CN110208590A - A kind of voice prompting protection circuit preventing maloperation damage digital multimeter - Google Patents
A kind of voice prompting protection circuit preventing maloperation damage digital multimeter Download PDFInfo
- Publication number
- CN110208590A CN110208590A CN201910465840.8A CN201910465840A CN110208590A CN 110208590 A CN110208590 A CN 110208590A CN 201910465840 A CN201910465840 A CN 201910465840A CN 110208590 A CN110208590 A CN 110208590A
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- China
- Prior art keywords
- digital multimeter
- jack
- position sensor
- gear position
- voice prompting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/12—Circuits for multi-testers, i.e. multimeters, e.g. for measuring voltage, current, or impedance at will
- G01R15/125—Circuits for multi-testers, i.e. multimeters, e.g. for measuring voltage, current, or impedance at will for digital multimeters
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
A kind of voice prompting protection circuit preventing maloperation damage digital multimeter, for preventing maloperation from damaging digital multimeter.Protecting circuit includes 4 jacks, the loudspeakers such as 5 gear position sensors such as intelligent voice prompt chip, armature contact, resistance, V/ Ω etc..Intelligent voice prompt chip includes microprocessor, can carry out logic analysis to input signal, export corresponding voice prompting signal and control signal.Move contacts it is coaxial with the driver plate of digital multimeter, can synchronous with driver plate connection protect each function gear position sensor in circuit.Protect each function gear position sensor in circuit that can export logic high when being connected by armature contact.It protects and contains microswitch circuit inside each jack of circuit, when there is the insertion of test pencil plug, logic high can be exported.Using the digital multimeter of present invention protection circuit, it can effectively prevent damaging multimeter with the maloperations such as current gear or other grades of survey voltage, be spaced apart the accidents such as tripping, personal injury, extend multimeter service life.
Description
Technical field
The invention belongs to electronic measuring instrument fields, and in particular to a kind of voice for preventing maloperation damage digital multimeter
Prompt protection circuit.
Background technique
Although each functional measurement gear all designs and has protection circuit existing digital multimeter, but when user of service's electricity consumption occurs
It when flowing the maloperations such as shelves or other grades of survey voltage, still will cause: the peripheral cell (such as cartridge fuse) of 1. digital multimeter, internal member
Part (such as overvoltage protection diode, shunt resistance, integrated circuit) damages and influences normal use；2. cause interior always to open tripping,
Large-area power-cuts is caused, the normal use of other electrical equipments is influenced；3. test pencil is struck sparks, the vehement hand or eyes for hurting operator,
It causes personal injury accidents.Therefore, digital multimeter needs a kind of protection circuit for preventing maloperation.
Summary of the invention
A kind of voice prompting protection circuit preventing maloperation damage digital multimeter, for preventing maloperation damage number
Multimeter.Protection circuit include intelligent voice prompt chip, armature contact, resistance gear position sensor, low-voltage gear position sensor,
High voltage gear position sensor, low current gear position sensor, high current gear position sensor, V/ Ω jack, COM jack, mA jack,
20A jack, loudspeaker etc..
When the power switch for pressing digital multimeter, protect circuit that can detect jack and the driver plate choosing of test pencil insertion automatically
Whether function gear corresponds to.If corresponding, the voice prompting content of circuit and movement control is protected to be shown in Table 1；If not corresponding to, protection electricity
The voice prompting content on road and movement control are shown in Table 2.
Digital multimeter using present invention protection circuit can effectively prevent as long as being operated according to voice prompting content
Multimeter only is damaged with the maloperations such as current gear or other grades of survey voltage, is spaced apart the accidents such as tripping, personal injury, extends ten thousand
With table service life, it can also form after operator measures every time, red test pencil plug is inserted into V/ Ω jack, driver plate is dialled
To the good habit of voltage highest range shelves, such as table 1, table 2:
The jack of 1 test pencil of table insertion and function gear that driver plate select to it is corresponding when protect the voice prompting content of circuit and act pair
According to table
| Red test pencil is inserted The jack entered | Black meter pen is inserted The jack entered | What driver plate was selected Function gear | Voice prompting content | It is correctly grasped according to voice prompting Movement when making | It detects and is surveying Movement when amount | Movement when detecting etc. to be measured |
| V/Ω | COM | Low-voltage (200mV or less) | You will enter low-voltage and measure, and suitable range please be selected, if not knowing measured voltage Size please select 200mV grades to start to measure, then gradually decrease range, Zhi Daohe Until suitable, it is noted that measurement, which finishes, please pushes voltage highest range shelves for driver plate. | Protection circuit is failure to actuate, and makes to count Word multimeter is in high voltage Shelves wait measuring state. | Stop voice prompting | Continue voice prompting, after repeating 6 times, will touch Automatic shutdown circuitry is sent out, multimeter is entered " suspend mode " state, liquid crystal blank screen. |
| V/Ω | COM | High voltage (200mV or more) | You will enter high voltage measuring, suitable range please be selected, if not knowing measured voltage Size please select highest range to start to measure, then gradually decrease range, until Until suitable.Measurement finishes, and driver plate is please pushed voltage highest range shelves. | Protection circuit is failure to actuate, and makes to count Word multimeter is in high voltage Shelves wait measuring state. | Stop voice prompting | Continue voice prompting, after repeating 6 times, will stop Only voice prompting.Remain waiting for measurement shape State. |
| V/Ω | COM | Resistance | You will enter resistance measurement, please select suitable range, measured resistance is big if not knowing It is small, highest range please be select to start to measure, then gradually decrease range, Zhi Daohe Until suitable.It note that measurement finishes, driver plate please pushed into voltage highest range shelves. | Protection circuit is failure to actuate, and makes to count Word multimeter is in high voltage Shelves wait measuring state. | Stop voice prompting | Continue voice prompting, after repeating 6 times, will touch Automatic shutdown circuitry is sent out, multimeter is entered " suspend mode " state, liquid crystal blank screen. |
| mA | COM | Low current (200mA or less) | You will enter small current measurement, please select suitable range, if not knowing tested electric current Size please select 200mA grades to start to measure, then gradually decrease range, Zhi Daohe Until suitable.It note that measurement finishes, driver plate please pushed into voltage highest range shelves, Red test pencil is inserted into V/ Ω jack. | Protection circuit is failure to actuate, and makes to count Word multimeter is in high voltage Shelves wait measuring state. | Stop voice prompting | Continue voice prompting, after repeating 6 times, will touch Automatic shutdown circuitry is sent out, multimeter is entered " suspend mode " state, liquid crystal blank screen. |
| 20A | COM | High current (200mA or more) | You will enter Super-Current Measurement, please select suitable range, if not knowing tested electric current Size please select 20A grades to start to measure, range then be gradually decreased, until suitable Until.It note that measurement finishes, driver plate please pushed into voltage highest range shelves, it is red Test pencil is inserted into V/ Ω jack. | Protection circuit is failure to actuate, and makes to count Word multimeter is in high voltage Shelves wait measuring state. | Stop voice prompting | Continue voice prompting, after repeating 6 times, will touch Automatic shutdown circuitry is sent out, multimeter is entered " suspend mode " state, liquid crystal blank screen. |
The jack of 2 test pencil of table insertion and function gear that driver plate selects not to it is corresponding when protection circuit voice prompting content and movement
The table of comparisons
Detailed description of the invention
Fig. 1 is that circuit is protected to be mounted on the structural schematic diagram in digital multimeter；
Fig. 2 is that protection circuit theory constitutes block diagram.
Specific embodiment
Referring to Fig. 1,2, circuit 1 is protected to be mounted in digital multimeter 2, with 2 common-battery source of digital multimeter.Wherein, it protects
Circuit 1 includes intelligent voice prompt chip 3, armature contact 5, resistance gear position sensor 6, low-voltage gear position sensor 7, high voltage
Gear position sensor 8, low current gear position sensor 9, high current gear position sensor 10, V/ Ω jack 11, COM jack 12, mA jack
13,20A jack 14, loudspeaker 15 etc..Intelligent voice prompt chip 3 includes microprocessor, can carry out logic point to input signal
Analysis exports corresponding voice prompting signal and control signal.Armature contact is 5 coaxial with the driver plate 4 of digital multimeter 2, can with group
Disk 4 is synchronous to connect each function gear position sensor in protection circuit.Each function gear position sensor, which is worked as, in protection circuit 1 is moved contacts
When 5 connection, logic high can be exported.V/ Ω jack 11, COM jack 12, mA jack 13,20A jack 14 are mounted in digital versatile
On the panel of table 2, microswitch circuit is contained inside each jack, when there is the insertion of test pencil plug, logic high can be exported.
In measurement, the power switch 17 of digital multimeter 2 is pressed, protection circuit 1 is started to work, intelligent voice prompt core
Piece 3 will be passed according to V/ Ω jack 11, COM jack 12, mA jack 13,20A jack 14, resistance gear position sensor 6, low-voltage gear
The devices such as sensor 7, high voltage gear position sensor 8, low current gear position sensor 9, high current gear position sensor 10 export to it
Logic level signal is analyzed, and judges the jack of test pencil plug insertion and the dialling for digital multimeter 2 of digital multimeter 2
Whether the selected function gear of disk 4 corresponds to.1, if corresponding, intelligent voice prompt chip 3 will be by 1 voice prompting content output phase of table
Speech signal is answered, 15 sounding of drive the speaker reminds operator, and measurement finishes, red test pencil plug should be inserted into V/ Ω jack 11,
Driver plate 4 is allocated to voltage highest range shelves, if operator does not press above-mentioned requirements execution, while intelligent voice prompt chip 3 passes through
Its input port 21 detects that digital multimeter is in state to be measured, voice prompting again from the A/D converter 18 of digital multimeter 2
After repeating 6 times, intelligent voice prompt chip 3 will trigger the automatic shutdown circuitry 19 of digital multimeter 2 by its delivery outlet 20, make
Digital multimeter 2 enters " suspend mode " state, and 16 blank screen of liquid crystal, realize protection circuit 1 prevents maloperation from damaging with voice prompting
The function of bad digital multimeter.2, if not corresponding to, intelligent voice prompt chip 3 will answer language by 2 voice prompting content output phase of table
Sound signal, 15 sounding of drive the speaker.After voice prompting repeats 6 times, intelligent voice prompt chip 3 detects that test pencil plug is inserted into
The function gear selected of jack and 2 driver plate 4 of digital multimeter still not to it is corresponding when will pass through its delivery outlet 20 triggering digital versatile
The automatic shutdown circuitry 19 of table 2, makes digital multimeter enter " suspend mode " state, and 16 blank screen of liquid crystal realizes protection circuit 1 and uses
Voice prompting prevents the function of maloperation damage digital multimeter.To restore normal measurement, digital versatile twice need to be only pressed
The power switch 17 of table 2.
Claims (2)
1. a kind of voice prompting protection circuit (1) for preventing maloperation damage digital multimeter, is mounted in digital multimeter, with
Digital multimeter common-battery source, for preventing maloperation from damaging digital multimeter (2), which is characterized in that one kind prevents maloperation from damaging
Voice prompting protection circuit (1) of bad digital multimeter includes intelligent voice prompt chip (3), armature contact (5), resistance gear
Sensor (6), low-voltage gear position sensor (7), high voltage gear position sensor (8), low current gear position sensor (9), high current
Gear position sensor (10), V/ Ω jack (11), COM jack (12), mA jack (13), 20A jack (14), loudspeaker (15), intelligence
Energy voice prompting chip (3) includes microprocessor, for carrying out logic analysis to input signal, exports corresponding voice prompting letter
Number and control signal, the driver plate (4) of armature contact (5) and digital multimeter (2) coaxially, can each function of connection synchronous with driver plate (4)
Energy gear position sensor, when resistance gear position sensor (6), low-voltage gear position sensor (7), high voltage gear sensing in protection circuit
When device (8), low current gear position sensor (9) or high current gear position sensor (10) and armature contact (5) are connected, logic can be exported
High level, V/ Ω jack (11), COM jack (12), mA jack (13), 20A jack (14) are mounted in the panel of digital multimeter (2)
On, microswitch circuit is contained inside each jack, when there is the insertion of test pencil plug, logic high can be exported.
2. a kind of voice prompting protection circuit (1) for preventing maloperation damage digital multimeter according to claim 1,
It is characterized in that, in measurement, presses the power switch of digital multimeter, protection circuit is started to work, intelligent voice prompt chip
It will be according to V/ Ω jack, COM jack, mA jack, 20A jack, resistance gear position sensor, low-voltage gear position sensor, high voltage
Gear position sensor, low current gear position sensor, high current gear position sensor are exported to its logic level signal, are analyzed,
Whether the function gear for judging that the jack of the test pencil plug insertion of digital multimeter is selected with the driver plate of digital multimeter is corresponding；
If corresponding, intelligent voice prompt chip will answer speech signal by 1 voice prompting content output phase of table, and drive the speaker sounding mentions
Wake up operator, and measurement finishes, and red test pencil plug should be inserted into V/ Ω jack, driver plate is allocated to voltage highest range shelves, if operator
It is not executed by above-mentioned requirements, while intelligent voice prompt chip is examined by its input port from the A/D converter of digital multimeter
It measures digital multimeter and is in state to be measured again, after voice prompting repeats 6 times, intelligent voice prompt chip will be exported by it
The automatic shutdown circuitry of mouth triggering digital multimeter, makes digital multimeter enter " suspend mode " state, liquid crystal blank screen realizes guarantor
Protection circuit prevents the function of maloperation damage digital multimeter with voice prompting；If not corresponding to, intelligent voice prompt chip will be by
2 voice prompting content output phase of table answers voice signal, drive the speaker sounding, after voice prompting repeats 6 times, intelligent voice prompt
Chip detect the selected function gear of jack and the digital multimeter driver plate of test pencil plug insertion still not to it is corresponding when will pass through it
Delivery outlet triggers the automatic shutdown circuitry of digital multimeter, and digital multimeter is made to enter " suspend mode " state, and liquid crystal blank screen is realized
Protection circuit prevents the function of maloperation damage digital multimeter with voice prompting；To restore normal measurement, need to only press
The power switch of digital multimeter twice, such as table 1, table 2:
Table 1
Table 2
。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910465840.8A CN110208590A (en) | 2019-05-31 | 2019-05-31 | A kind of voice prompting protection circuit preventing maloperation damage digital multimeter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910465840.8A CN110208590A (en) | 2019-05-31 | 2019-05-31 | A kind of voice prompting protection circuit preventing maloperation damage digital multimeter |
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| CN110208590A true CN110208590A (en) | 2019-09-06 |
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| CN201910465840.8A Pending CN110208590A (en) | 2019-05-31 | 2019-05-31 | A kind of voice prompting protection circuit preventing maloperation damage digital multimeter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568241A (en) * | 2019-09-30 | 2019-12-13 | 贵州电网有限责任公司 | anti-misoperation multimeter and use method thereof |
| CN110687334A (en) * | 2019-10-09 | 2020-01-14 | 中国南方电网有限责任公司超高压输电公司柳州局 | Relay protection error-proof digital multimeter |
| CN110702962A (en) * | 2019-10-29 | 2020-01-17 | 中国南方电网有限责任公司超高压输电公司柳州局 | Universal meter pen of digital multimeter with anti-error measurement function |
-
2019
- 2019-05-31 CN CN201910465840.8A patent/CN110208590A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568241A (en) * | 2019-09-30 | 2019-12-13 | 贵州电网有限责任公司 | anti-misoperation multimeter and use method thereof |
| CN110568241B (en) * | 2019-09-30 | 2024-10-15 | 贵州电网有限责任公司 | Universal meter capable of preventing misoperation and use method thereof |
| CN110687334A (en) * | 2019-10-09 | 2020-01-14 | 中国南方电网有限责任公司超高压输电公司柳州局 | Relay protection error-proof digital multimeter |
| CN110702962A (en) * | 2019-10-29 | 2020-01-17 | 中国南方电网有限责任公司超高压输电公司柳州局 | Universal meter pen of digital multimeter with anti-error measurement function |
| CN110702962B (en) * | 2019-10-29 | 2021-12-17 | 中国南方电网有限责任公司超高压输电公司柳州局 | Universal meter pen of digital multimeter with anti-error measurement function |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190906 |