CN207963924U - A kind of calibration apparatus for instrument - Google Patents
A kind of calibration apparatus for instrument Download PDFInfo
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- CN207963924U CN207963924U CN201820378720.5U CN201820378720U CN207963924U CN 207963924 U CN207963924 U CN 207963924U CN 201820378720 U CN201820378720 U CN 201820378720U CN 207963924 U CN207963924 U CN 207963924U
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- 238000004804 winding Methods 0.000 claims description 3
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- 238000005859 coupling reaction Methods 0.000 abstract description 4
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- 238000004891 communication Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
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- 238000004164 analytical calibration Methods 0.000 description 1
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Abstract
The utility model discloses a kind of calibration apparatus for instrument, including：Resistance R31, capacitance C37, diode D29, light idol U13 and microcontroller；The first end connecting valve amount signal of resistance R31, the second end of resistance R31 are connect with the anode of diode in light idol U13；The cathode ground connection of diode in light idol U13；The first end of capacitance C37 is connected between resistance R31 and light idol U13, and the second end of capacitance C37 is connect with the cathode of diode in light idol U13；The anode of diode D29 is connected between capacitance C37 and light idol U13, and the cathode of diode D29 is connected between capacitance C37 and light idol U13；The output end of light idol U13 and the input terminal of microcontroller connect.On-off model is via resistance R31, capacitance C37, diode D29, to signal to the input terminal of light idol U13, light idol U13 outputs signal to microcontroller, microcontroller acquires the signal to judge the working condition of on-off model, to realize Phototube Coupling, anti-interference ability is enhanced, thus solves the technical issues of poor anti jamming capability in the prior art.
Description
Technical field
The utility model is related to instrument Calibration Technology field more particularly to a kind of calibration apparatus for instrument.
Background technology
Currently, carrying out the adjustment of on-off model to intelligence instrument is realized by the method for artificial short circuit input terminal
, this method is although easy to operate, but poor anti jamming capability, has seriously affected the accuracy of adjustment, has been unfavorable for intelligence instrument
Normal work.
Utility model content
The utility model solves poor anti jamming capability in the prior art by providing a kind of calibration apparatus for instrument
The technical issues of, realize the technique effect for improving adjustment accuracy.
The utility model provides a kind of calibration apparatus for instrument, including：Resistance R31, capacitance C37, diode
D29, light idol U13 and microcontroller；The first end of the resistance R31 is electrically connected the on-off model output end of meters under test, institute
The second end for stating resistance R31 is connect with the anode of diode in the light idol U13；The cathode of diode connects in the light idol U13
Ground；The second end and the anode of diode in the light idol U13 that the first end of the capacitance C37 is connected to the resistance R31
Between, the second end of the capacitance C37 and the cathode of diode in the light idol U13 are electrically connected；The anode of the diode D29
It is connected between the second end of the capacitance C37 and the cathode of diode in the light idol U13, the cathode of the diode D29
It is connected between the first end of the capacitance C37 and the anode of diode in the light idol U13；The signal of the light idol U13 is defeated
Outlet and the signal input part of the microcontroller are electrically connected.
Further, further include：Resistance R72, light idol U11, resistance R25, triode Q5, diode D21, relay K3 and
High tension protection circuit varistor RV4；The first end of the resistance R72 is electrically connected with the output end of the microcontroller, described
The second end of resistance R72 and the cathode of diode in the light idol U11 are electrically connected；The anode of diode in the light idol U11
Power supply is connected, the output end of the light idol U11 is electrically connected with the first end of the resistance R25；The second end of the resistance R25
It is connect with the base stage of the triode Q5；The emitter of the triode Q5 connects power supply, the collector of the triode Q5 with
The cathode of the diode D21 is electrically connected；The plus earth of the diode D21；The anode and cathode of the diode D21
Also it is electrically connected respectively with the first end and second end of the relay K3 coil windings；The high tension protection circuit varistor
The both ends of RV4 are electrically connected with the first contact output end of the relay K3 and the second contact output end respectively；The relay
The first contact output end of device K3 and the On-off signal end of the second contact output end and meters under test are electrically connected.
Further, further include：Capacitance C23, resistance R29, plucking number sign switch B1, resistance R27, resistance R30, resistance R28 and
Analog-to-digital conversion module；The both ends of the capacitance C23 are electrically connected with the pick-up output end of meters under test respectively；The capacitance C23
First end pass through the input terminal of the resistance R29 and the plucking number sign switch B1 and be electrically connected；The second end of the capacitance C23 with
The output end of the plucking number sign switch B1 is electrically connected；The first end electricity of the output end of the plucking number sign switch B1 and the resistance R27
Property connection；The second end of the resistance R27 and the first end of the resistance R28 are electrically connected；The first end of the resistance R30 connects
It is connected between the second end of the resistance R27 and the first end of the resistance R28, the second end ground connection of the resistance R30；It is described
The second end of resistance R28 and the signal input part of the analog-to-digital conversion module are electrically connected；The signal of the analog-to-digital conversion module
The signal input part of output end and the microcontroller is electrically connected.
Further, further include：Capacitance C26；The first end of the capacitance C26 is connected to the second end of the resistance R28
Between the signal input part of the analog-to-digital conversion module, the second end of the capacitance C26 is grounded.
Further, further include：Resistance R90, light idol U20, bleeder circuit, amplifier, resistance R96, resistance R97, triode
Q20, diode D40, diode D41 and connecting terminal OUT1；The first end and the signal of the microcontroller of the resistance R90 is defeated
Outlet is electrically connected, and the second end of the resistance R90 and the cathode of diode in the light idol U20 are electrically connected；The light is even
The anode connection power supply of diode in U20；The signal input part electricity of the signal output end of the light idol U20 and the bleeder circuit
Property connection；The signal output end of the bleeder circuit and the signal input part of the amplifier are electrically connected；The signal of the amplifier
The first end of output end and the resistance R97 is electrically connected；The transmitting of the second end of the resistance R97 and the triode Q20
Pole is electrically connected；The first end of the resistance R96 is connected to the transmitting of the second end and the triode Q20 of the resistance R97
Between pole, the second end of the resistance R96 connects power supply；The base earth of the triode Q20, the collection of the triode Q20
Electrode is connect with the anode of the diode D40；The cathode of the diode D40 and the cathode of the diode D41 electrically connect
It connects；The plus earth of the diode D41；The first end of the connecting terminal OUT1 is connected to the cathode of the diode D40
Between the cathode of the diode D41, the second end of the connecting terminal OUT1 and the analog input end electricity of meters under test
Property connection.
Further, further include：Current transformer, resistance R10 and the 2nd AD acquisition modules；The letter of the current transformer
The signal output end of number input terminal and meters under test is electrically connected；The letter at the both ends and the current transformer of the resistance R10
Number output end is electrically connected；The signal input part electricity of the signal output end of the current transformer and the 2nd AD acquisition modules
Property connection；The signal output end of the 2nd AD acquisition modules is electrically connected with the signal input part of the microcontroller.
Further, further include：Bleeder circuit, transformer, resistance R29 and the first AD acquisition modules；The bleeder circuit
Signal input part and meters under test signal output end be electrically connected；The signal output end of the bleeder circuit and the transformation
The primary coil of device is electrically connected；The secondary coil of the transformer and the signal input part of the first AD acquisition modules are electrical
Connection；The signal output end of the first AD acquisition modules is electrically connected with the signal input part of the microcontroller；The resistance
The both ends of R29 and the both ends of the secondary coil of the transformer are electrically connected.
Further, further include：Presentation device；The signal input part of the presentation device and the signal of the microcontroller are defeated
Outlet communicates to connect.
Further, the STC12C5628AD that the model of the microcontroller is produced by Jiangsu Guo Xin Science and Technology Ltd.s.
The one or more technical solutions provided in the utility model, have at least the following technical effects or advantages：
Meters under test provides on-off model and protects circuit via resistance R31, capacitance C37, diode D29, is arrived to signal
The input terminal of light idol U13, light idol U13 output signal to microcontroller, and microcontroller acquires the signal to judge the work of on-off model
Make state, to realize Phototube Coupling, enhance anti-interference ability, thus solves poor anti jamming capability in the prior art
Technical problem realizes the technique effect for improving adjustment accuracy.
Description of the drawings
Fig. 1 is that the calibration apparatus that the utility model embodiment provides carries out adjustment part to the On-off signal signal of instrument
Circuit diagram；
Fig. 2 is that the calibration apparatus that the utility model embodiment provides carries out adjustment part to the switching value output signal of instrument
Circuit diagram；
Fig. 3 is that the calibration apparatus that the utility model embodiment provides carries out adjustment part to the analog quantity output signals of instrument
Circuit diagram；
Fig. 4 is that the calibration apparatus that the utility model embodiment provides carries out adjustment part to the analog input signal of instrument
Circuit diagram.
Specific implementation mode
The utility model embodiment solves anti-interference in the prior art by providing a kind of calibration apparatus for instrument
The technical issues of energy force difference, realize the technique effect for improving adjustment accuracy.
The technical scheme in the embodiment of the utility model is to solve the above problems, general thought is as follows：
Meters under test provides on-off model and protects circuit via resistance R31, capacitance C37, diode D29, is arrived to signal
The input terminal of light idol U13, light idol U13 output signal to microcontroller, and microcontroller acquires the signal to judge the work of on-off model
Make state, to realize Phototube Coupling, enhance anti-interference ability, thus solves poor anti jamming capability in the prior art
Technical problem realizes the technique effect for improving adjustment accuracy.
Above-mentioned technical proposal in order to better understand, in conjunction with appended figures and specific embodiments to upper
Technical solution is stated to be described in detail.
Referring to the calibration apparatus for instrument that Fig. 1, the utility model embodiment are provided, including：Resistance R31, capacitance
C37, diode D29, light idol U13 and microcontroller；The first end of resistance R31 is electrically connected the on-off model output of meters under test
End, the second end of resistance R31 are connect with the anode of diode in light idol U13；The cathode ground connection of diode in light idol U13；Capacitance
The first end of C37 is connected between the second end of resistance R31 and the anode of diode in light idol U13, the second end of capacitance C37 with
The cathode of diode is electrically connected in light idol U13；The anode of diode D29 is connected in second end and the light idol U13 of capacitance C37
Between the cathode of diode, the cathode of diode D29 is connected to the anode of the first end and diode in light idol U13 of capacitance C37
Between；The signal output end of light idol U13 and the signal input part of microcontroller are electrically connected.
In order to realize the adjusting function of switching value output signal, referring to Fig. 2, further include：Resistance R72, light idol U11, resistance
R25, triode Q5, diode D21, relay K3 and high tension protection circuit varistor RV4；The first end and list of resistance R72
The output end of piece machine is electrically connected, and the second end of resistance R72 is electrically connected with the cathode of diode in light idol U11；In light idol U11
The anode connection power supply of diode, the output end of light idol U11 are electrically connected with the first end of resistance R25；The second end of resistance R25
It is connect with the base stage of triode Q5；The emitter of triode Q5 connects power supply, the collector of triode Q5 and bearing for diode D21
Pole is electrically connected；The plus earth of diode D21；Diode D21 anode and cathode also respectively with relay K3 coil windings
First end and second end be electrically connected；It is touched respectively with the first of relay K3 at the both ends of high tension protection circuit varistor RV4
Point output end and the second contact output end are electrically connected；The the first contact output end and the second contact output end of relay K3 with wait for
The On-off signal end for surveying instrument is electrically connected, and achievees the purpose that Self-regulation track meter switch amount.
Specifically, microcontroller sends out command signal, and through resistance R72, to signal to the input terminal of light idol U11, light idol U11 is defeated
Go out amplifying circuit of the signal through resistance R25 and triode Q5 compositions, protects circuit through diode D21, supplied to relay K3 pitch of the laps
Electricity, the contacts relay K3 conducting, by high tension protection circuit varistor RV4, exports on-off model and gives terminal J9 and I11,
Adjustment is carried out to the on-off model of intelligence instrument.
In order to realize the calibration function of analog quantity output signals, referring to Fig. 3, further include：Capacitance C23, resistance R29, code is pulled out
Switch B1, resistance R27, resistance R30, resistance R28 and analog-to-digital conversion module；The both ends of capacitance C23 respectively with the change of meters under test
Output end is sent to be electrically connected；The first end of capacitance C23 is electrically connected by the input terminal of resistance R29 and plucking number sign switch B1；Capacitance
The second end of C23 is electrically connected with the output end of plucking number sign switch B1；The first end electricity of the output end of plucking number sign switch B1 and resistance R27
Property connection；The second end of resistance R27 is electrically connected with the first end of resistance R28；The first end of resistance R30 is connected to resistance R27
Second end and the first end of resistance R28 between, the second end of resistance R30 is grounded；The second end of resistance R28 and analog-to-digital conversion mould
The signal input part of block is electrically connected；The signal output end of analog-to-digital conversion module and the signal input part of microcontroller are electrically connected.
The structure of the utility model embodiment is specifically described, further includes：Capacitance C26；The first end of capacitance C26 connects
It is connected between the second end of resistance R28 and the signal input part of analog-to-digital conversion module, the second end ground connection of capacitance C26.
Specifically, IN1 terminals and GND terminal access standard signal, and voltage signal is converted into through capacitance C23 and resistance R29,
Using the selector channels plucking number sign switch B1, by voltage divider circuit Resistance R27 and R30, using resistance R28 and capacitance C26 to mould
Number conversion module.Analog-to-digital conversion module outputs signal to microcontroller, and microcontroller receives signal and shows current measurement value.
In order to realize the calibration function of analog input signal, referring to Fig. 4, further include：Resistance R90, light idol U20, partial pressure
Circuit, amplifier, resistance R96, resistance R97, triode Q20, diode D40, diode D41 and connecting terminal OUT1；Resistance R90
First end and the signal output end of microcontroller be electrically connected, the negative electricity of the second end of resistance R90 and diode in light idol U20
Property connection；The anode connection power supply of diode in light idol U20；The signal output end of light idol U20 and the signal of bleeder circuit input
End is electrically connected；The signal output end of bleeder circuit and the signal input part of amplifier are electrically connected；The signal output end of amplifier with
The first end of resistance R97 is electrically connected；The second end of resistance R97 is electrically connected with the emitter of triode Q20；Resistance R96's
First end is connected between the second end of resistance R97 and the emitter of triode Q20, and the second end of resistance R96 connects power supply；Three
The base earth of pole pipe Q20, the collector of triode Q20 are connect with the anode of diode D40；The cathode of diode D40 and two
The cathode of pole pipe D41 is electrically connected；The plus earth of diode D41；The first end of connecting terminal OUT1 is connected to diode D40
Cathode and the cathode of diode D41 between, the second end of connecting terminal OUT1 and the analog input end of meters under test are electrical
Connection.
Specifically, microcontroller outputs signals to PWM0 terminals, and by resistance R90 to signal to light idol U20, light idol U20 is defeated
Go out signal to the bleeder circuit amplifier chip U21 being made of resistance R91, resistance R92 and resistance R93, the periphery of amplifier chip U21
Comparison circuit is made of capacitance C60, resistance R94, resistance R95, resistance R98 and capacitance C62, and output signal is through resistance R95, resistance
R97, triode Q20, protection diode D40 and D41 export 4-20mA signals and give OUT1 terminals.
In order to carry out current correction to instrument, further include：Current transformer, resistance R10 and the 2nd AD acquisition modules；
The signal input part of current transformer and the signal output end of meters under test are electrically connected；The both ends of resistance R10 and Current Mutual Inductance
The signal output end of device is electrically connected；The signal output end of current transformer and the signal input part of the 2nd AD acquisition modules are electrical
Connection；The signal output end of 2nd AD acquisition modules and the signal input part of microcontroller are electrically connected.
In order to carry out voltage correction to instrument, further include：Bleeder circuit, transformer, resistance R29 and the first AD acquisitions
Module；The signal input part of bleeder circuit and the signal output end of meters under test are electrically connected；The signal output end of bleeder circuit
It is electrically connected with the primary coil of transformer；The secondary coil of transformer and the signal input part of the first AD acquisition modules electrically connect
It connects；The signal output end of first AD acquisition modules and the signal input part of microcontroller are electrically connected；The both ends of resistance R29 and transformation
The both ends of the secondary coil of device are electrically connected.
In order to be shown to each adjustment data, further include：Presentation device；The signal input part and microcontroller of presentation device
Signal output end communication connection.
In the present embodiment, the STC12C5628AD that the model of microcontroller is produced by Jiangsu Guo Xin Science and Technology Ltd.s.
Presentation device is touch screen, and the power supply for its power supply is 24V power supplys.
By the adjustment circuit package being made of above-mentioned each component in the all-in-onecase with heat emission hole, and there are communications to connect
Mouthful, in order to be connect with meters under test, make when carrying out adjustment to the on-off model of instrument, analog signals, electric current, voltage
With.Presentation device is arranged on cabinet surface, in order to be shown to each adjustment data.
【Technique effect】
1, meters under test provides on-off model and protects circuit via resistance R31, capacitance C37, diode D29, gives signal
To the input terminal of light idol U13, light idol U13 outputs signal to microcontroller, and microcontroller acquires the signal to judge on-off model
Working condition enhances anti-interference ability to realize Phototube Coupling, thus solves poor anti jamming capability in the prior art
The technical issues of, realize the technique effect for improving adjustment accuracy.
2, by the application to presentation device, the display to each parameter is realized, discontinuity is automatically stored, and can basis
Demand exports data and prints archive.
The utility model embodiment can not only detect the relay output function and On-off signal function of intelligence instrument
It is whether normal, additionally it is possible to the analog input signal and analog quantity output signals of intelligence instrument to be corrected, while can also
The current signal and voltage signal of intelligence instrument are corrected, it is powerful, it is easy to operate easy to learn, coordinate display screen, it can
Intuitive display.The utility model embodiment can realize that the manufacture adjustment to intelligence instrument works.
Although the preferred embodiment of the utility model has been described, once a person skilled in the art knows basic
Creative concept, then additional changes and modifications may be made to these embodiments.It is wrapped so the following claims are intended to be interpreted as
It includes preferred embodiment and falls into all change and modification of the scope of the utility model.
Obviously, those skilled in the art can carry out the utility model various modification and variations without departing from this practicality
Novel spirit and scope.If in this way, these modifications and variations of the present invention belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to include these modifications and variations.
Claims (9)
1. a kind of calibration apparatus for instrument, which is characterized in that including：Resistance R31, capacitance C37, diode D29, light are even
U13 and microcontroller；The first end of the resistance R31 is electrically connected the on-off model output end of meters under test, the resistance R31
Second end in the light idol U13 diode anode connect；The cathode ground connection of diode in the light idol U13；The electricity
The first end for holding C37 is connected between the second end of the resistance R31 and the anode of diode in the light idol U13, the electricity
The second end for holding C37 and the cathode of diode in the light idol U13 are electrically connected；The anode of the diode D29 is connected to institute
It states between the second end of capacitance C37 and the cathode of diode in the light idol U13, the cathode of the diode D29 is connected to institute
It states between the first end of capacitance C37 and the anode of diode in the light idol U13；The signal output end of the light idol U13 and institute
The signal input part for stating microcontroller is electrically connected.
2. device as described in claim 1, which is characterized in that further include：Resistance R72, light idol U11, resistance R25, triode
Q5, diode D21, relay K3 and high tension protection circuit varistor RV4；The first end of the resistance R72 and the monolithic
The output end of machine is electrically connected, and the second end of the resistance R72 and the cathode of diode in the light idol U11 are electrically connected；Institute
The anode connection power supply of diode in light idol U11 is stated, the first end of the output end and the resistance R25 of the light idol U11 is electrical
Connection；The second end of the resistance R25 is connect with the base stage of the triode Q5；The emitter connection electricity of the triode Q5
Source, the collector of the triode Q5 and the cathode of the diode D21 are electrically connected；The plus earth of the diode D21；
The anode and first end and second end of the cathode also respectively with the relay K3 coil windings of the diode D21 electrically connects
It connects；The both ends of the high tension protection circuit varistor RV4 respectively with the first contact output end of the relay K3 and second
Contact output end is electrically connected；The the first contact output end and the second contact output end of the relay K3 and opening for meters under test
It measures input terminal and is electrically connected in pass.
3. device as described in claim 1, which is characterized in that further include：Capacitance C23, resistance R29, plucking number sign switch B1, resistance
R27, resistance R30, resistance R28 and analog-to-digital conversion module；The both ends of the capacitance C23 respectively with the pick-up output end of meters under test
It is electrically connected；The first end of the capacitance C23 is electrically connected by the input terminal of the resistance R29 and plucking number sign switch B1；
The second end of the capacitance C23 and the output end of the plucking number sign switch B1 are electrically connected；The output end of the plucking number sign switch B1 with
The first end of the resistance R27 is electrically connected；The second end of the resistance R27 and the first end of the resistance R28 are electrically connected；
The first end of the resistance R30 is connected between the second end of the resistance R27 and the first end of the resistance R28, the electricity
Hinder the second end ground connection of R30；The second end of the resistance R28 is electrically connected with the signal input part of the analog-to-digital conversion module；
The signal output end of the analog-to-digital conversion module and the signal input part of the microcontroller are electrically connected.
4. device as claimed in claim 3, which is characterized in that further include：Capacitance C26；The first end of the capacitance C26 connects
Between the second end and the signal input part of the analog-to-digital conversion module of the resistance R28, the second termination of the capacitance C26
Ground.
5. device as described in claim 1, which is characterized in that further include：Resistance R90, light idol U20, bleeder circuit, amplifier,
Resistance R96, resistance R97, triode Q20, diode D40, diode D41 and connecting terminal OUT1；The first of the resistance R90
End and the signal output end of the microcontroller are electrically connected, the second end of the resistance R90 and diode in the light idol U20
Cathode is electrically connected；The anode connection power supply of diode in the light idol U20；The signal output end of the light idol U20 with it is described
The signal input part of bleeder circuit is electrically connected；The signal input part electricity of the signal output end of the bleeder circuit and the amplifier
Property connection；The signal output end of the amplifier and the first end of the resistance R97 are electrically connected；The second end of the resistance R97
It is electrically connected with the emitter of the triode Q20；The first end of the resistance R96 is connected to the second end of the resistance R97
Between the emitter of the triode Q20, the second end of the resistance R96 connects power supply；The base stage of the triode Q20 connects
Ground, the collector of the triode Q20 are connect with the anode of the diode D40；The cathode of the diode D40 and described two
The cathode of pole pipe D41 is electrically connected；The plus earth of the diode D41；The first end of the connecting terminal OUT1 is connected to
Between the cathode of the diode D40 and the cathode of the diode D41, second end and the instrument to be measured of the connecting terminal OUT1
The analog input end of table is electrically connected.
6. device as described in claim 1, which is characterized in that further include：Current transformer, resistance R10 and the 2nd AD acquisitions
Module；The signal input part of the current transformer and the signal output end of meters under test are electrically connected；The two of the resistance R10
End and the signal output end of the current transformer are electrically connected；The signal output end of the current transformer and the 2nd AD
The signal input part of acquisition module is electrically connected；The signal of the signal output end and the microcontroller of the 2nd AD acquisition modules
Input terminal is electrically connected.
7. device as described in claim 1, which is characterized in that further include：Bleeder circuit, transformer, resistance R29 and the first AD
Acquisition module；The signal input part of the bleeder circuit and the signal output end of meters under test are electrically connected；The bleeder circuit
The primary coil of signal output end and the transformer be electrically connected；The secondary coil of the transformer is adopted with the first AD
The signal input part for collecting module is electrically connected；The signal of the signal output end and the microcontroller of the first AD acquisition modules is defeated
Enter end to be electrically connected；The both ends of the resistance R29 and the both ends of the secondary coil of the transformer are electrically connected.
8. the device as described in any one of claim 1-7, which is characterized in that further include：Presentation device；The presentation device
The signal output end of signal input part and the microcontroller communicate to connect.
9. the device as described in any one of claim 1-7, which is characterized in that the model of the microcontroller is by Jiangsu state core
The STC12C5628AD of Science and Technology Ltd.'s production.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820378720.5U CN207963924U (en) | 2018-03-20 | 2018-03-20 | A kind of calibration apparatus for instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820378720.5U CN207963924U (en) | 2018-03-20 | 2018-03-20 | A kind of calibration apparatus for instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207963924U true CN207963924U (en) | 2018-10-12 |
Family
ID=63725805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820378720.5U Expired - Fee Related CN207963924U (en) | 2018-03-20 | 2018-03-20 | A kind of calibration apparatus for instrument |
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| Country | Link |
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| CN (1) | CN207963924U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112510665A (en) * | 2020-09-23 | 2021-03-16 | 科大智能电气技术有限公司 | Switching value EMS protection circuit |
-
2018
- 2018-03-20 CN CN201820378720.5U patent/CN207963924U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112510665A (en) * | 2020-09-23 | 2021-03-16 | 科大智能电气技术有限公司 | Switching value EMS protection circuit |
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