CN208488489U - A kind of multimeter measurement accuracy prior-warning device and multimeter - Google Patents
A kind of multimeter measurement accuracy prior-warning device and multimeter Download PDFInfo
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- CN208488489U CN208488489U CN201821049427.0U CN201821049427U CN208488489U CN 208488489 U CN208488489 U CN 208488489U CN 201821049427 U CN201821049427 U CN 201821049427U CN 208488489 U CN208488489 U CN 208488489U
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Abstract
The utility model relates to a kind of multimeter measurement accuracy prior-warning devices, comprising: power supply unit, processing unit, display unit and warning driving unit；Wherein, said supply unit further include: 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 include: darkening module and LCD module.Multimeter measurement accuracy prior-warning device described in the utility model embodiment and multimeter 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 interface are clear, and buzzing alarm times are obvious.User in use can be clear precognition battery power supply amount situation.
Description
Technical field
The utility model belongs to instrument field, and in particular to a kind of multimeter measurement accuracy prior-warning device and general-purpose
Table.
Background technique
Digital multimeter presses function classification, is divided into basic model (measurement voltage, current gear) common function and extended pattern
Two kinds of (with miscellaneous functions such as measuring diode, capacitor, 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 measurement, 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, current battery replacement
Defining all is that the height of supply voltage is judged with certain certain value by rule usual manner, then shows that low pressure is shown by LCD
Symbol；Inform that user makes the judgement of replacement battery；This scheme is using some given limit value as judgement, and root
According to the functional character of multimeter, low battery is still able to satisfy common voltage, current measurement precision, i.e. battery is can to continue to use
'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.
Utility model content
In view of the above problems, the object of the present invention is to provide a kind of multimeter measurement accuracy prior-warning device and general-purposes
Table to the specific electricity range for solving not learning multimeter in the prior art, and then can not accurately confirm measurement accuracy
Problem.
To achieve the above object, the utility model takes following technical scheme:
One of the utility model multimeter measurement accuracy prior-warning device, described device includes: power supply unit, and processing is single
Member, display unit and warning driving unit；Wherein, said supply unit further include: battery pack and voltage supplying module, institute
It states voltage supplying module to obtain the current voltage difference signal of the battery pack and be sent to processing unit after converting, by the processing
Current voltage difference after analog-to-digital conversion is sent to the display unit and/or warning driving unit by unit；It is described aobvious
Show unit further include: darkening module and LCD module.
Above-mentioned multimeter measurement accuracy prior-warning device, it is preferred that the darkening module further include: 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 include: field-effect tube Q1,
Resistance R1 and capacitor C3, C4, wherein the drain electrode of the field-effect tube Q1 connects the anode of the battery pack by switch,
Grid connects the cathode of the battery pack by resistance R1, and source electrode is connect with the anode of capacitor C3 and C4, the capacitor 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 include: 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.
Above-mentioned multimeter measurement accuracy prior-warning device, it is preferred that the processing unit further includes ADC and comparison module,
The ADC connection voltage supplying module, the comparison module connect the ADC.
Above-mentioned multimeter measurement accuracy prior-warning device, it is preferred that the ADC further comprises: AD acquisition module and AD
The current voltage difference signal of the collected battery pack is sent to the AD operation mould by computing module, the AD acquisition module
Block carries out analog-to-digital conversion into current voltage difference by the AD computing module, then the current voltage difference is sent to described
Comparison module.
Above-mentioned multimeter measurement accuracy prior-warning device, it is preferred that the ADC is 24.
Above-mentioned multimeter measurement accuracy prior-warning device, it is preferred that the LCD module further include: 7 sections or 8 segment decoders.
Multimeter in the utility model, including multimeter measurement accuracy prior-warning device described in any one as above, institute
Multimeter measurement accuracy prior-warning device is stated to be built in the multimeter.
The multimeter measurement accuracy prior-warning device and multimeter of the utility model 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
The prompt of color area and LCD display interface are clear, and buzzing alarm times are obvious.User in use can be clear it is pre-
Know the situation of battery power supply amount.This launch has filled up at present the deficiency of routinely instrument industry.
Detailed description of the invention
Fig. 1 is multimeter measurement accuracy prior-warning device structural schematic diagram provided by the utility model embodiment；
Fig. 2 is multimeter measurement accuracy prior-warning device structural schematic diagram provided by the utility model embodiment；
Fig. 3 is multimeter measurement accuracy method for early warning flow chart provided by the utility model embodiment.
Specific embodiment
The utility model is described in detail with reference to the accompanying drawings and examples.
A kind of multimeter measurement accuracy prior-warning device provided by the utility model embodiment, as shown in Figure 1, described device
It include: power supply unit 10, processing unit 11, display unit 12 and warning driving unit 13；Wherein, said supply unit 10 is gone back
It include: battery pack 101 and voltage supplying module 102, the voltage supplying module 102 obtains the current of the battery pack 101
Voltage differential signal is simultaneously sent to processing unit 11 after converting, by the processing unit 11 by the current voltage after analog-to-digital conversion
Difference is sent to the display unit 12 and/or warning driving unit 13；The display unit further include: darkening module and
LCD module.Preferably, acquiring the current voltage difference signal of battery pack 101 by ADC, and come by comparing module to current
Voltage difference is compared with the first critical value and the second critical value.
A kind of multimeter measurement accuracy prior-warning device provided by the utility model embodiment, not in conjunction with product before now
Foot is shown, three kinds of the buzzing vision/prior-warning devices combined using the dynamic instruction of LED discoloration, LCD character, can intuitively be indicated
Battery capacity is associated with measurement accuracy, and user can be from vision and the sense of hearing etc., the easy power supply feelings for knowing product
Condition, thus the selection making optional replacement to the battery that product is used or replacing completely.
In the utility model specific embodiment, as shown in Fig. 2, in the multimeter measurement accuracy prior-warning device
Darkening module further include: become light panel components and potentiometer, the potentiometer is according to different current voltage difference adjustment
Become illuminance, frequency and/or the color in the variation color area of light panel components.
In specific embodiment, illuminance, frequency and/or the color for becoming 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 are able to reflect out 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 jump green and/or flashed with 2Hz frequency, 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 range, illuminance reduces, and jumps and dodges rising space symbol for yellow and/or LCD
" Lb " extinguishes again after 2 seconds.And it is secondary with buzzer buzzing, indicate that voltage, current measurement guarantee precision, other miscellaneous functions are not
Guarantee precision.If detect battery capacity in booting or use process and be in charge threshold level≤2.2V, illuminance is minimum, and
Jump is red, and LCD is dodged and jumped " 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 where ultralow pressure to avoid user, the inaccurate query of measurement accuracy occurs.
Booting can be indicated by darkening illumination every time, and color difference instruction, LCD character and the alert sound prompt of buzzing 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 utility model embodiment, preferably, the potentiometer is adjustable
Potentiometer or multiple fixed resistances.For example, adjustable potentiometer is according to different current voltages when potentiometer is adjustable potentiometer
Difference is changed, and forms different resistance values, and adjust the variation color area for becoming light panel components according to the difference of resistance value
Illuminance, frequency and/or color.For another example when the potentiometer is multiple fixed resistances, according to the shunting of each resistance
Size come adjust it is described become light panel components variation color area illuminance, frequency and/or color.
Multimeter measurement accuracy prior-warning device described in the utility model embodiment, preferably, the voltage supplying module
Further include: field-effect tube Q1, resistance R1 and capacitor C3, C4, wherein the drain electrode of the field-effect tube Q1 passes through switch connection institute
State the anode of battery pack, grid connects the cathode of the battery pack by resistance R1, source electrode with capacitor C3 and C4 just
Pole connection, the cathode ground connection of the capacitor C3 and C4.Specifically, field-effect tube Q1 mainly acts on voltage transmitting, on the one hand just
Often supply uses voltage, on the other hand acts on polarity protection, prevents positive and negative anodes reverse and leads to damage of product.Resistance R1 is used for
Biasing is provided, capacitor C3 and C4 are for burning voltage difference signal and anti-interference, so that device is more stable.
Multimeter measurement accuracy prior-warning device described in the utility model embodiment, preferably, the warning driving unit
Further include: resistance R2, triode Q4 and buzzer circuit, the resistance R2 connect the processing unit and triode Q4
Base stage, the collector of the triode Q4 connect the buzzer circuit, the emitter ground connection of the triode Q4.Pass through three poles
The circuit of pipe Q4 and buzzer composition, can play the role of auditory tone cues.
The utility model embodiment also provides a kind of multimeter, surveys including multimeter described in any one embodiment as above
Accuracy of measurement prior-warning device, the multimeter measurement accuracy prior-warning device are built in the multimeter, are using general-purpose to reach
When table, which can carry out early warning, specific embodiment and above-mentioned multimeter measurement accuracy early warning to measurement accuracy automatically
Device is identical, and details are not described herein.
In the utility model preferred embodiment, the ADC further comprises: AD acquisition module and AD computing module,
The current voltage difference signal of the collected battery pack is sent to the AD computing module by the AD acquisition module, by described
AD computing module carries out analog-to-digital conversion and is sent to the comparison module at current voltage difference, then by the current voltage difference.
Multimeter measurement accuracy prior-warning device in the utility model embodiment, preferably, the ADC is 24.
Multimeter measurement accuracy prior-warning device in the utility model embodiment, preferably, the LCD module further include: 7
Section or 8 segment decoders.
The utility model embodiment provides a kind of multimeter measurement accuracy method for early warning, as shown in figure 3, the method packet
It 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 greater 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 greater than first critical value, indicates that the electricity of battery pack in multimeter is sufficient, do not influence the precision of measurement.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 power supply amount 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, the electricity of multimeter is fine when voltage value is between 2.21V and 2.49V,
Therefore user is reminded to replace battery or charging in proper moment.
Multimeter measurement accuracy method for early warning described in the utility model embodiment, preferably, working as the current voltage
Difference between the first critical value and the second critical value, the method also includes: judge the measuring gear of the multimeter；When
The measuring gear is located at voltage or current gear, then is sent to display unit and/or warning driving unit；When the measuring gear
Positioned at non-voltage or current gear, then it is sent to display unit and warning driving unit, simultaneously switches off the general-purpose apparent source.Specifically
, since when voltage value is between 2.21V and 2.49V, the electricity of multimeter is fine, do not influence voltage or electric current at this time
Measurement accuracy, but cannot be guaranteed the measurement accuracy of other miscellaneous functions, therefore first judge whether to be located at voltage or current gear, when
When gear is located at voltage or current gear, only carries out prompting but do not influence to measure；When gear is located at other shelves except voltage or electric current
When position, then in order to guarantee measurement accuracy, after first carrying out acousto-optic hint, user's multimeter power supply amount wretched insufficiency is informed, with
That is product automatic shutdown.
Multimeter measurement accuracy method for early warning described in the utility model embodiment, preferably, the method also 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
The current voltage difference signal of detection battery pack adjusts the illuminance of display unit when detecting current voltage difference >=2.5V
It is larger, jump green and/or flashed with 2Hz frequency, and with buzzer buzzing it is primary after can enter normal measurement mode.When
Current voltage difference is detected in 2.21V~2.49V range, adjust display unit illuminance reduce, jump for 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 guarantee precision,
Other miscellaneous functions do not guarantee precision.If detecting battery capacity in booting or use process is in charge threshold level≤2.2V
When, the illuminance for adjusting display unit reduces, and jumps to be red, and LCD is dodged and jumped " LLb " character 2 seconds, flash rate drop
It is low, and with automatic shutdown after buzzer buzzing three times.It is used in the case where ultralow pressure to avoid user, measurement accuracy occurs
It is inaccurate.
Multimeter measurement accuracy method for early warning described in the utility model embodiment, preferably, the method also includes:
Battery polar protection is provided by field-effect tube Q1；Biasing is provided by resistance R1；Pass through capacitor C3, C4 steady voltage difference letter
Number.
To sum up, the prior-warning device of multimeter measurement accuracy described in the utility model embodiment, method and multimeter are realized
The monitoring of auto-associating supplying cell electricity and measurement accuracy not only has the prompt of dynamic light vision, but also is also equipped with the sense of hearing
The alarm of effect；The darkening of use and the prompt of color area and LCD display interface are clear, and buzzing alarm times are obvious.User exists
The situation of precognition battery power supply amount that can be clear in use process.This launch has been filled up at present routinely
The deficiency of instrument industry.
The utility model is not limited to above-mentioned preferred forms, anyone can obtain under the enlightenment of the utility model
Other various forms of products, however, make any variation in its shape or structure, it is all that there is same as the present application or phase
Approximate technical solution, all falls within the protection scope of the utility model.
Claims (10)
1. a kind of multimeter measurement accuracy prior-warning device, which is characterized in that described device includes: power supply unit, and processing unit is shown
Show unit and warning driving unit；Wherein, said supply unit further include: 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 include: darkening module and LCD module.
2. multimeter measurement accuracy prior-warning device according to claim 1, which is characterized in that the darkening module is also wrapped
It includes: becoming 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
It include: field-effect tube Q1, resistance R1 and capacitor C3, C4, wherein the drain electrode of the field-effect tube Q1 passes through described in switch connection
The anode of battery pack, grid connect the cathode of the battery pack, anode of the source electrode with capacitor C3 and C4 by resistance R1
Connection, the cathode ground connection of the capacitor 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
It include: resistance R2, triode Q4 and buzzer circuit, the resistance R2 connects the base of the processing unit and triode Q4
Pole, the collector of the triode Q4 connect the buzzer circuit, the emitter ground connection of the triode Q4.
6. multimeter measurement accuracy prior-warning device according to claim 1, which is characterized in that the processing unit further includes
ADC and comparison module, the ADC connection voltage supplying module, the comparison module connect the ADC.
7. multimeter measurement accuracy prior-warning device according to claim 6, which is characterized in that the ADC further comprises:
AD acquisition module and AD computing module, the AD acquisition module send out the current voltage difference signal of the collected battery pack
The AD computing module is given, analog-to-digital conversion is carried out at current voltage difference, then by the current electricity by the AD computing module
Pressure difference is sent to the comparison module.
8. multimeter measurement accuracy prior-warning device according to claim 6, which is characterized in that the ADC is 24.
9. multimeter measurement accuracy prior-warning device according to claim 1, which is characterized in that the LCD module further include:
7 sections or 8 segment decoders.
10. a kind of multimeter, which is characterized in that pre- including multimeter measurement accuracy as described in any one of claims 1-9
Alarm device, the multimeter measurement accuracy prior-warning device are built in the multimeter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821049427.0U CN208488489U (en) | 2018-07-04 | 2018-07-04 | A kind of multimeter measurement accuracy prior-warning device and multimeter |
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| CN201821049427.0U CN208488489U (en) | 2018-07-04 | 2018-07-04 | A kind of multimeter measurement accuracy prior-warning device and multimeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108732401A (en) * | 2018-07-04 | 2018-11-02 | 优利德科技(中国)股份有限公司 | A kind of multimeter measurement accuracy prior-warning device, method and multimeter |
-
2018
- 2018-07-04 CN CN201821049427.0U patent/CN208488489U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108732401A (en) * | 2018-07-04 | 2018-11-02 | 优利德科技(中国)股份有限公司 | A kind of multimeter measurement accuracy prior-warning device, method and multimeter |
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