CN107219401A - Resistance detects circuit and resistance detection device - Google Patents
Resistance detects circuit and resistance detection device Download PDFInfo
- Publication number
- CN107219401A CN107219401A CN201710619324.7A CN201710619324A CN107219401A CN 107219401 A CN107219401 A CN 107219401A CN 201710619324 A CN201710619324 A CN 201710619324A CN 107219401 A CN107219401 A CN 107219401A
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- Prior art keywords
- resistance
- circuit
- input
- output end
- control circuit
- 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.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
Abstract
The embodiment of the present invention provides a kind of resistance detection circuit and resistance detection device, resistance detection circuit includes oscillating circuit, signal shaper, control circuit and warning circuit, the input of oscillating circuit is connected with testing resistance, the input of output end and signal shaper is connected, and controls the input of output end connection, output end and the warning circuit of the input and signal shaper of circuit to connect.Oscillating circuit is used to gather the resistance of testing resistance and is converted to frequency signal input signal reshaper, signal shaper is used to carry out input control circuit after Shape correction to frequency signal, control circuit is used to the frequency signal after shaping is handled to obtain the resistance of testing resistance, and resistance is compared with preset reference value, control warning circuit to be alarmed according to comparison result.The present invention can realize the measurement of the resistance to different Standard resistance ranges, and circuit structure is simple, and testing efficiency is high.
Description
Technical field
The present invention relates to electronic equipment detection technique field, detect that circuit and resistance are examined in particular to a kind of resistance
Measurement equipment.
Background technology
, it is necessary to survey tester etc. using digital multimeter, micro- resistance in electronic equipment production, detection and test process
The conduction test between certain 2 points in measurement electronic equipment is completed, but in actual measurement process, the honeybee in digital multimeter
The turn-on threshold resistance of ring shelves is generally the Ω of 70 Ω~100, it is impossible to realize that resistance value is less than the test of 70 Ω miniature resistance, and
Miniature resistance value is tested although micro- resistance meter can be realized, measuring speed is slower, it is impossible to quickly realize to electricity
The performance of sub- equipment judges.
The content of the invention
In view of this, the present invention provides a kind of resistance detection circuit and resistance detection device, by detecting electricity to the resistance
The ingehious design on road, can realize the conduction measurement to the resistance of different Standard resistance ranges, and testing efficiency is high.
Present pre-ferred embodiments provide a kind of resistance detection circuit, including oscillating circuit, signal shaper, control circuit
And warning circuit；
The input of the oscillating circuit is connected with testing resistance, output end and the input of the signal shaper connect
Connect, it is described control circuit input be connected with the output end of the signal shaper, output end it is defeated with the warning circuit
Enter end connection；
The oscillating circuit is whole for gathering the resistance of the testing resistance and being converted to the frequency signal input signal
Shape device, the signal shaper is used to input the control circuit, the control after carrying out Shape correction to the frequency signal
Circuit is used to handle the frequency signal after shaping to obtain the resistance of the testing resistance, and by the resistance and
Preset reference value is compared, and controls the warning circuit to be alarmed according to comparison result.
In the selection of present pre-ferred embodiments, the oscillating circuit includes first resistor collection terminal, second resistance and adopted
Collect end, electric capacity and phase inverter；
The first resistor collection terminal and the second resistance collection terminal are connected with the testing resistance respectively, described anti-phase
The input of device is connected respectively with the input and the first resistor collection terminal of the electric capacity, output end and the signal shaping
The input of device and the second resistance collection terminal are connected respectively, the output head grounding of the electric capacity.
In the selection of present pre-ferred embodiments, the control circuit includes reference circuit and single-chip microcomputer；
The output end of the signal shaper is connected with the frequency signal collection terminal of the single-chip microcomputer, the reference circuit
Output end is connected with the voltage acquisition end of the single-chip microcomputer, and the warning circuit is connected with the output end of the single-chip microcomputer.
In the selection of present pre-ferred embodiments, the reference circuit includes first resistor and adjustable resistance；
The voltage acquisition end of the input external power supply of the first resistor, output end and the single-chip microcomputer and described adjustable
The input of resistance is connected respectively, the output head grounding of the adjustable resistance.
In the selection of present pre-ferred embodiments, the warning circuit includes buzzer alarm circuit, the buzzing alarm
Circuit includes second resistance, triode and buzzer；
The two ends of the second resistance connect with the first output end of the control circuit and the base stage of the triode respectively
Connect, and the colelctor electrode of the triode is connected with the buzzer, grounded emitter.
In the selection of present pre-ferred embodiments, the warning circuit also includes luminous alarm circuit, the luminous report
Alert circuit includes 3rd resistor and light emitting diode；
The two ends of the 3rd resistor respectively with it is described control circuit the second output end and the light emitting diode it is defeated
Enter end connection.
In the selection of present pre-ferred embodiments, the luminous alarm circuit also includes the 4th resistance, the 4th electricity
One end of resistance is connected with the output end of the light emitting diode, the other end and external power supply end.
In the selection of present pre-ferred embodiments, the signal shaper is phase inverter.
In the selection of present pre-ferred embodiments, the resistance detection circuit also includes display module, the display mould
Block is connected to show the resistance, preset reference value and comparison result with the 3rd output end of the control circuit.
Present pre-ferred embodiments also provide a kind of resistance detection device, the resistance detection device include power supply module and
Above-mentioned resistance detection circuit, the power supply module detects that the control circuit in circuit is connected to provide work for it with the resistance
Make electric energy.
Resistance test circuit and resistance test equipment provided in an embodiment of the present invention, wherein, by testing electricity to the resistance
The ingehious design on road, can be applicable the resistance measurement of different range, and simple in construction, easy to use, and testing efficiency is high.
Brief description of the drawings
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment only
It is a part of embodiment of the present invention, rather than whole embodiments.The present invention being generally described and illustrated herein in the accompanying drawings
The component of embodiment can be arranged and designed with a variety of configurations.
Therefore, the detailed description of embodiments of the invention below to providing in the accompanying drawings is not intended to limit claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.Based on the embodiment in the present invention, this area is common
The every other embodiment that technical staff is obtained under the premise of creative work is not made, belongs to the model that the present invention is protected
Enclose.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it further need not be defined and explained in subsequent accompanying drawing.In description of the invention
In, term " first, second, third, fourth etc. is only used for distinguishing description, and it is not intended that being or hint relative importance.
In the description of the invention, unless otherwise clearly defined and limited, term " setting ", " connected ", " connection " are answered
It is interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or is integrally connected；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected to by intermediary, can be in two elements
The connection in portion.For the ordinary skill in the art, the tool of above-mentioned term in the present invention can be understood with concrete condition
Body implication.
Fig. 1 is the frame structure schematic diagram that resistance provided in an embodiment of the present invention detects circuit.
Fig. 2 is the structural representation of the oscillating circuit shown in Fig. 1.
Fig. 3 is the structural representation of the control circuit shown in Fig. 1.
Fig. 4 is the structural representation of the warning circuit shown in Fig. 1.
Fig. 5 is another structural representation that resistance provided in an embodiment of the present invention detects circuit.
Fig. 6 is the frame structure schematic diagram of resistance detection device provided in an embodiment of the present invention.
Icon：10- resistance detection devices；20- resistances detect circuit；200- oscillating circuits；2000- first resistors are gathered
End；2002- second resistance collection terminals；2004- phase inverters；2006- electric capacity；210- signal shapers；220- controls circuit；222-
Reference circuit；2220- first resistors；2222- adjustable resistances；224- single-chip microcomputers；230- warning circuits；232- buzzings alarm electricity
Road；2320- second resistances；2322- triodes；2324- buzzers；234- luminous alarm circuits；2340- 3rd resistors；2342-
Light emitting diode；The resistance of 2344- the 4th；30- power supply modules.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.The present invention implementation being generally described and illustrated herein in the accompanying drawings
The component of example can be arranged and designed with a variety of configurations.
Therefore, the detailed description of embodiments of the invention below to providing in the accompanying drawings is not intended to limit claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.Based on the embodiment in the present invention, this area is common
The every other embodiment that technical staff is obtained under the premise of creative work is not made, belongs to the model that the present invention is protected
Enclose.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it further need not be defined and explained in subsequent accompanying drawing.
As shown in figure 1, for a kind of resistance detection circuit 20 provided in an embodiment of the present invention, resistance detection circuit 20 includes
Oscillating circuit 200, signal shaper 210, control circuit 220 and warning circuit 230；The input of the oscillating circuit 200 with
Testing resistance connection, output end be connected with the input of the signal shaper 210, it is described control circuit 220 input and
The output end connection of the signal shaper 210, output end are connected with the input of the warning circuit 230.
Wherein, the oscillating circuit 200 is used to gather the resistance of the testing resistance and is converted to frequency signal input institute
Signal shaper 210 is stated, the signal shaper 210 is used to input the control after carrying out Shape correction to the frequency signal
Circuit 220, the control circuit 220 is used to the frequency signal after shaping is handled to obtain the testing resistance
Resistance, and the resistance and preset reference value are compared, control the warning circuit 230 to be reported according to comparison result
It is alert.
Specifically, as shown in Fig. 2 the oscillating circuit 200 includes first resistor collection terminal 2000, second resistance collection terminal
2002nd, electric capacity 2006 and phase inverter 2004；The first resistor collection terminal 2000 and the second resistance collection terminal 2002 are distinguished
It is connected with the testing resistance, the input and the first resistor of the input of the phase inverter 2004 and the electric capacity 2006
Collection terminal 2000 is connected respectively, the input and the second resistance collection terminal 2002 of output end and the signal shaper 210
Connect respectively, the output head grounding of the electric capacity 2006.
According to the actual requirements, the phase inverter 2004, the testing resistance and the electric capacity 2006 are in resistance measurement event
In collectively form an oscillator, the resistance of measurement is changed to form corresponding frequency signal and by the phase inverter 2004
Output to the control circuit 220, the frequency signal can be square-wave signal, triangular signal etc..The signal shaper
210 pairs of frequency signals received carry out Shape correction.
Alternatively, the phase inverter 2004 may be, but not limited to, schmitt inverter.In addition, in the present embodiment, it is described
Signal shaper 210 is also realized using phase inverter, such as schmitt inverter.In other words, the phase inverter 2004 with it is described
Signal shaper 210 can use the component of same type, or different type.In addition, the signal shaper
210 can also use the shaping circuit being made up of multiple components to realize.
Further, the control circuit 220 is used to judge the resistance collected and driven according to judged result
The corresponding warning circuit 230 is alarmed.Wherein, due in actual implementation process, different testing resistance or electronics
The Standard resistance range of equipment is different, therefore can adjust preset reference value to match difference by the flexible adjustment of reference circuit 222
Testing resistance or electronic equipment.Wherein, as shown in figure 3, the control circuit 220 includes reference circuit 222 and single-chip microcomputer
224, the output end of the signal shaper 210 is connected with the frequency signal collection terminal of the single-chip microcomputer 224, the reference circuit
222 output end is connected with the voltage acquisition end of the single-chip microcomputer 224, and the warning circuit 230 is defeated with the single-chip microcomputer 224
Go out end connection.
It should be noted that the reference circuit 222 can be integrated in the single-chip microcomputer 224, or individually electricity
Road module.For example, in the present embodiment, the reference circuit 222 includes first resistor 2220 and adjustable resistance 2222, wherein, institute
State the voltage acquisition end and the adjustable electric of the input external power supply, output end of first resistor 2220 with the single-chip microcomputer 224
The input of resistance 2222 is connected respectively, the output head grounding of the adjustable resistance 2222.During actual implementation, the first resistor
2220 be fixed resistance, can external 5V power supplys V1, by adjusting the resistance of the adjustable resistance 2222 with change it is described first electricity
Magnitude of voltage in resistance 2220, and then obtain different preset reference values.Alternatively, the Standard resistance range of the reference circuit 222 can
To be set as the Ω of 1 Ω~100.
Further, the single-chip microcomputer 224 is provided with multiple ports, wherein, the frequency signal collection terminal is used for institute
The frequency signal for stating the process shaping of the input of signal shaper 210 is counted, and then count results are handled to change
Into resistance corresponding with the testing resistance, meanwhile, the voltage acquisition end on the single-chip microcomputer 224 is used to gather through described adjustable
The magnitude of voltage in the first resistor 2220 after the partial pressure of resistance 2222, and the magnitude of voltage is handled to obtain preset reference
Value, and the resistance for going back testing resistance of the preset reference value with being obtained after processing is compared, according to comparison result control
Warning circuit 230 is alarmed.
Alternatively, the concrete model of the single-chip microcomputer 224 is not limited to the model provided in Fig. 3, in other words, the single-chip microcomputer
224 concrete model can carry out flexible design according to the actual requirements, and the present embodiment is without limitation.
Further, the warning circuit 230 is used to be reported according to the control signal that the control circuit 220 is sent
Alert, if for example, the preset reference value is more than the resistance of the testing resistance, the warning circuit 230 sends first and alarmed
Signal；If conversely, the preset reference value is less than the resistance of the testing resistance, the warning circuit 230 sends second and alarmed
Signal etc., so that staff can quickly distinguish the resistance information of the testing resistance according to different alarm signals.
In the present embodiment, as shown in figure 4, the warning circuit 230 includes buzzer alarm circuit 232, the buzzing alarm
Circuit 232 includes second resistance 2320, triode 2322 and buzzer 2324；Wherein, the two ends of the second resistance 2320 point
It is not connected with the first output end of the control circuit 220 and the base stage of the triode 2322, and the triode 2322
Colelctor electrode is connected with the buzzer 2324, grounded emitter.During actual implementation, reported when the buzzer alarm circuit 232 is met
During alert condition, the buzzer 2324 turns on and sends buzzerphone to be alarmed.
Further, the warning circuit 230 also includes luminous alarm circuit 234, and the luminous alarm circuit 234 includes
3rd resistor 2340 and light emitting diode 2342；The two ends of the 3rd resistor 2340 respectively with the control circuit 220 the
The input connection of two output ends and the light emitting diode 2342.During actual implementation, when the luminous alarm circuit 234 is met
During alert if, the light emitting diode 2342 turns on and lighted to be alarmed.
It should be understood that the buzzer alarm circuit 232 and the luminous alarm circuit 234 be able to can also be gone here and there with separate
The form connection of connection.For example, in the present embodiment, when the testing resistance value is less than the preset reference value, the luminous report
Alert circuit 234 is turned on and alarmed by optical signal, conversely, the single-chip microcomputer 224 first drives the buzzer alarm circuit 232
Conducting, then drives the luminous alarm circuit 234 to turn on again, is reported so that the two sends sound and light alarm signal simultaneously
It is alert.
Alternatively, the luminous alarm circuit 234 also include the 4th resistance 2344, one end of the 4th resistance 2344 with
Output end connection, the other end and the external power supply end of the light emitting diode 2342.
According to the actual requirements, in order to further improve the practicality that the resistance detects circuit 20, while convenient in resistance
The resistance of the testing resistance is monitored in measurement process, resistance detection circuit 20 also includes display module, the display module
It is connected to show the resistance, preset reference value and comparison result with the 3rd output end of the control circuit 220.
Alternatively, the display module can be only for the LED display or can carry out man-machine that result shows
Interactive touching display screen etc., specifically, this implementation is not restricted to this.
Based on the description that circuit 20 is detected to above-mentioned resistance, the work of circuit 20 is detected to the resistance below in conjunction with Fig. 5
Make principle simply to be introduced.
(1) some part in the testing resistance for needing to carry out conduction test, such as electronic equipment is determined first.
(2) the first resistor collection terminal 2000 and the second resistance collection terminal 2002 are connected respectively
PA17025355WH is connected on the two ends of the testing resistance, to gather described to be measured by the oscillating circuit 200
The resistance of resistance is simultaneously exported to the signal shaper 210 in the form of frequency signal.
(3) list that the frequency signal is sent into after the Shape correction of signal shaper 210 in the control circuit 220
Piece machine 224, the frequency signal after described 224 pairs of shapings of single-chip microcomputer is counted, handles to obtain the testing resistance
Resistance, meanwhile, the single-chip microcomputer 224 gathers the voltage in the first resistor 2220 on the reference circuit 222 and handles to obtain
To preset reference value.
(4) resistance of the testing resistance is compared the single-chip microcomputer 224 with the preset reference value, according to comparison
The buzzer alarm circuit 232 or/and the luminous alarm circuit 234 in warning circuit 230 described in output control are reported
It is alert.Meanwhile, the display module is shown to measurement result and comparing result etc..
It is powered it should be noted that V1, V2, V3 and V4 shown in Fig. 5 can select 5V power supplys.
As shown in fig. 6, the present embodiment also provides a kind of resistance detection device 10, the resistance detection device 10 includes power supply
Module 30 and above-mentioned resistance detection circuit 20, the power supply module 30 detect the control circuit in circuit 20 with the resistance
220 connect to provide work energy for it.
Alternatively, the power supply module 30 can be direct current supply module or Alternating Current Power Supply module etc., specifically, the power supply
Module 30 can according to actual conditions carry out flexible design.
In summary, the present invention is provided resistance detection circuit 20 and resistance detection device 10, by being detected to the resistance
The ingehious design of circuit 20, can quickly and accurately measure the resistance of testing resistance, it is to avoid electronic equipment etc. is in practical application mistake
Occur in journey due to equipment fault or security hidden trouble caused by short circuit phenomenon etc..Meanwhile, resistance detection circuit 20 makes
It is practical with convenient, simple in construction.
Obviously, those skilled in the art should be understood that the function of the above-mentioned embodiment of the present invention can use general meter
Calculate device to realize, they can be concentrated on single computing device, or are distributed in the net that multiple computing devices are constituted
On network, alternatively, the existing program code or algorithm that they can be can perform with computing device be realized, it is thus possible to by it
Store and performed in the storage device by computing device, either they are fabricated to respectively each integrated circuit modules or
Multiple modules or step in them are fabricated to single integrated circuit module to realize.So, functions implementing the present invention are not
Any specific hardware and software is limited to combine.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
1. a kind of resistance detects circuit, it is characterised in that including oscillating circuit, signal shaper, control circuit and warning circuit；
The input of the oscillating circuit is connected with testing resistance, output end is connected with the input of the signal shaper, institute
The input for stating control circuit be connected with the output end of the signal shaper, the input company of output end and the warning circuit
Connect；
The oscillating circuit is used to gather the resistance of the testing resistance and be converted to frequency signal to input the signal shaper,
The signal shaper is used to the frequency signal is carried out to input the control circuit after Shape correction, and the control circuit is used
In being handled the frequency signal after shaping to obtain the resistance of the testing resistance, and by the resistance and default base
Quasi- value is compared, and controls the warning circuit to be alarmed according to comparison result.
2. resistance according to claim 1 detects circuit, it is characterised in that the oscillating circuit is gathered including first resistor
End, second resistance collection terminal, electric capacity and phase inverter；
The first resistor collection terminal and the second resistance collection terminal are connected with the testing resistance respectively, the phase inverter
Input is connected respectively with the input and the first resistor collection terminal of the electric capacity, output end and the signal shaper
Input and the second resistance collection terminal are connected respectively, the output head grounding of the electric capacity.
3. resistance according to claim 1 detects circuit, it is characterised in that the control circuit includes reference circuit and list
Piece machine；
The output end of the signal shaper is connected with the frequency signal collection terminal of the single-chip microcomputer, the output of the reference circuit
End is connected with the voltage acquisition end of the single-chip microcomputer, and the warning circuit is connected with the output end of the single-chip microcomputer.
4. resistance according to claim 3 detects circuit, it is characterised in that the reference circuit includes first resistor and can
Adjust resistance；
Voltage acquisition end and the adjustable resistance of the input external power supply, output end of the first resistor with the single-chip microcomputer
Input connect respectively, the output head grounding of the adjustable resistance.
5. resistance according to claim 1 detects circuit, it is characterised in that the warning circuit includes buzzing and alarms electric
Road, the buzzer alarm circuit includes second resistance, triode and buzzer；
The two ends of the second resistance are connected with the first output end of the control circuit and the base stage of the triode respectively, and
The colelctor electrode of the triode is connected with the buzzer, grounded emitter.
6. the resistance detection circuit according to any one of claim 1 or 5, it is characterised in that the warning circuit is also wrapped
Luminous alarm circuit is included, the luminous alarm circuit includes 3rd resistor and light emitting diode；
The second output end and the input of the light emitting diode of the two ends of the 3rd resistor respectively with the control circuit
Connection.
7. resistance according to claim 6 detects circuit, it is characterised in that the luminous alarm circuit also includes the 4th electricity
Resistance, one end of the 4th resistance is connected with the output end of the light emitting diode, the other end and external power supply end.
8. resistance according to claim 1 detects circuit, it is characterised in that the signal shaper is phase inverter.
9. resistance according to claim 1 detects circuit, it is characterised in that the resistance detection circuit also includes display mould
Block, the display module be connected with the 3rd output end of the control circuit for the display resistance, preset reference value and
Comparison result.
10. a kind of resistance detection device, it is characterised in that the resistance detection device includes power supply module and the claims
Resistance detection circuit any one of 1-9, the power supply module detects that the control circuit in circuit is connected with the resistance
To provide work energy for it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710619324.7A CN107219401A (en) | 2017-07-26 | 2017-07-26 | Resistance detects circuit and resistance detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710619324.7A CN107219401A (en) | 2017-07-26 | 2017-07-26 | Resistance detects circuit and resistance detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107219401A true CN107219401A (en) | 2017-09-29 |
Family
ID=59953922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710619324.7A Pending CN107219401A (en) | 2017-07-26 | 2017-07-26 | Resistance detects circuit and resistance detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107219401A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1064948A (en) * | 1992-04-18 | 1992-09-30 | 南京建筑工程学院 | Multifunction insulating monitor |
| CN204302389U (en) * | 2014-12-17 | 2015-04-29 | 武汉大学 | A kind of electric power components and parts measuring instrument |
| CN104898001A (en) * | 2013-08-08 | 2015-09-09 | 江苏理工学院 | Duplex potentiometer total resistance, zero resistance and motive noise detector |
-
2017
- 2017-07-26 CN CN201710619324.7A patent/CN107219401A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1064948A (en) * | 1992-04-18 | 1992-09-30 | 南京建筑工程学院 | Multifunction insulating monitor |
| CN104898001A (en) * | 2013-08-08 | 2015-09-09 | 江苏理工学院 | Duplex potentiometer total resistance, zero resistance and motive noise detector |
| CN204302389U (en) * | 2014-12-17 | 2015-04-29 | 武汉大学 | A kind of electric power components and parts measuring instrument |
Non-Patent Citations (2)
| Title |
|---|
| 刘韶轩等: "《51单片机逆向学习实战教程》", 31 July 2016 * |
| 李月乔等: "《数字电子技术基础》", 31 January 2014 * |
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Application publication date: 20170929 |