CN201926702U - Electronic alternating-current millivolt meter - Google Patents
Electronic alternating-current millivolt meter Download PDFInfo
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- CN201926702U CN201926702U CN2010205886463U CN201020588646U CN201926702U CN 201926702 U CN201926702 U CN 201926702U CN 2010205886463 U CN2010205886463 U CN 2010205886463U CN 201020588646 U CN201020588646 U CN 201020588646U CN 201926702 U CN201926702 U CN 201926702U
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Abstract
The utility model discloses an electronic alternating-current millivolt meter relating to the technical field of electronics. As for the electronic alternating-current millivolt meter, an inputted voltage of 10-1000mV passes through an amplifier of an operation-amplification circuit, so that a voltage signal is amplified to 0-5V; then a peak-value detection circuit is adopted and a peak value is extracted from a sinusoidal signal; and a direct-current signal is sampled by a converter chip and then displayed by a three-position digital tube. The electronic alternating-current millivolt meter can conduct accurate measurement with automatic switching of a measurement range on the voltage in the voltage range of 0-100mV, avoid the trouble of switching the measurement range, and prevent the instrument from being damaged by the wrong switching of the measurement range. In design, the electronic alternating-current millivolt meter adopts the three-position digital tube for display and effectively avoids the measurement error caused by reading from analog display. The electronic alternating-current millivolt meter saves energy consumption due to small and exquisite volume, is fast in movement, simple in structure, convenient to operate and broad in application prospect.
Description
Technical field
The utility model belongs to electronic instrument technology field, is specifically related to a kind of alternating electron milivoltmeter.
Background technology
Run into through regular meeting in industrial processes and detect millivolt even littler voltage signal, though digital multimeter generally all has the millivolt shelves now, range mostly is 200mV, and precision is lower, is difficult to satisfy greater than the 100mV measurement requirement.
Summary of the invention
The purpose of this utility model is for the deficiency that solves the problems of the technologies described above, and a kind of a kind of alternating electron milivoltmeter simple in structure, multiple range is provided.
The utility model to achieve these goals, the technical scheme that is adopted is: a kind of alternating electron milivoltmeter is provided, it is characterized in that: described alternating electron milivoltmeter comprises, the tested voltage of importing of 10～1000mV is zoomed into 0～5V through the amplifier of discharge circuit with voltage signal; Adopt peak-detector circuit then, from sinusoidal signal, extract peak value, direct current signal is sampled, show through three charactrons through converter chip.
The described voltage of exporting through the amplifier of discharge circuit is divided into four ranges, is respectively: 0.3-1 (* 4); (0.01-0.4 * 10); (0.03-0.01 * 40); (0.01-0.04 * 100).
Described employing peak-detector circuit, when Ui＞Uc, diode D2 conducting, Ui is to capacitor C 1 charging, and charging rate is that t=RdC is very little, and charge rate is very fast, Uc=Ui; When Ui＜Uc, diode D2 ends, and the Uc magnitude of voltage keeps.
A kind of its beneficial effect of alternating electron milivoltmeter described in the utility model is: described a kind of alternating electron milivoltmeter is based on the digital voltmeter of the automatic conversion of range of STC89C52 single-chip microcomputer, with LM318, TLC549 is that core devices adopts operational amplifier and integrated multipath analog switching circuit to design voltage table range automatic switchover technology, constitute complete measuring system, can carry out the range accurate measurement of conversion automatically to the voltage of 0～1000mV voltage range, save the trouble of range conversion, also avoided the instrument damage that causes because of the range handoff error.This design adopts three charactrons to show, has avoided simulation to show the measuring error that reading brought effectively.In the design process,, reduced the measuring error of instrument effectively, improved the precision of instrument, reached application requirements substantially through calculating in a large number and accurately.This design is small and exquisite because of its volume, energy efficient, and action is quick, and is simple in structure, easy to operate and have a extensive future.
Description of drawings
Fig. 1 a kind of alternating electron milivoltmeter structural representation described in the utility model.
Fig. 2 a kind of alternating electron milivoltmeter principle schematic described in the utility model.
Fig. 3 a kind of alternating electron milivoltmeter circuit diagram described in the utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing a kind of alternating electron milivoltmeter described in the utility model is described.
As shown in Figure 1:
A kind of alternating electron milivoltmeter, described alternating electron milivoltmeter comprise, the tested voltage of importing of 10～1000mV is zoomed into 0～5V through the amplifier of discharge circuit with voltage signal; Adopt peak-detector circuit then, from sinusoidal signal, extract peak value, direct current signal is sampled, show through three charactrons through converter chip.
The described voltage of exporting through the amplifier of discharge circuit is divided into four ranges, is respectively: 0.3-1 (* 4); (0.01-0.4 * 10); (0.03-0.01 * 40); (0.01-0.04 * 100).
Described employing peak-detector circuit, when Ui＞Uc, diode D2 conducting, Ui is to capacitor C 1 charging, and charging rate is that t=RdC is very little, and charge rate is very fast, Uc=Ui; When Ui＜Uc, diode D2 ends, and the Uc magnitude of voltage keeps.
Specific design is repeatedly to have adopted emitter follower in the hardware circuit design on basis.The driving force of considering single-chip microcomputer is very little, has added 8550 and be used for driving LED and show in design.Whole underlying hardware system mainly consists of the following components:
(1) voltage signal amplifying circuit: the tested voltage signal of 10～1000m V that will import zooms into 0～5V.
(2) detecting circuit: from sinusoidal signal, extract peak value.
(3) A/D sampling: adopt the TLC549 chip that direct current signal is sampled.
(4) data processing and demonstration: the single-chip microcomputer sampling, select suitable range automatically, show with three charactrons.
Because the requirement of precision, selected the typical circuit of three grades of instrumentation amplifiers, through the Multisim test, input impedance 30Hz-300kHz in specified frequency reaches more than the M Ω, basically can meet the requirements, need not to utilize boostrap circuit to improve input impedance, unity gain bandwidth is about MHz, and amplitude versus frequency characte needs improvement, the mode of amplifier cascade is adopted in decision for this reason, adopt two-stage cascade, on total basic basis of invariable of gain amplifier, bandwidth meets the requirements basically.
The sinusoidal wave 10mv-1v that is input as, because the restriction of amplifier itself, output voltage can not be above the operating voltage (maximal value 15v) of amplifier.And the input voltage of AD sampling is 0～5v, and requiring can not be too big through post-detector voltage, considers the precision of A D sampling, knows that by experience input voltage is preferably in 1～4v.Therefore, adopt the mode of dividing range, it is divided into for overcoming the above problems final decision
0.3-1(×4)；
0.01-0.4(×10)；
0.03-0.01(×40)；
0.01-0.04(×100)
Four ranges adopt CD4052 simulation multidiameter option switch, and with the enlargement factor of programmed control selective amplifier, suitable range is selected in control automatically, thereby improves the degree of accuracy of AD conversion, as shown in Figure 2.
Demodulator probe adopts peak-detector circuit, when Ui＞Uc, and diode D2 conducting, Ui is to capacitor C 1 charging, and charging rate is that t=RdC is very little, and charge rate is very fast, Uc=Ui; When Ui＜Uc, diode D2 ends, and the Uc magnitude of voltage keeps.Obviously output voltage is followed the peak value of signal and is become, and the maximal value of holding signal.Switch S in the circuit is as circuit reset.Amplifier U3A constitutes the homophase follower and cuts off being connected of electric capacity and back circuit, prevent capacitor discharge and only transfer overvoltage to the AD sample circuit of back.
TLC549 is 8 bits serial A/D converter chip that TIX produces, and can carry out serial line interface by CLK, CS, DATA OUT three Tiaokou lines with general purpose microprocessor, controller.Have system clock and soft, hardware control circuit in the 4MHz sheet, switching time the longest 17 μ s, the high conversion rate that TLC549 allows is 40000 times/s.Error is 0.5LSB, is
About 9.8mV.So need to reduce measuring error by amplifying small-signal.
Because the restriction (preamble is mentioned) of AD sampled voltage scope requires to divide the range design, we adopt the design of single-chip microcomputer automatic control amount journey, utilize simulation multidiameter option switch 4052, select suitable amplifying circuit enlargement factor, the control output voltage scope.
Multidiameter option switch 4052 is to control a road among 4 road X0-X4 and main road X gating by BA two bits, we are connected with control end BA with 2 I/O mouths of 89C52 single-chip microcomputer, the resistance that utilizes program to control which decision enlargement factor inserts amplifying circuit, thereby the control enlargement factor has also just realized the design of branch range.And judge whether range is suitable behind the signal sampling that single-chip microcomputer passes through initial range is handled, decision is to change range or output demonstration, has so just realized the automatic range control design.
Display circuit has adopted the method for simple Single-chip Controlling output, and digital pipeline section is selected the P0 mouth that terminates at single-chip microcomputer, and three positions select signal wel1, wel2, wel3 to connect P2.2, P2.1, the P2.0 mouth of single-chip microcomputer respectively.Charactron adopts the positive-negative-positive triode to drive, and selects common anode type for use.
Circuit part as described in Figure 3.
The software design part: sample in advance earlier, judge it whether in maximum range by program, if image data and being exported then, otherwise select next range to judge again.Numeral is 3, by the position of programmed control radix point.
The above; it only is the preferable embodiment of the utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; be equal to replacement or change according to the technical solution of the utility model and utility model design thereof, all should be encompassed within the protection domain of the present utility model.
Claims (3)
1. alternating electron milivoltmeter, it is characterized in that: the tested voltage of 10～1000mV that described alternating electron milivoltmeter will be imported zooms into 0～5V through the amplifier of discharge circuit with voltage signal; Adopt peak-detector circuit then, from sinusoidal signal, extract peak value, direct current signal is sampled, show through three charactrons through converter chip.
2. a kind of alternating electron milivoltmeter according to claim 1 is characterized in that: the described voltage of exporting through the amplifier of discharge circuit is divided into four ranges, is respectively: 0.3-1 (* 4); (0.01-0.4 * 10); (0.03-0.01 * 40); (0.01-0.04 * 100).
3. a kind of alternating electron milivoltmeter according to claim 1 is characterized in that: described employing peak-detector circuit, and when Ui＞Uc, diode D2 conducting, Ui is to capacitor C 1 charging, and charging rate is that t=RdC is very little, and charge rate is very fast, Uc=Ui; When Ui＜Uc, diode D2 ends, and the Uc magnitude of voltage keeps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205886463U CN201926702U (en) | 2010-10-29 | 2010-10-29 | Electronic alternating-current millivolt meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205886463U CN201926702U (en) | 2010-10-29 | 2010-10-29 | Electronic alternating-current millivolt meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201926702U true CN201926702U (en) | 2011-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010205886463U Expired - Fee Related CN201926702U (en) | 2010-10-29 | 2010-10-29 | Electronic alternating-current millivolt meter |
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| CN (1) | CN201926702U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102917473A (en) * | 2012-10-16 | 2013-02-06 | 上海理工大学 | Wireless illuminometer |
| CN103323638A (en) * | 2013-07-05 | 2013-09-25 | 无锡商业职业技术学院 | Multifunctional digital scope meter |
| CN106338639A (en) * | 2015-07-06 | 2017-01-18 | 河北工业大学 | Pulse peak voltage measurement and display device |
-
2010
- 2010-10-29 CN CN2010205886463U patent/CN201926702U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102917473A (en) * | 2012-10-16 | 2013-02-06 | 上海理工大学 | Wireless illuminometer |
| CN103323638A (en) * | 2013-07-05 | 2013-09-25 | 无锡商业职业技术学院 | Multifunctional digital scope meter |
| CN106338639A (en) * | 2015-07-06 | 2017-01-18 | 河北工业大学 | Pulse peak voltage measurement and display device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110810 Termination date: 20111029 |