CN108732401A - A kind of multimeter measurement accuracy prior-warning device, method and multimeter - Google Patents
A kind of multimeter measurement accuracy prior-warning device, method and multimeter Download PDFInfo
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- CN108732401A CN108732401A CN201810721775.6A CN201810721775A CN108732401A CN 108732401 A CN108732401 A CN 108732401A CN 201810721775 A CN201810721775 A CN 201810721775A CN 108732401 A CN108732401 A CN 108732401A
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- 238000005259 measurement Methods 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000005611 electricity Effects 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 230000003287 optical effect Effects 0.000 claims abstract description 6
- 230000005669 field effect Effects 0.000 claims description 10
- 230000000694 effects Effects 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 230000006870 function Effects 0.000 description 6
- 230000007812 deficiency Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tests Of Electric Status Of Batteries (AREA)
Abstract
The present invention relates to a kind of multimeter measurement accuracy prior-warning devices, including：Power supply unit, processing unit, display unit and warning driving unit；Wherein, said supply unit further includes：Battery pack and voltage supplying module, the voltage supplying module obtains the current voltage difference signal of the battery pack and is sent to processing unit after converting, and the current voltage difference after analog-to-digital conversion is sent to the display unit and/or warning driving unit by the processing unit；The display unit further includes：Become optical module and LCD module.Multimeter measurement accuracy prior-warning device, method and multimeter described in the embodiment of the present invention realize the monitoring of auto-associating supplying cell electricity and measurement accuracy, not only have the prompt of dynamic light vision, but also be also equipped with the alarm of auditory effect；The darkening of use and the prompt of color area and LCD display interfaces are clear, and buzzing alarm times are apparent.User in use can be clear precognition battery powered electricity situation.
Description
Technical field
The invention belongs to instrument fields, and in particular to a kind of multimeter measurement accuracy prior-warning device, method and general-purpose
Table.
Background technology
Digital multimeter presses function classification, is divided into basic model (measuring voltage, current gear) common function and extended pattern
Two kinds of (with miscellaneous functions such as measuring diode, capacitance, inductance, temperature, times).The former is using reference current potential as full width
Spend voltage measurement, it is desirable that service voltage it is relatively low；The latter's is using service voltage as measuring, and measurement accuracy is often
It changes.For example, different voltage gears, which need to supply corresponding voltage, just can ensure that normal measurement accuracy.In addition, existing hand-held
The power supply mode of multimeter, substantially with dry cell power supply；But what kind of product no matter is positioned, what current battery was replaced
It is all that the height of supply voltage is judged with certain certain value by rule usual manner to define, and then shows that low pressure is shown by LCD
Symbol；Inform that user makes the judgement for replacing battery；This scheme is and the root using some given limit value as judging
According to the functional character of multimeter, low battery remains to meet common voltage, current measurement precision, i.e. battery is can be continuing with
's；And exactly on the charge value defined, user will generally select to abandon battery ahead of time and more renew battery.Therefore it needs
A kind of multimeter measurement accuracy prior-warning device is designed to alarm precision, and then judges the technical solution of electric power thus supplied.
Invention content
In view of the above-mentioned problems, the object of the present invention is to provide a kind of multimeter measurement accuracy prior-warning device, method and general-purposes
Table to solve not learning the specific electricity range of multimeter in the prior art, and then can not accurately confirm measurement accuracy
Problem.
To achieve the above object, the present invention takes following technical scheme：
A kind of multimeter measurement accuracy prior-warning device in the present invention, described device include：Power supply unit, processing unit,
Display unit and warning driving unit；Wherein, said supply unit further includes：Battery pack and voltage supplying module, it is described
Voltage supplying module obtains the current voltage difference signal of the battery pack and is sent to processing unit after converting, single by the processing
Current voltage difference after analog-to-digital conversion is sent to the display unit and/or warning driving unit by member；The display
Unit further includes：Become optical module and LCD module.
Above-mentioned multimeter measurement accuracy prior-warning device, it is preferred that the change optical module further includes：Become light panel components and electricity
Position device, the potentiometer adjust the illuminance in the variation color area for becoming light panel components, frequency according to different current voltage differences
Rate and/or color.
Above-mentioned multimeter measurement accuracy prior-warning device, it is preferred that the potentiometer is adjustable potentiometer or multiple fixed electricity
Resistance.
Above-mentioned multimeter measurement accuracy prior-warning device, it is preferred that the voltage supplying module further includes：Field-effect tube Q1,
Resistance R1 and capacitance C3, C4, wherein the drain electrode of the field-effect tube Q1 connects the anode of the battery pack by switching,
Grid connects the cathode of the battery pack by resistance R1, and source electrode is connect with the anode of capacitance C3 and C4, the capacitance C3
And the cathode ground connection of C4.
Above-mentioned multimeter measurement accuracy prior-warning device, it is preferred that the warning driving unit further includes：Resistance R2, three poles
Pipe Q4 and buzzer circuit, the resistance R2 connect the base stage of the processing unit and triode Q4, the triode Q4
Collector connect the buzzer circuit, the emitter ground connection of the triode Q4.
Multimeter in the present invention, including the multimeter measurement accuracy prior-warning device described in any one as above, described ten thousand
It is built in the multimeter with table measurement accuracy prior-warning device.
Multimeter measurement accuracy method for early warning in the present invention, including：
Current voltage difference signal is obtained, and it is poor that the current voltage difference signal obtained current voltage after analog-to-digital conversion
Value；
The size for comparing the current voltage difference and the first critical value, when the current voltage difference is more than described first
Critical value is then sent to display unit；
When the current voltage difference is less than first critical value, then the current voltage difference and second critical
The size of value, when the current voltage difference be less than second critical value, then be sent to display unit and warning driving unit,
The general-purpose apparent source is disconnected automatically simultaneously；
When the current voltage difference is between the first critical value and the second critical value, then be sent to display unit and/
Or warning driving unit.
Above-mentioned multimeter measurement accuracy method for early warning, it is preferred that when the current voltage difference between the first critical value with
Between second critical value, the method further includes：Judge the measurement gear of the multimeter；When the measurement gear is located at voltage
Or current gear, then it is sent to display unit and/or warning driving unit；When the measurement gear is located at non-voltage or current gear,
It is then sent to display unit and warning driving unit, simultaneously switches off the general-purpose apparent source.
Above-mentioned multimeter measurement accuracy method for early warning, it is preferred that the method further includes：It is poor according to different current voltages
Illuminance, frequency and/or the color in the variation color area of value adjustment display unit.
Above-mentioned multimeter measurement accuracy method for early warning, it is preferred that the method further includes：Electricity is provided by field-effect tube Q1
Pond polarity protection；Biasing is provided by resistance R1；Pass through capacitance C3, C4 burning voltage difference signals.
Multimeter measurement accuracy prior-warning device, method and the multimeter of the present invention realize auto-associating supplying cell electricity with
The monitoring of measurement accuracy not only has the prompt of dynamic light vision, but also is also equipped with the alarm of auditory effect；The darkening of use and
Color area prompts and LCD display interfaces are clear, and buzzing alarm times are apparent.User in use can be clear it is pre-
Know the situation of battery powered electricity.This launch has filled up at present the deficiency of routinely instrument industry.
Description of the drawings
Fig. 1 is the multimeter measurement accuracy prior-warning device structural schematic diagram that the embodiment of the present invention is provided；
Fig. 2 is the multimeter measurement accuracy prior-warning device structural schematic diagram that the embodiment of the present invention is provided；
Fig. 3 is the multimeter measurement accuracy method for early warning flow chart that the embodiment of the present invention is provided.
Specific implementation mode
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
A kind of multimeter measurement accuracy prior-warning device that the embodiment of the present invention is provided, as shown in Figure 1, described device packet
It includes：Power supply unit 10, processing unit 11, display unit 12 and warning driving unit 13；Wherein, said supply unit 10 is also wrapped
It includes：Battery pack 101 and voltage supplying module 102, the voltage supplying module 102 obtain the current electricity of the battery pack 101
It is sent to processing unit 11 after pressure difference signal and conversion, it is by the processing unit 11 that the current voltage after analog-to-digital conversion is poor
Value is sent to the display unit 12 and/or warning driving unit 13；The display unit further includes：Become optical module and LCD
Module.Preferably, acquiring the current voltage difference signal of battery pack 101 by ADC, and come to current voltage by comparing module
Difference is compared with the first critical value and the second critical value.
A kind of multimeter measurement accuracy prior-warning device that the embodiment of the present invention is provided is adopted in conjunction with the deficiency of product before now
With the dynamic instruction of LED discolorations, vision/prior-warning device that LCD characters are shown, three kinds of buzzing is combined, battery can be intuitively indicated
Electricity is associated with measurement accuracy, user can from vision and the sense of hearing etc., the easy electric power thus supplied for knowing product, from
And the selection that optional replacement is made to the battery that product is used or is replaced completely.
In specific embodiment of the present invention, as shown in Fig. 2, the darkening in the multimeter measurement accuracy prior-warning device
Module further includes：Become light panel components and potentiometer, the potentiometer adjusts the darkening according to different current voltage differences
Illuminance, frequency and/or the color in the variation color area of board group part.
In specific embodiment, the illuminance, frequency and/or the color that become the variation color area of light panel components can be when specific
Between or the different voltage difference of real-time display, and the illuminance, frequency and/or color for changing color area are adjusted by potentiometer
Whole.Different resistance values corresponding to potentiometer can reflect different illuminance, frequency and/or color.For example, booting
When, the automatic current voltage difference signal for detecting battery pack, when detecting current voltage difference >=2.5V, illuminance is larger, or
Person saltus step green and/or flashed with 2Hz frequencies, and with buzzer buzzing it is primary after can enter normal measurement mode.Work as inspection
Current voltage difference is measured in 2.21V~2.49V ranges, illuminance reduces, and saltus step is that yellow and/or LCD dodge rising space symbol
" Lb " extinguishes again after 2 seconds.And it is secondary with buzzer buzzing, indicate that voltage, current measurement ensure precision, other miscellaneous functions are not
Ensure precision.If detect battery capacity during booting or use and be in charge threshold level≤2.2V, illuminance is minimum, and
Saltus step is red, and LCD dodges and jumps " LLb " character 2 seconds, and flash rate reduces, and is closed with automatic after buzzer buzzing three times
Machine.It is used in the case of ultralow pressure to avoid user, the inaccurate query of measurement accuracy occurs.
Booting can be by becoming illuminance instruction every time, and aberration instruction, LCD characters and the prompt of buzzing police's sound can predict production
Product are for the electricity of battery, and without instruction in the not voltage range of setup parameter value, and LCD only shows normal mode of operation, by
The use state for judging battery capacity easily can be accurately illustrated in this.
Multimeter measurement accuracy prior-warning device described in the embodiment of the present invention, preferably, the potentiometer is adjustable potential
Device or multiple fixed resistances.For example, when potentiometer is adjustable potentiometer, adjustable potentiometer is according to different current voltage differences
It is changed, forms different resistance values, and adjust the light in the variation color area for becoming light panel components according to the difference of resistance value
Illumination, frequency and/or color.For another example when the potentiometer is multiple fixed resistances, according to the shunting size of each resistance
To adjust illuminance, frequency and/or the color in the variation color area for becoming light panel components.
Multimeter measurement accuracy prior-warning device described in the embodiment of the present invention, preferably, the voltage supplying module also wraps
It includes：Field-effect tube Q1, resistance R1 and capacitance C3, C4, wherein the drain electrode of the field-effect tube Q1 connects the electricity by switching
The anode of pond group, grid connect the cathode of the battery pack by resistance R1, and source electrode connects with the anode of capacitance C3 and C4
It connects, the cathode ground connection of the capacitance C3 and C4.Specifically, field-effect tube Q1 mainly acts on voltage transmission, it is on the one hand normal to supply
To using voltage, polarity protection is on the other hand acted on, prevents positive and negative anodes reverse and leads to damage of product.Resistance R1 is for providing
Biasing, capacitance C3 and C4 are for burning voltage difference signal and anti-interference so that device is more stablized.
Multimeter measurement accuracy prior-warning device described in the embodiment of the present invention, preferably, the warning driving unit also wraps
It includes：Resistance R2, triode Q4 and buzzer circuit, the resistance R2 connect the base of the processing unit and triode Q4
The collector of pole, the triode Q4 connects the buzzer circuit, the emitter ground connection of the triode Q4.Pass through triode
The circuit of Q4 and buzzer composition, can play the role of auditory tone cues.
The embodiment of the present invention also provides a kind of multimeter, including as above the multimeter described in any one embodiment measures essence
Prior-warning device is spent, the multimeter measurement accuracy prior-warning device is built in the multimeter, to reach when using multimeter,
The device can carry out early warning, specific embodiment and above-mentioned multimeter measurement accuracy prior-warning device phase to measurement accuracy automatically
Together, details are not described herein.
The embodiment of the present invention provides a kind of multimeter measurement accuracy method for early warning, as shown in figure 3, the method includes：
Step 301, current voltage difference signal is obtained, and the current voltage difference signal is worked as after analog-to-digital conversion
Preceding voltage difference；Specific current voltage difference signal is the current voltage of multimeter, reflects the state of battery pack in multimeter,
It can reflect the measurement accuracy of multimeter according to the difference of battery state.
Step 302, the size of the current voltage difference and the first critical value, when the current voltage difference is more than
First critical value, then enter step 303, be sent to display unit；Preferably, the first critical value is 2.5V, when current electricity
When pressure difference is more than first critical value, indicates that the electricity of battery pack in multimeter is sufficient, do not influence the precision measured.Preferably
, when current voltage difference is equal to first critical value, it is sent to display unit.
When the current voltage difference be less than first critical value, then enter step 304, the current voltage is poor
Value and the size of the second critical value then enter step 305, send when the current voltage difference is less than second critical value
To display unit and warning driving unit, the general-purpose apparent source is simultaneously switched off；Preferably, the second critical value is 2.2V, when working as
When preceding voltage difference is less than 2.2V, the not enough power supply of battery pack in multimeter is indicated, therefore in order not to cause measurement error, it is advanced
After row acousto-optic hint, user's multimeter powering quantity wretched insufficiency is informed, immediately product automatic shutdown.
Step 306, when the current voltage difference is between the first critical value and the second critical value, then it is sent to display
Unit and/or warning driving unit.Specifically, when voltage value is between 2.21V and 2.49V, the electricity of multimeter is fine,
Therefore user is reminded to replace battery or charging in proper moment.
Multimeter measurement accuracy method for early warning described in the embodiment of the present invention, preferably, working as the current voltage difference
Between the first critical value and the second critical value, the method further includes：Judge the measurement gear of the multimeter；When described
It measures gear and is located at voltage or current gear, be then sent to display unit and/or warning driving unit；When the measurement gear is located at
Non- voltage or current gear are then sent to display unit and warning driving unit, simultaneously switch off the general-purpose apparent source.Specifically,
Since when voltage value is between 2.21V and 2.49V, the electricity of multimeter is fine, the survey of voltage or electric current is not influenced at this time
Accuracy of measurement, but cannot be guaranteed the measurement accuracy of other miscellaneous functions, therefore first judge whether to be located at voltage or current gear, work as shelves
When position is located at voltage or current gear, only carries out prompting but do not influence to measure；When gear is located at other gears except voltage or electric current
When, then in order to ensure measurement accuracy, after first carrying out acousto-optic hint, inform user's multimeter powering quantity wretched insufficiency, immediately
Product automatic shutdown.
Multimeter measurement accuracy method for early warning described in the embodiment of the present invention, preferably, the method further includes：According to
Illuminance, frequency and/or the color in the variation color area of different current voltage difference adjustment display units.For example, automatic detection
The current voltage difference signal of battery pack, when detecting current voltage difference >=2.5V, the illuminance for adjusting display unit is larger,
Saltus step green and/or flashed with 2Hz frequencies, and with buzzer buzzing it is primary after can enter normal measurement mode.Work as detection
To current voltage difference in 2.21V~2.49V ranges, adjust display unit illuminance reduce, saltus step be yellow and/or
LCD dodges rising space symbol " Lb " and extinguishes again after 2 seconds.And it is secondary with buzzer buzzing, indicate that voltage, current measurement ensure precision,
Its miscellaneous function does not ensure precision.If detect battery capacity during booting or use and be in charge threshold level≤2.2V,
Adjusting the illuminance of display unit reduces, and saltus step is red, and LCD dodges and jumps " LLb " character 2 seconds, and flash rate reduces, and
With automatic shutdown after buzzer buzzing three times.It is used in the case of ultralow pressure to avoid user, it is inaccurate measurement accuracy occurs.
Multimeter measurement accuracy method for early warning described in the embodiment of the present invention, preferably, the method further includes：Pass through
Field-effect tube Q1 provides battery polar protection；Biasing is provided by resistance R1；Pass through capacitance C3, C4 burning voltage difference signals.
To sum up, the multimeter measurement accuracy prior-warning device described in the embodiment of the present invention, method and multimeter are realized automatic
It is associated with the monitoring of supplying cell electricity and measurement accuracy, not only there is the prompt of dynamic light vision, but also is also equipped with auditory effect
Alarm；The darkening of use and the prompt of color area and LCD display interfaces are clear, and buzzing alarm times are apparent.User is using
The situation of precognition battery powered electricity that in the process can be clear.This launch has filled up at present routinely instrument
The deficiency of industry.
The present invention is not limited to above-mentioned preferred forms, anyone can show that other are various under the inspiration of the present invention
The product of form, however, make any variation in its shape or structure, it is every that there is skill identical or similar to the present application
Art scheme, is within the scope of the present invention.
Claims (10)
1. a kind of multimeter measurement accuracy prior-warning device, which is characterized in that described device includes：Power supply unit, processing unit are shown
Show unit and warning driving unit；Wherein, said supply unit further includes：Battery pack and voltage supplying module, the electricity
Pressure supplying module obtains the current voltage difference signal of the battery pack and is sent to processing unit after converting, by the processing unit
Current voltage difference after analog-to-digital conversion is sent to the display unit and/or warning driving unit；The display is single
Member further includes：Become optical module and LCD module.
2. multimeter measurement accuracy prior-warning device according to claim 1, which is characterized in that the change optical module also wraps
It includes：Become light panel components and potentiometer, the potentiometer adjusts the change light panel components according to different current voltage differences
Change illuminance, frequency and/or the color in color area.
3. multimeter measurement accuracy prior-warning device according to claim 2, which is characterized in that the potentiometer is adjustable electric
Position device or multiple fixed resistances.
4. multimeter measurement accuracy prior-warning device according to claim 1, which is characterized in that the voltage supplying module is also
Including：Field-effect tube Q1, resistance R1 and capacitance C3, C4, wherein the drain electrode of the field-effect tube Q1 is by switching described in connection
The anode of battery pack, grid connect the cathode of the battery pack, anode of the source electrode with capacitance C3 and C4 by resistance R1
Connection, the cathode ground connection of the capacitance C3 and C4.
5. multimeter measurement accuracy prior-warning device according to claim 1, which is characterized in that the warning driving unit is also
Including：Resistance R2, triode Q4 and buzzer circuit, the resistance R2 connect the base of the processing unit and triode Q4
The collector of pole, the triode Q4 connects the buzzer circuit, the emitter ground connection of the triode Q4.
6. a kind of multimeter, which is characterized in that include the multimeter measurement accuracy early warning as described in claim 1-5 any one
Device, the multimeter measurement accuracy prior-warning device are built in the multimeter.
7. a kind of multimeter measurement accuracy method for early warning, which is characterized in that the method includes：
Current voltage difference signal is obtained, and the current voltage difference signal is obtained into current voltage difference after analog-to-digital conversion；
The size for comparing the current voltage difference and the first critical value, when the current voltage difference is critical more than described first
Value, then be sent to display unit；
When the current voltage difference is less than first critical value, then the current voltage difference and the second critical value
Size, when the current voltage difference be less than second critical value, then be sent to display unit and warning driving unit, simultaneously
Automatically the general-purpose apparent source is disconnected；
When the current voltage difference is between the first critical value and the second critical value, then display unit and/or police are sent to
Show driving unit.
8. a kind of multimeter measurement accuracy method for early warning according to claim 7, which is characterized in that when the current voltage
Between the first critical value and the second critical value, the method further includes difference：Judge the measurement gear of the multimeter；When
The measurement gear is located at voltage or current gear, then is sent to display unit and/or warning driving unit；When the measurement gear
Positioned at non-voltage or current gear, then it is sent to display unit and warning driving unit, while disconnecting the general-purpose apparent source automatically.
9. a kind of multimeter measurement accuracy method for early warning according to claim 7, which is characterized in that the method is also wrapped
It includes：Illuminance, frequency and/or the color in the variation color area of display unit are adjusted according to different current voltage differences.
10. a kind of multimeter measurement accuracy method for early warning according to claim 7, which is characterized in that the method is also wrapped
It includes：Battery polar protection is provided by field-effect tube Q1；Biasing is provided by resistance R1；Pass through capacitance C3, C4 steady voltage differences
Signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810721775.6A CN108732401A (en) | 2018-07-04 | 2018-07-04 | A kind of multimeter measurement accuracy prior-warning device, method and multimeter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810721775.6A CN108732401A (en) | 2018-07-04 | 2018-07-04 | A kind of multimeter measurement accuracy prior-warning device, method and multimeter |
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| CN108732401A true CN108732401A (en) | 2018-11-02 |
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| CN201810721775.6A Pending CN108732401A (en) | 2018-07-04 | 2018-07-04 | A kind of multimeter measurement accuracy prior-warning device, method and multimeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110736949A (en) * | 2019-10-16 | 2020-01-31 | 桂林市华谊智测科技有限责任公司 | digital multimeter calibration method and related device |
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| US6242920B1 (en) * | 1998-09-18 | 2001-06-05 | Tektronix, Inc. | Apparatus for use in a DMM for measuring the battery voltage of the DMM |
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2018
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| US5606481A (en) * | 1992-03-27 | 1997-02-25 | Tandy Corporation | Overvoltage protection for battery powered equipment |
| US6242920B1 (en) * | 1998-09-18 | 2001-06-05 | Tektronix, Inc. | Apparatus for use in a DMM for measuring the battery voltage of the DMM |
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