CN201004072Y - An automatic gear conversion and range measurement circuit - Google Patents
An automatic gear conversion and range measurement circuit Download PDFInfo
- Publication number
- CN201004072Y CN201004072Y CNU2007200672235U CN200720067223U CN201004072Y CN 201004072 Y CN201004072 Y CN 201004072Y CN U2007200672235 U CNU2007200672235 U CN U2007200672235U CN 200720067223 U CN200720067223 U CN 200720067223U CN 201004072 Y CN201004072 Y CN 201004072Y
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- circuit
- measurement
- voltage
- range
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Abstract
The utility model provides a measuring circuit automatically converting the shift and the range, relating to the electronic measure technical field, which is to solve the technical problem that the measuring circuit is able to automatically converting the shift and the range. The measuring general circuit comprises a voltage resistance input circuit, a simulation switch and a high voltage endurable optical isolation MOS switch circuit, respectively connected with the protection circuit, the reference resistance and the AD conversion circuit of the voltage resistance input circuit, the simulation switch and the high voltage endurable optical isolation MOS switch circuit, for distinguishing the detected signal, controlling the simulation switch and the high voltage endurable optical isolation MOS switch conversion measuring shift and selecting the appropriate reference resistance matching the input circuit after the range measurement, being fit for the single chip of the measuring circuit measurement, besides, the single chip is respectively connected with the simulation switch, the high voltage endurable optical isolation MOS switch circuit and the AD conversion circuit. Being able to automatically switch the shift and the range, when in use, the utility model has the characteristic of realizing the measurement of the voltage, resistance, and the current without converting any switch knob.
Description
Technical field
The utility model relates to electronic measurement technique, particularly relates to a kind of various testing meter and instruments that are applicable to, is particularly useful for the measuring technique of handheld digital pincerlike meter and digital multimeter.
Background technology
Present instrument and meter all is provided with a lot of function conversion keys or knob, will be during operation with switch transition to certain function gear, use very inconveniently, and and the operator forgets easily sometimes when switching driving switch instrument and meter is damaged.
The utility model content
At the defective that exists in the above-mentioned prior art, technical problem to be solved in the utility model provides a kind of gear and range can changed automatically, need not to change any switching knob during use and can realize the automatic conversion gear of voltage resistance current measurement and the metering circuit of range.
In order to solve the problems of the technologies described above, the measurement way circuit of a kind of automatic conversion gear provided by the utility model and range comprises:
One voltage resistance input circuit;
One analog switch and high pressure resistant light are isolated the MOS on-off circuit, connect the voltage resistance input circuit;
One holding circuit connects voltage resistance input circuit and analog switch and high pressure resistant light respectively and isolates the MOS on-off circuit; Realize input circuit, analog switch and high pressure resistant light are isolated the protection of MOS on-off circuit by holding circuit;
One reference resistance connects analog switch and high pressure resistant light and isolates the MOS on-off circuit;
One A/D convertor circuit is used to realize the conversion of analog to digital, connects reference resistance;
One single-chip microcomputer connects analog switch and high pressure resistant light respectively and isolates MOS on-off circuit, A/D convertor circuit; Be used to discern measured signal, control analog switch and high pressure resistant light are selected suitable reference resistance and input circuit collocation after isolating MOS switch transition measurement gear and measuring range, make it to be fit to the metering circuit measurement, the data holding signal that the reception user imports from keyboard reaches from the AD sense data and is handling video data afterwards;
One display connects single-chip microcomputer.
Further, be connected with buffer circuit between described reference resistance and the A/D convertor circuit, be used to provide the impedance matching between prime reduction voltage circuit and the ADC.
Further, be connected with frequency measurement circuit between described single-chip microcomputer and the buffer circuit, comparer becomes digital pulse signal with the analog AC conversion of signals, handles to make things convenient for single-chip microcomputer, and the frequency that records signal is used as judges the foundation that exchanges with direct current signal.
Further, be connected with the automatic zero set (AZS) circuit between described single-chip microcomputer and the buffer circuit, by providing bias voltage for voltage and current measurement virtually, the automatic zero set (AZS) circuit is realized the offset voltage zeroing of circuit.
Further, described single-chip microcomputer connects button, is used to import the data holding signal.
Further, described A/D convertor circuit connects current transformer.
Utilize the automatic conversion gear that the utility model provides and the metering circuit of range, owing to adopt single-chip microcomputer identification measured signal, control analog switch and high pressure resistant light are selected suitable reference resistance and input circuit collocation after isolating MOS switch transition measurement gear and measuring range, making it to be fit to metering circuit measures, so the utility model brings convenience for the user, its metering circuit can be changed gear and range automatically, need not to change the measurement that any switching knob can be realized combined-voltage, resistance, ac and dc current during use.Because have the function of automatic switchover gear, can protect instrument and meter not to be damaged.
Description of drawings
Fig. 1 is the circuit function block diagram of the utility model embodiment metering circuit of changing gear and range automatically;
Fig. 2 is the main program flow chart that the utility model embodiment changes the metering circuit single-chip microcomputer of gear and range automatically.
Embodiment
Below in conjunction with description of drawings embodiment of the present utility model is described in further detail, but present embodiment is not limited to the utility model, every employing analog structure of the present utility model and similar variation thereof all should be listed protection domain of the present utility model in.
As shown in Figure 1, a kind of automatic conversion gear that the utility model embodiment is provided and the measurement way circuit of range comprise:
One voltage resistance input circuit is composed in series by two RJ15-5M Ω resistance;
One analog switch (CD4052, CD4053) and high pressure resistant light are isolated the MOS on-off circuit, connect the voltage resistance input circuit;
One holding circuit is made up of diode 1N4148 and triode 9013, is used for clamping voltage to make the voltage that is added on the chip in allowed band; Described holding circuit connects voltage resistance input circuit and analog switch and high pressure resistant light respectively and isolates the MOS on-off circuit; By the holding circuit realization input circuit, analog switch and high pressure resistant light are isolated the protection of MOS on-off circuit,
One reference resistance, by high precision, the metalfilmresistor of low-temperature coefficient is formed, and connects analog switch and high pressure resistant light and isolates the MOS on-off circuit;
One buffer circuit, the follower of being made up of amplifier LM358 constitutes, and is used to provide the impedance matching between prime reduction voltage circuit and the ADC, and buffer circuit connects reference resistance;
One A/D convertor circuit is made up of 16 ∑s-Δ type AD converter, is used to realize the conversion of analog to digital, connects buffer circuit;
One frequency measurement circuit, the comparer of being made up of amplifier LM358 constitutes, and comparer becomes digital pulse signal with the analog AC conversion of signals, handles to make things convenient for single-chip microcomputer, and the frequency that records signal is used as judges the foundation that exchanges with direct current signal; Frequency measurement circuit connects buffer circuit;
One automatic zero set (AZS) circuit, form in conjunction with software by analog switch, the automatic zero set (AZS) circuit is realized the offset voltage zeroing of circuit, analog switch CD4053 is with the input end short circuit during zeroing, the voltage that is converted to from AD then is offset voltage Vos, and the data that at every turn obtain from AD during operate as normal deduct Vos can realize zeroing; The automatic zero set (AZS) circuit connects buffer circuit;
One single-chip microcomputer connects analog switch and high pressure resistant light respectively and isolates MOS on-off circuit, frequency measurement circuit, automatic zero set (AZS) circuit, A/D convertor circuit; Be used to discern measured signal, control analog switch and high pressure resistant light are selected suitable reference resistance and input circuit collocation after isolating MOS switch transition measurement gear and measuring range, make it to be fit to the metering circuit measurement, the data holding signal that the reception user imports from keyboard reaches from the AD sense data and is handling video data afterwards;
One display connects single-chip microcomputer;
One button is common trigger-type button, connects single-chip microcomputer, is used to import the data holding signal;
One current transformer can convert the magnitude of current of 1000A to the voltage of 100m V, connects A/D convertor circuit.
During actual measurement, signal is imported from input circuit, surveys the voltage of input signal earlier, if record absolute value of voltage greater than a valve voltage V
f, then instrument and meter is operated in the survey voltage mode, and alternating voltage is by the Single-chip Controlling self-commutation, if the absolute value of voltage that records is less than a valve voltage V
fThen single-chip microcomputer is controlled analog switch and high pressure resistant light automatically and is isolated metal-oxide-semiconductor and switch to resistance grade and measure, then instrument and meter is operated in the measuring resistance pattern, if the resistance that records is high resistant and the resistance measurement scope that surpasses instrument and meter, then carry out voltage measurement ... so go round and begin again, if in this circulation, record binding clip mutual inductor output voltage greater than a certain threshold voltage V
F2, then preferentially measure and show this magnitude of voltage, if this voltage is less than V
F2, then jump into voltage resistance ← → measure circulation.
As shown in Figure 2, the utility model embodiment changes the main program flow of the measurement way circuit single-chip microcomputer of gear and range automatically:
1) system initialization;
2) measuring resistance;
3) greater than 20M Ω? be then to go to 4), otherwise go to 2);
4) show standby interface;
5) detect cell voltage;
6) measure electric current;
7) whether be lower than threshold voltage V
F2Be then to go to 8), otherwise go to 6);
8) survey voltage;
9) whether be lower than threshold voltage V
fBe then to go to 10), otherwise go to 8);
10) show standby interface, go to 2).
The principle of voltage automatic range be displayed value except minimum range and maximum amount journey, all the other ranges if displayed value is less than 19 then jump into a low gear, are jumped into a high gear greater than 1900 generally between 19 ~ 1900.
Resistance grade be divided into into: 20M, 2M, 200k, 20k, 2k, 200 Ω totally 6 gears, and wherein 20M is a gear at the highest level, and 200 Ω are minimum one-level gear.
Claims (6)
1, the measurement way circuit of a kind of automatic conversion gear and range is characterized in that, comprising:
One voltage resistance input circuit;
One analog switch and high pressure resistant light are isolated the MOS on-off circuit, connect the voltage resistance input circuit;
One holding circuit connects voltage resistance input circuit and analog switch and high pressure resistant light respectively and isolates the MOS on-off circuit;
One reference resistance connects analog switch and high pressure resistant light and isolates the MOS on-off circuit;
One A/D convertor circuit is used to realize the conversion of analog to digital, connects reference resistance;
One single-chip microcomputer connects analog switch and high pressure resistant light respectively and isolates MOS on-off circuit, A/D convertor circuit; Be used to discern measured signal, control analog switch and high pressure resistant light are selected suitable reference resistance and input circuit collocation after isolating MOS switch transition measurement gear and measuring range, make it to be fit to the metering circuit measurement; The data holding signal that the reception user imports from keyboard reaches from the AD sense data and is handling video data afterwards;
One display connects single-chip microcomputer.
2, the measurement way circuit of automatic conversion gear according to claim 1 and range is characterized in that, is connected with buffer circuit between described reference resistance and the A/D convertor circuit, is used to provide the impedance matching between prime reduction voltage circuit and the ADC.
3, the measurement way circuit of automatic conversion gear according to claim 2 and range, it is characterized in that, be connected with frequency measurement circuit between described single-chip microcomputer and the buffer circuit, comparer becomes digital pulse signal with the analog AC conversion of signals, to make things convenient for single-chip microcomputer to handle, the frequency that records signal is used as judges the foundation that exchanges with direct current signal.
4, the measurement way circuit of automatic conversion gear according to claim 2 and range, it is characterized in that, be connected with the automatic zero set (AZS) circuit between described single-chip microcomputer and the buffer circuit, by providing bias voltage for voltage and current measurement virtually, the automatic zero set (AZS) circuit is realized the offset voltage zeroing of circuit.
5, the measurement way circuit of automatic conversion gear according to claim 1 and range is characterized in that, described single-chip microcomputer connects button.
6, the measurement way circuit of automatic conversion gear according to claim 1 and range is characterized in that, described A/D convertor circuit connects current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200672235U CN201004072Y (en) | 2007-02-12 | 2007-02-12 | An automatic gear conversion and range measurement circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200672235U CN201004072Y (en) | 2007-02-12 | 2007-02-12 | An automatic gear conversion and range measurement circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201004072Y true CN201004072Y (en) | 2008-01-09 |
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ID=39039613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200672235U Expired - Lifetime CN201004072Y (en) | 2007-02-12 | 2007-02-12 | An automatic gear conversion and range measurement circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201004072Y (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101604004B (en) * | 2009-06-30 | 2011-05-11 | 上海广为电器工具有限公司 | Deep circulation power type storage cell tester |
| CN103616545A (en) * | 2013-11-25 | 2014-03-05 | 国网安徽省电力公司滁州供电公司 | Multifunctional low-voltage testing instrument |
| CN103716033A (en) * | 2013-12-18 | 2014-04-09 | 上海仪电科学仪器股份有限公司 | Method for automatically matching multi-measuring-range switching points |
| CN104316741A (en) * | 2014-07-16 | 2015-01-28 | 武汉振道世纪科技有限公司 | Intelligent universal meter with wide-area measurement and control function and realization method thereof |
| CN104422470A (en) * | 2013-09-03 | 2015-03-18 | 北京谊安医疗系统股份有限公司 | Coordinate switching method for waveform drawing |
| CN105092928A (en) * | 2015-07-23 | 2015-11-25 | 高超 | Digital clamp meter and automatic measurement method |
| CN105929282A (en) * | 2016-06-02 | 2016-09-07 | 国网宁夏电力公司吴忠供电公司 | Transformer tap position adjustment loop testing device |
| CN104237619B (en) * | 2014-07-07 | 2018-07-06 | 武汉振道世纪科技有限公司 | Intelligent general-purpose An Fubiao |
| CN110568252A (en) * | 2019-08-29 | 2019-12-13 | 桂林电子科技大学 | four-channel double-gear interface control circuit current detection system |
| CN112147391A (en) * | 2020-09-10 | 2020-12-29 | 国网江西省电力有限公司电力科学研究院 | Range self-adaptive power measuring device and method with high safety |
| CN113189959A (en) * | 2021-04-15 | 2021-07-30 | 常州易控汽车电子股份有限公司 | Test circuit and test method of drive circuit |
| CN116338324A (en) * | 2023-05-30 | 2023-06-27 | 深圳市鼎阳科技股份有限公司 | Resistance measurement circuit, method, universal meter and storage medium |
-
2007
- 2007-02-12 CN CNU2007200672235U patent/CN201004072Y/en not_active Expired - Lifetime
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101604004B (en) * | 2009-06-30 | 2011-05-11 | 上海广为电器工具有限公司 | Deep circulation power type storage cell tester |
| CN104422470A (en) * | 2013-09-03 | 2015-03-18 | 北京谊安医疗系统股份有限公司 | Coordinate switching method for waveform drawing |
| CN103616545A (en) * | 2013-11-25 | 2014-03-05 | 国网安徽省电力公司滁州供电公司 | Multifunctional low-voltage testing instrument |
| CN103716033A (en) * | 2013-12-18 | 2014-04-09 | 上海仪电科学仪器股份有限公司 | Method for automatically matching multi-measuring-range switching points |
| CN104237619B (en) * | 2014-07-07 | 2018-07-06 | 武汉振道世纪科技有限公司 | Intelligent general-purpose An Fubiao |
| CN104316741A (en) * | 2014-07-16 | 2015-01-28 | 武汉振道世纪科技有限公司 | Intelligent universal meter with wide-area measurement and control function and realization method thereof |
| US10267823B2 (en) | 2015-07-23 | 2019-04-23 | Shenzhen New Huayi Instrument Co., Ltd. | Digital clamp meter and automatic measurement method thereof |
| CN105092928B (en) * | 2015-07-23 | 2018-04-20 | 深圳市华谊智测科技股份有限公司 | Digital split-core type meter and its method for automatic measurement |
| CN105092928A (en) * | 2015-07-23 | 2015-11-25 | 高超 | Digital clamp meter and automatic measurement method |
| CN105929282A (en) * | 2016-06-02 | 2016-09-07 | 国网宁夏电力公司吴忠供电公司 | Transformer tap position adjustment loop testing device |
| CN110568252A (en) * | 2019-08-29 | 2019-12-13 | 桂林电子科技大学 | four-channel double-gear interface control circuit current detection system |
| CN112147391A (en) * | 2020-09-10 | 2020-12-29 | 国网江西省电力有限公司电力科学研究院 | Range self-adaptive power measuring device and method with high safety |
| CN113189959A (en) * | 2021-04-15 | 2021-07-30 | 常州易控汽车电子股份有限公司 | Test circuit and test method of drive circuit |
| CN116338324A (en) * | 2023-05-30 | 2023-06-27 | 深圳市鼎阳科技股份有限公司 | Resistance measurement circuit, method, universal meter and storage medium |
| CN116338324B (en) * | 2023-05-30 | 2023-07-25 | 深圳市鼎阳科技股份有限公司 | Resistance measurement circuit, method, universal meter and storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080109 |
|
| CX01 | Expiry of patent term |