CN1458531A - Full automatic hook type electric meter - Google Patents
Full automatic hook type electric meter Download PDFInfo
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- CN1458531A CN1458531A CN 02119728 CN02119728A CN1458531A CN 1458531 A CN1458531 A CN 1458531A CN 02119728 CN02119728 CN 02119728 CN 02119728 A CN02119728 A CN 02119728A CN 1458531 A CN1458531 A CN 1458531A
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Abstract
The fully automatic hooked electric meter is used for fully automatic optional measurement of current, voltage and resistance. After the power supply for the meter is turned on, the measured electric quantity value may be obtained in the display without need further operation. The present invention is superior to available forcipated electric meter, which needs manual selection and likely meter and operator damage, and is safe and high in efficiency.
Description
Technical field
The present invention relates to a kind of ammeter, particularly a kind of automatic hook-type electricity meter.
Background technology
Existing ammeter can generally be divided into two kinds of electronics LCD liquid crystal display and mechanical scales, it shows the general general type of seeing the difference except that the table bulk measurement shows, all be equipped with the operation knob that multibank capability switches, and the function that the next door is provided with indicates, can be for the user with want test item, switch the gear of selecting the correlative measurement electrical property and according with scope to be measured and manually allot voluntarily, but such measurement mode, in fact still need to measure have suitable judgement on the electricity can be for it, if beginner or be unfamiliar with operation and then can cause institute's value numerical fault because of gear is selected inaccurate, select dislocation the table body is damaged even seriously be used in high voltage or high electric current, and injure operator's inherently safe.
Though there is the appearance of automatic type ammeter the market, can solve the above-mentioned shortcoming of being unfamiliar with the survey electricity of transferring the files, but its basic function is also only had AC voltage, dc voltage or three kinds of automatic measurement patterns of resistance measurement, can't make hook-type and use in the auto-measuring of alternating current, causes available measuring range greatly limited.
There is shortcoming as above when using, so this case inventor is going deep into creating the present invention after research and development improve in view of the formula of habit singly-bound ammeter.
Summary of the invention
Technical matters to be solved by this invention is the above-mentioned deficiency at prior art, and provide a kind of can arbitrarily colluding to be hung on any circuit, have full-automatic detecting and switch selection, can make the automatic hook-type electricity meter that AC and DC voltage, alternating current or resistance measure four kinds of patterns, this ammeter safety precisely, survey that electric numerical value is easy to interpretation and user as long as, do not remake other behaviour's part and just can obtain accurate electric weight value of reading from display screen with the electric power starting of ammeter.
Above-mentioned technical matters of the present invention is realized by following technical scheme.
A kind of automatic hook-type electricity meter is characterized in that mainly comprising:
One scale main body which is provided with a display, single controlling on key, the main body for plugging test probe, and the upper end also is provided with electric current folder for taking in a current;
One automatically judges handover mechanism, is judged selectedly when start at external input condition by the scale main body, and has four kinds of measurements such as a direct current voltage mode, an alternating voltage pattern, a resistance mode and an alternating current pattern; And
One preferential testing mechanism in automaticallying switch down, serve as preferential with the input signal of test probe, and the input signal that presss from both sides with electric current is less important;
By this, but make scale single key operating automated intelligent switch save operational motion and time, ammeter is hooked on any line making things convenient for the observed quantity measured value to improve facility and efficient, and can promote safety and avoid transferring wrong, and significantly improve high-amperage and survey the industrial safety of using.
Except that above-mentioned essential features, in specific implementation process, also can replenish following technology contents:
Wherein, when this scale has the voltage input to measure signal in DC voltage pattern, alternating voltage pattern or resistance mode probe two ends, it is the relative value of display voltage or resistance, opening a way probe not, input signal just shows the current value that the electric current folder is measured, if when the electric current folder also measures less than electric current, then show " OL " overflow state of resistance grade.
Wherein, the single key of controlling of this scale starts and shutdown for avometer, and the start back is to start a HOLD pattern, be used for measurement is remained on the display, in clicking＞then be during in 2 seconds shutdown under the open state, be to start the HOLD pattern in the time of＜2 seconds, again by once then cancelling the HOLD pattern.
Its inner built-up circuit more comprises except that single the controlling the key of aforementioned LCD display, hummer and control power supply:
One with an attenuator circuit and a holding circuit of test probe coupling;
One constant-current circuit provides a measuring current to holding circuit in resistance mode;
One switches circuit, and being used for the source of switched input signal is the signal of current sensing circuit, attenuator circuit or resistance circuit for detecting, and direct current signal is exported;
One instrument and display controller are according to the format of this digital quantity measured value of measurement mode treatment of selecting be converted to the form of these display needs;
One resistance circuit for detecting, the pattern of the signal that detecting is just being measured is voltage or resistance, does to switch interpretation and shows resistance value so that a control commutation circuit to instrument and display controller to be provided;
One current sensing circuit comprises amplifier, voltage divider and an aforesaid electric current folder, and the electric current folder detects the living AC signal coupling of miscarriage and delivers to the ac filter rectification circuit, becomes the direct current signal that is suitable for converting to the digital quantity measured value to change an AC signal; And
One analog/digital converter converts measuring value to the digital quantity measured value, sends to instrument and display controller, as interpretation condition that shows and demonstration.
Wherein, this attenuator circuit provides once the input voltage of regulating to aforesaid commutation circuit and ac filter rectification circuit, this commutation circuit is by the control of instrument and display controller, exports pairing electric current and voltage or resistance signal to analog/digital converter according to the present pattern that measures.
Wherein, the pattern that the essence of this instrument display controller input signal and big or small decision should measure with the state of control commutation circuit and display, and receives the signal of being sent here by button, keeps the state of display or shutdown according to the length of signal time.
Wherein, this body that encrusts is to do the top to such an extent that be easy to hand than the narrow avometer that makes in bottom, preferable being designed to of each size of housing can allow the avometer can hand-held with a hand, and be provided with hummer in it, its resistance mode can also comprise a continuity test, wherein probe is considered as short circuit to the resistance less than a critical resistance value, and is indicated via a display and a sound equipment between this.
Wherein, enter initial setting after detecting amount of batteries during this scale start, measure the direct current dc voltage earlier, measure 3 times with back 2 its mean values of average record, measure to exchange AC voltage afterwards, identical measurement 3 times is carried out back 2 its mean values of average record following a series of judgement and is moved:
A, if measurement direct current dc voltage greater than 1000V and when exchanging AC voltage also greater than 1000V, then shows combined-voltage overflow OLV signal, if the non-DC voltage overflow OL signal that then only shows during greater than 1000V of of ac measured value:
B, suppose that direct current DC measurement is between 1.5-1000V and equal negative 0.2V for a short time and then exchange AC and judge, if then show alternating voltage overflow OL signal greater than 1000V, if not when judging that then it exchanges the AC average voltage greater than the direct current dc voltage mean value that takes absolute value, then show measured for the AC alternating current and show its numerical value, if aforementionedly be judged as otherwise show being the DC alternating current and showing its numerical value of being measured;
C, if the direct current dc voltage that measured is lower than 1.5V, it is also non-during greater than 0.9V to exchange AC voltage, then in the absolute value of the measurement of direct current dc voltage if when being less than or equal to 0.3V, automatically switch into the measurement resistance mode, measure the AC current-mode if then automatically switch into during greater than 0.3V;
If d, inlet measuring resistance pattern measure 3 times back 2 mean deviations are write down its mean value, judge its resistance mean value during less than 2K ohm, then show the resistance value of its measurement, measure the AC current-mode if then skip to greater than 2K ohm; And
E, enter and measure the AC current-mode, identical measurement 3 times is write down its mean value with back 2 mean deviations, and judge the AC current average if then show the signal of AC current measurement overflow OL greater than 2000A, show then that in the 0.2-2000A scope measurement is the AC electric current and shows its numerical value if be situated between, and if the AC current average then is shown as the signal that resistance measures overflow OL less than 0.3A.
For reaching aforementioned purpose, the automatic hook-type electricity meter that the present invention is set, it mainly comprises: a scale main body, which is provided with a display, singlely control key, the exploration pin is established for plug wire in the main body right position, its upper end also is provided with electric current folder for taking in a current; One judges handover mechanism Auto Selection Function automatically, when start, judge selected at external input condition by the scale main body, and have four kinds of measurements such as a direct current voltage mode, an alternating voltage pattern, a resistance mode and an alternating current pattern: and a preferential testing mechanism, under automatic switchover mode, with the input signal of souning out pin serves as preferential, and the input signal that presss from both sides with electric current is less important; By this, but scale single key operating automated intelligent is switched, save the action and the time of operation ammeter, ammeter is hooked on any circuit to make things convenient for the observed quantity measured value to improve its facility and efficient, and it is wrong to avoid the user to transfer from line operate, and the table body that causes damage jeopardizes inherently safe, and can significantly improve high-amperage and survey the industrial safety of using.
The invention has the advantages that:
It can provide following function the actual manufactured goods that the aforementioned hardware of foundation cooperates with software on measuring, allowing ammeter operate can use by more humane easy operating:
1, judge automatically handover mechanism 2Auto Selection Function ASF contain Ω, V=, V～, A～.＞＞start ASF during start after, default initial, and LED will show the AUTO set symbol by direct current DCV.
Do not start when 2, DATA HOLD pattern is started shooting, under open state, click and control key and start in the time of 12＜2 seconds, then be shutdown during by＞2 seconds, HOLD will ring when starting and LCD shows the H symbol, this moment, picture was constant and stop the function of ASF, the measurement of A/D does not switch to other function, rings one again when the HOLD function is closed.
3, look into A/D earlier will measure DCV the time whether Low Battery signal is arranged whenever getting back to, have then to show battery symbol, measure DCV again.
4, it is bright entirely that the start original state is rung a LCD earlier.
5, still do not have when operation as the user after operating 30 minutes from last time, then shutdown or user are voluntarily when controlling key 12 and surpass 2 seconds voluntarily, and LCD removes and also rings a prompting.
6, the condition of other caution: ring during conversion LCD Presentation Function one, start ring immediately one, during shutdown LCD ring immediately one, if ohmic value＜during 100 Ω then sound can continue, will ring when the HOLD function on when closing, sound one when overflow takes place.
The present invention forms detailed operation and function, will be further described by following embodiment and accompanying drawing:
Description of drawings
Fig. 1 is the stereo appearance figure that the present invention colludes table.
Fig. 2 is that the present invention judges the process flow diagram that switches the preferential testing mechanism of collocation automatically.
Fig. 3 is the single control flow chart of controlling key of the present invention.
Fig. 4 is the thin portion process flow diagram that the present invention judges handover mechanism automatically.
Fig. 5 is the intelligent internal circuit diagram that colludes table of the present invention.
Embodiment
Shown in Fig. 1-6, a kind of automatic hook-type electricity meter that the present invention is set, it mainly comprises: a scale main body 1, judge automatically handover mechanism 2, and a preferential testing mechanism 3 form, wherein
This scale main body 1 which is provided with a display 11, the single key 12, main body 1 right position controlled is provided with test probe 13 for plug wire, and electric current folder 14 is also established for taking in a current 15 in its upper end;
Should automatically judge handover mechanism 2, when start, judge selectedly at external input condition and to have four kinds of measurements such as a direct current voltage mode, an alternating voltage pattern, a resistance mode and an alternating current pattern by scale main body 1: and
One preferential testing mechanism 3 under automatic switchover mode, serves as preferential with the input signal of test probe 13, is less important with the input signal of electric current folder 14;
By this, scale main body 1 can be switched with the single key operating automated intelligent, save the action and the time of operation ammeter, with electric current folder 14 ammeter is hooked on any circuit to make things convenient for the observed quantity measured value to improve its facility and efficient, and it is wrong to avoid the user to transfer from line operate, and the table body that causes damage jeopardizes inherently safe, and can significantly improve high-amperage and survey the industrial safety of using.
During the invention process in its scale main body 1 and can establish a hummer 16 and make in good time and provide sound sound at the survey state response, the top can be done to such an extent that be easy to hand when scale main body 1 is made than the narrow avometer that makes in bottom, the preferred configuration of each size allows the avometer can hand-held with a hand, make the single key 12 of controlling can be with taking the arbitrary hand hold avometer to be started, and singlely control key 12 and make the fix control of opening of HOLD pattern of double as transient state, promptly under off-mode this to control key 12 be to be used for starting avometer, back its of start controlled key 12 then can be with measurement being remained on the display 11 or closing the dual function of ammeter, when carrying out HOLD (maintenance) pattern, can be used to measurement is remained on the display, under open state, click＞then be 2 seconds the time shutdown, be to start the HOLD pattern in the time of＜2 seconds, again by once then cancelling the HOLD pattern.
The present invention can measure the automatic switchover mechanism 2 of four kinds of patterns, one direct current voltage mode, one alternating voltage pattern, one alternating current pattern, an and resistance mode, automatically judge switching by ammeter itself, in this avometer during at automatic switchover mode, can be main through the input signal of preferential testing mechanism 3 test probes 13, input signal with electric current folder 14 is a pair, that is to say in the DC voltage pattern, the alternating voltage pattern, or resistance mode test probe 13 is can measure signal the time, it is the relative value of display voltage or resistance, when no signal, just show 14 current values that measure of electric current folder, if when reaching electric current folder 14 and also measuring, just show Ω " OL " state of resistance grade overflow less than electric current.
Can allow the user when measuring voltage or resistance according to above-mentioned characteristic, ammeter can be hooked in and appoint on the bar circuit to make things convenient for the observed quantity measured value, no matter whether there is electric current to pass through on this line, all can correctly show voltage or the resistance value of being surveyed, as long as open a way not that input signal can press from both sides 14 measurement electric currents by electric current and when measuring electric current, will sound out pin 13, therefore using this avometer can provide facility and the security bigger in the use than known ammeter, has not been required to be to measure different signals and the hand shift measurement.
In the present invention design be when single control key 12 and be activated after, promptly be preset as voltage mode, if there is the voltage input at probe 13 two ends, judge that then whether AC is greater than 0.9V, whether DC is greater than 1.4V or not less than-0.1V, if judge that again what person of flip-flop and alternating component is big, on display 11, show conform to composition big interchange or DC voltage pattern, if not whether the testing resistance that then switches to resistance mode and judge test probe 13 two ends is less than 2000 ohm, if less than then showing the resistance value that is measured, greater than then switching to current-mode and judging that electric current presss from both sides 14 two ends no current is arranged.
Manner of execution as shown in Figure 4 more specifically, after entering initial setting elder generation detection amount of batteries when the present invention starts shooting, measure the direct current dc voltage earlier, measure 3 times with back 2 its mean values of average record, measure afterwards and exchange AC voltage, identical measurement 3 times is carried out following a series of judgement action again with back 2 its mean values of average record:
A, if measurement direct current dc voltage greater than 1000V and when exchanging AC voltage also greater than 1000V, then shows combined-voltage overflow OL signal, if the non-DC voltage overflow OL signal that then only shows during greater than 1000V of of ac measured value.
B, suppose that direct current DC measurement then exchanges AC judgement between 1.5-1000V and smaller or equal to negative 0.2V, if then show alternating voltage overflow OL signal greater than 1000V, when if not above situation exchanges the AC average voltage greater than the direct current dc voltage mean value that takes absolute value when it, then show measured for the AC alternating current and show its numerical value, otherwise then show measured for the DC direct current and show its numerical value.
C, if the direct current dc voltage that measured is lower than 1.5V, it is also non-during greater than 0.9V to exchange AC voltage, if when being less than or equal to 0.3V, then automatically switch into the measurement resistance mode in the absolute value of the measurement of direct current dc voltage, measure the AC current-mode if then automatically switch into during greater than 0.3V.
If D, inlet measuring resistance pattern measure 3 times back 2 mean deviations are write down its mean value, judge its resistance mean value during less than 2K ohm, then show the resistance value of its measurement, measure the AC current-mode if then skip to greater than 2K ohm.
E, enter and measure the AC current-mode, identical measurement 3 times is write down its mean value with back 2 mean deviations, and judge the AC current average if then show the signal of AC current measurement overflow OL greater than 2000A, show then that in the 0.3-2000A scope measurement is the AC electric current and shows its numerical value if be situated between, and if the AC current average then is shown as the signal that resistance measures overflow Ω OL less than 0.3A.
Please join shown in Fig. 1,5, be circuit system structure of the present invention, wherein, except that aforementioned LCD display 11, hummer 16 and control power circuit 99 single the controlling the key 12 with the HOLD pattern more comprises:
One with an attenuator circuit 90 and a holding circuit 91 of test probe 13 coupling;
One constant-current circuit 92 provides a measuring current to holding circuit 91 in resistance mode; Make electric current through this to a probe 13 and a coupling unknown resistance RX therebetween, the pressure drop on this unknown resistance RX just can be measured, and this resistance can be judged out according to following formula:
RX=pressure drop/measuring current
This resistance mode can also comprise a continuity test, wherein between this probe 13 is considered as short circuit to the resistance less than a critical resistance value, and is indicated via hummer 16 sound equipments.
One switches circuit 93, and being used for the source of switched input signal is signal or ACV, the DCV of attenuator circuit 90 or the resistance signal of resistance circuit for detecting 96 of current sensing circuit 94, and direct current signal is exported:
One instrument and display controller 95, according to the format of this digital quantity measured value of measurement mode treatment of selecting be converted to the form of these display 11 needs, with the gain of Control current sensing circuit 94 and attenuator circuit 90 attenuation ratio when the ACV, and the sound of control hummer 16;
One resistance circuit for detecting 96, the pattern of the signal that detecting is just being measured is voltage or resistance, makes to be switched and determined and to show resistance value so that a control commutation circuit 93 to instrument and display controller 95 to be provided;
One current sensing circuit 94, comprise amplifier, voltage divider and an aforesaid electric current folder 14, make electric current folder 14 detection electric currents produce AC signal coupling and deliver to ac filter rectification circuit 97, become the direct current signal that is suitable for converting to the digital quantity measured value with the conversion AC signal; And
One analog/digital converter 98 is converted to the digital quantity measured value with measuring value, delivers to instrument and display controller 95 as showing the interpretation condition and showing.
Wherein this attenuator circuit 90 provides once the input voltage of regulating to aforesaid commutation circuit 93 and ac filter rectification circuit 97, this commutation circuit 93 is by 95 controls of instrument and display controller, exports pairing electric current and voltage or resistance signal to ADC analog/digital converter 98 according to the present pattern that measures.
And the pattern that 95 controls of this instrument display controller should measure according to the essence and the big or small decision of input signal, state with control commutation circuit 93 and display 11, and receive by controlling the signal that key 12 is sent here, keep the state or the shutdown of display 11 according to the length of signal time.
Below preferred embodiment of the present invention has been done an explanation, allly be skillful in this skill person when can doing other all improvement, but these change in the claim that still belongs to invention spirit of the present invention and defined according to above-mentioned explanation.
Can make by above detailed description and to know this skill person and understand that the present invention can reach aforesaid purpose really, has the value on the industry.
Claims (8)
1, a kind of automatic hook-type electricity meter is characterized in that mainly comprising:
One scale main body which is provided with a display, single controlling on key, the main body for plugging test probe, and the upper end also is provided with electric current folder for taking in a current;
One automatically judges handover mechanism, is judged selectedly when start at external input condition by the scale main body, and has four kinds of measurements such as a direct current voltage mode, an alternating voltage pattern, a resistance mode and an alternating current pattern; And
One preferential testing mechanism in automaticallying switch down, serve as preferential with the input signal of test probe, and the input signal that presss from both sides with electric current is less important;
By this, but make scale single key operating automated intelligent switch save operational motion and time, ammeter is hooked on any line making things convenient for the observed quantity measured value to improve facility and efficient, and can promote safety and avoid transferring wrong, and significantly improve high-amperage and survey the industrial safety of using.
2, automatic hook-type electricity meter according to claim 1, it is characterized in that: wherein, when this scale has the voltage input to measure signal in DC voltage pattern, alternating voltage pattern or resistance mode probe two ends, it is the relative value of display voltage or resistance, opening a way probe not, input signal just shows the current value that the electric current folder is measured, if when the electric current folder also measures less than electric current, then show " OL " overflow state of resistance grade.
3, automatic hook-type electricity meter according to claim 1, it is characterized in that: wherein, the single key of controlling of this scale starts and shutdown for avometer, and the start back is to start a HOLD pattern, be used for measurement is remained on the display, in click under the open state＞then be shutdown during in 2 seconds, in the time of＜2 seconds for starting the HOLD pattern, again by once then cancelling the HOLD pattern.
4, automatic hook-type electricity meter according to claim 1 is characterized in that: its inner built-up circuit more comprises except that single the controlling the key of aforementioned LCD display, hummer and control power supply:
One with an attenuator circuit and a holding circuit of test probe coupling;
One constant-current circuit provides a measuring current to holding circuit in resistance mode;
One switches circuit, and being used for the source of switched input signal is the signal of current sensing circuit, attenuator circuit or resistance circuit for detecting, and direct current signal is exported;
One instrument and display controller are according to the format of this digital quantity measured value of measurement mode treatment of selecting be converted to the form of these display needs;
One resistance circuit for detecting, the pattern of the signal that detecting is just being measured is voltage or resistance, does to switch interpretation and shows resistance value so that a control commutation circuit to instrument and display controller to be provided;
One current sensing circuit comprises amplifier, voltage divider and an aforesaid electric current folder, and the electric current folder detects the living AC signal coupling of miscarriage and delivers to the ac filter rectification circuit, becomes the direct current signal that is suitable for converting to the digital quantity measured value to change an AC signal; And
One analog/digital converter converts measuring value to the digital quantity measured value, sends to instrument and display controller, as interpretation condition that shows and demonstration.
5, automatic hook-type electricity meter according to claim 4, it is characterized in that: wherein this attenuator circuit provides once the input voltage of regulating to aforesaid commutation circuit and ac filter rectification circuit, this commutation circuit is by the control of instrument and display controller, exports pairing electric current and voltage or resistance signal to analog/digital converter according to the present pattern that measures.
6, automatic hook-type electricity meter according to claim 4, it is characterized in that: the essence of this instrument display controller input signal and the big or small decision pattern that should measure wherein, state with control commutation circuit and display, and receive the signal of sending here by button, length according to signal time is kept, the state of display or shutdown.
7, automatic hook-type electricity meter according to claim 1, it is characterized in that: wherein, this body that encrusts is to do the top to such an extent that be easy to hand than the narrow avometer that makes in bottom, preferable being designed to of each size of housing can allow the avometer can hand-held with a hand, and be provided with hummer in it, its resistance mode can also comprise a continuity test, wherein between this probe is considered as short circuit to the resistance less than a critical resistance value, and is indicated via a display and a sound equipment.
8, automatic hook-type electricity meter according to claim 1, it is characterized in that: wherein, enter initial setting after detecting amount of batteries during this scale start, measure the direct current dc voltage earlier, measure 3 times with back 2 its mean values of average record, measure to exchange AC voltage afterwards, identical measurement 3 times is carried out back 2 its mean values of average record following a series of judgement and is moved:
A, if measurement direct current dc voltage greater than 1000V and when exchanging AC voltage also greater than 1000V, then shows combined-voltage overflow OLV signal, if the non-DC voltage overflow OL signal that then only shows during greater than 1000V of of ac measured value:
B, suppose that direct current DC measurement is between 1.5-1000V and equal negative 0.2V for a short time and then exchange AC and judge, if then show alternating voltage overflow OL signal greater than 1000V, if not when judging that then it exchanges the AC average voltage greater than the direct current dc voltage mean value that takes absolute value, then show measured for the AC alternating current and show its numerical value, if aforementionedly be judged as otherwise show being the DC alternating current and showing its numerical value of being measured;
C, if the direct current dc voltage that measured is lower than 1.5V, it is also non-during greater than 0.9V to exchange AC voltage, then in the absolute value of the measurement of direct current dc voltage if when being less than or equal to 0.3V, automatically switch into the measurement resistance mode, measure the AC current-mode if then automatically switch into during greater than 0.3V;
If d, inlet measuring resistance pattern measure 3 times back 2 mean deviations are write down its mean value, judge its resistance mean value during less than 2K ohm, then show the resistance value of its measurement, measure the AC current-mode if then skip to greater than 2K ohm; And
E, enter and measure the AC current-mode, identical measurement 3 times is write down its mean value with back 2 mean deviations, and judge the AC current average if then show the signal of AC current measurement overflow OL greater than 2000A, show then that in the 0.2-2000A scope measurement is the AC electric current and shows its numerical value if be situated between, and if the AC current average then is shown as the signal that resistance measures overflow OL less than 0.3A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021197288A CN1293386C (en) | 2002-05-15 | 2002-05-15 | Full automatic hook type electric meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021197288A CN1293386C (en) | 2002-05-15 | 2002-05-15 | Full automatic hook type electric meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1458531A true CN1458531A (en) | 2003-11-26 |
| CN1293386C CN1293386C (en) | 2007-01-03 |
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ID=29426868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021197288A Expired - Fee Related CN1293386C (en) | 2002-05-15 | 2002-05-15 | Full automatic hook type electric meter |
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| Country | Link |
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| CN (1) | CN1293386C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101315395B (en) * | 2007-05-28 | 2011-06-15 | 承永资讯科技股份有限公司 | Intelligent multifunctional measuring apparatus and method thereof |
| CN101650380B (en) * | 2008-08-15 | 2012-11-28 | 承永资讯科技股份有限公司 | Intelligent measuring device automatically selecting measuring functions |
| CN111965407A (en) * | 2020-08-18 | 2020-11-20 | 中国南方电网有限责任公司超高压输电公司天生桥局 | Secondary circuit safety measuring equipment |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4152639A (en) * | 1978-01-27 | 1979-05-01 | Mono-Probe Corporation | Electrical circuit voltage and continuity testing device |
| CN87201296U (en) * | 1987-04-28 | 1988-02-03 | 张安钢 | Ac digital tong-type ammeter |
| US5119019A (en) * | 1989-11-28 | 1992-06-02 | John Fluke Mfg. Co., Inc. | Automatic function selecting multimeter |
| GB2271429B (en) * | 1992-09-30 | 1997-01-22 | Seiko Epson Corp | Digital tester |
| US5508607A (en) * | 1994-08-11 | 1996-04-16 | Fluke Corporation | Electronic test instrument for component test |
| US6043640A (en) * | 1997-10-29 | 2000-03-28 | Fluke Corporation | Multimeter with current sensor |
| US6218824B1 (en) * | 1998-05-07 | 2001-04-17 | Tektronix, Inc. | Simplified user interface and control system for a multimeter |
-
2002
- 2002-05-15 CN CNB021197288A patent/CN1293386C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101315395B (en) * | 2007-05-28 | 2011-06-15 | 承永资讯科技股份有限公司 | Intelligent multifunctional measuring apparatus and method thereof |
| CN101650380B (en) * | 2008-08-15 | 2012-11-28 | 承永资讯科技股份有限公司 | Intelligent measuring device automatically selecting measuring functions |
| CN111965407A (en) * | 2020-08-18 | 2020-11-20 | 中国南方电网有限责任公司超高压输电公司天生桥局 | Secondary circuit safety measuring equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1293386C (en) | 2007-01-03 |
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