Itt Ind Gmbh Deutsche | BRIDGE CIRCUIT WITH STRAIN GAUGE |
| CN201464092U (en) * | 2009-07-28 | 2010-05-12 | 湖北省电力试验研究院 | Wireless stress tester of hydroelectric generator set |
| CN101655408A (en) * | 2009-08-28 | 2010-02-24 | 清华大学 | Detection circuit for non-common mode voltage strain bridge signal |
| CN102495652A (en) * | 2011-12-14 | 2012-06-13 | 广东省科学院自动化工程研制中心 | Adjustable high-precision voltage reference source |
| CN102707162A (en) * | 2011-12-31 | 2012-10-03 | 北京必创科技有限公司 | Strain acquisition circuit system and strain acquisition method |
| CN104331005A (en) * | 2014-10-13 | 2015-02-04 | 山西省交通科学研究院 | Dormancy and wake-up control system and dormancy and wake-up control method for wireless strain acquisition instrument |
| CN205209427U (en) * | 2015-11-16 | 2016-05-04 | 广东省自动化研究所 | Wireless accurate strain measuring device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105300269A (en) | 2016-02-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105300269B (en) | A kind of wireless accurate strain gauge means and a kind of wireless accurate strain measurement method | |
| CN204101635U (en) | A kind of microresistivity survey instrument and electronic product process units | |
| CN106685421B (en) | Analog signal acquisition method and device | |
| CN103235189A (en) | High-precision micro resistor measurement method based on double-current voltage ratio method and measurement system for realizing method | |
| CN104698276A (en) | Resistor verifying system | |
| CN205209427U (en) | Wireless accurate strain measuring device | |
| CN104391259B (en) | Magnetic moment real-time test system and test method thereof | |
| CN113721071A (en) | System and method for measuring non-intrusive voltage to ground | |
| CN103293566B (en) | Signal detection circuit of atmospheric ozone sonde | |
| CN107505061A (en) | A kind of platinum resistance temperature measuring device in double-current source | |
| CN106645972A (en) | Platform used for detecting resistance value of small resistor | |
| CN111521857B (en) | Multi-conductor current measuring system based on TMR tunnel magnetic resistance | |
| CN102478422A (en) | Zero drift simulation calibrating method and device thereof | |
| CN210346590U (en) | Wireless static strain tester and wireless static strain test system | |
| CN202870025U (en) | Device for testing corrosion degree of steel cable | |
| CN206695925U (en) | A kind of multichannel RTD thermal resistance measurement modules | |
| Heidary et al. | An integrated interface circuit with a capacitance-to-voltage converter as front-end for grounded capacitive sensors | |
| CN106353643A (en) | Resistance proportion cable fault tester | |
| CN205941869U (en) | Measurement device for coil sensor resonance parameter | |
| CN206670832U (en) | A kind of device for lifting temperature survey precision | |
| CN110412485A (en) | A kind of output current detection circuit | |
| CN206038177U (en) | Three -way formula platinum resistance PT100 temperature measuring system | |
| CN104374488A (en) | High-precision dual-channel temperature measuring circuit for spacecraft ontrack leakage detection | |
| CN219935963U (en) | Voltage and current measurement channel of digital bridge and digital bridge | |
| CN219574243U (en) | High-resistance fault loop resistance precision measurement circuit for railway signal cable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 510000 building 15, 100 Hall of martyrs Road, Guangzhou, Guangdong Applicant after: GUANGDONG INSTITUTE OF INTELLIGENT MANUFACTURING Address before: 510070 building 13, 100 Hall of martyrs Road, Guangzhou, Guangdong Applicant before: Guangdong Institute of Automation |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 510000 building 15, 100 Hall of martyrs Road, Guangzhou, Guangdong Patentee after: Institute of intelligent manufacturing, Guangdong Academy of Sciences Address before: 510000 building 15, 100 Hall of martyrs Road, Guangzhou, Guangdong Patentee before: GUANGDONG INSTITUTE OF INTELLIGENT MANUFACTURING |