CN103336169B - D.C. voltmeter and apply the method that this voltage table carries out voltage measurement - Google Patents
D.C. voltmeter and apply the method that this voltage table carries out voltage measurement Download PDFInfo
- Publication number
- CN103336169B CN103336169B CN201310250900.7A CN201310250900A CN103336169B CN 103336169 B CN103336169 B CN 103336169B CN 201310250900 A CN201310250900 A CN 201310250900A CN 103336169 B CN103336169 B CN 103336169B
- Authority
- CN
- China
- Prior art keywords
- voltage
- program
- voltmeter
- voltage source
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a kind of D.C. voltmeter and apply the method that this voltage table carries out voltage measurement, relate to electrical measurement instrument technical field, comprise the MCU as master controller, also comprise the program-controlled voltage source module and current detection module that carry out Signal transmissions respectively with described MCU, MCU controls the voltage signal of described program-controlled voltage source module exporting change according to the signal that described current detection module transmits, this voltage signal increases gradually, when carrying out voltage measurement, the internal resistance of D.C. voltmeter can be made to be equivalent to infinity.Visible, D.C. voltmeter of the present invention solves electrical measurement instrument in prior art and measures electric current and the inaccurate technical matters of voltage.D.C. voltmeter of the present invention, when carrying out voltage measurement, can not be treated metering circuit and have any impact, and can measure the magnitude of voltage of circuit to be measured accurately.
Description
Technical field
The present invention relates to electrical measurement instrument technical field, particularly a kind of D.C. voltmeter and apply the method that this voltage table carries out voltage measurement.
Background technology
Electrical measurement comprises the measurement to electric current, voltage, power and electric energy etc., and wherein voltage is electricity the most basic in electrotechnical measurement.At present when measuring voltage, what generally adopt is that voltage table or multimeter are measured.
Existing equipment, when the voltage of metering circuit point-to-point transmission, needs by instrument parallel connection between two points.Internal resistance due to instrument is not infinitely great, and this is just equivalent to a limited large resistance in parallel between two measurement points.This resistance is also the electric current that will consume circuit to be measured, although this electric current is very little, the accuracy of measurement generally can not be had influence on, in some special cases, as the resistance of circuit to be measured differ less with the internal resistance of instrument time, the result measured just there will be deviation.As shown in Figure 1, when instrument not being parallel to two measurement point of circuit, point-to-point transmission voltage is 2V; During with voltage between instrument measurement two measurement point, measured value is 1.5V.This is because the internal resistance of instrument needs current sinking, cause measurement result mistake.
Summary of the invention
First technical matters to be solved by this invention is to provide a kind of D.C. voltmeter, and when carrying out current measurement with this D.C. voltmeter, its equivalent internal resistance is infinitely great, treats metering circuit and does not have an impact, can measure circuit voltage accurately.
Based on a total inventive concept, second technical matters to be solved by this invention is to provide a kind ofly applies the method that above-mentioned D.C. voltmeter carries out voltage measurement, and this voltage measurement method can measure circuit voltage accurately.
For solving above-mentioned first technical matters, technical scheme of the present invention is:
A kind of D.C. voltmeter, comprise the first signal input part for being connected with the measurement point of circuit to be measured and secondary signal input end, also comprise: master controller MCU, be electrically connected with program-controlled voltage source module and current detection module, the signal for transmitting according to described current detection module controls described program-controlled voltage source module output voltage signal; Described program-controlled voltage source module, for the voltage signal of the signal exporting change according to described MCU, two output terminals of described program-controlled voltage source module are electrically connected the first signal input part and secondary signal input end respectively; Described current detection module, give described MCU for the current signal transfer that will detect, described current detection module is in series with resistance R, and described current detection module connect with described resistance R afterwards and described program-controlled voltage source wired in parallel; Power module, for powering to described D.C. voltmeter, described power module is electrically connected described MCU.
Wherein, described D.C. voltmeter also comprises the display module for showing magnitude of voltage, and described display module is electrically connected described MCU.
Wherein, described program-controlled voltage source module is program-controlled voltage source device or program-controlled voltage source circuit.
For solving above-mentioned second technical matters, technical scheme of the present invention is:
Apply the method that above-mentioned D.C. voltmeter carries out DC voltage measurement, comprise the following steps: S1, described D.C. voltmeter is parallel in circuit to be measured; S2, described current detection module sensed current signal, and give described MCU by the current signal transfer that detects; The current signal that S3, described MCU transmit according to described current detection module judges voltage direction, then control described program-controlled voltage source module and export the voltage U identical with described voltage direction, described voltage U increases gradually, until the electric current that described current detection module detects equals U/ (R+r) just, wherein: the magnitude of voltage that program-controlled voltage source module described in U=exports, the equivalent resistance of program-controlled voltage source module circuitry upper conductor described in r=and the internal resistance sum of described current detection module; The magnitude of voltage of S4, circuit to be measured is the magnitude of voltage U that described program-controlled voltage source module when electric current equals U/ (R+r) just exports, and MCU controls a display module display magnitude of voltage U.
After have employed technique scheme, the invention has the beneficial effects as follows:
Because D.C. voltmeter of the present invention comprising the first signal input part for being connected with the measurement point of circuit to be measured and secondary signal input end, also comprising: MCU, being electrically connected with program-controlled voltage source module and current detection module; Two output terminal strings of program-controlled voltage source module are electrically connected the first signal input part and secondary signal input end respectively; Current detection module is in series with resistance R, and current detection module is connected with resistance R afterwards and program-controlled voltage source wired in parallel.When carrying out voltage measurement, D.C. voltmeter is parallel in circuit to be measured, MCU can judge the direction of voltage according to the signal that current detection module transmission comes, then the voltage U that program-controlled voltage source module outbound course is identical is controlled, voltage U increases gradually, until the electric current that current detection module detects equals U/ (R+r) just, r be the internal resistance of current detection module and the equivalent resistance of program-controlled voltage source circuit upper conductor and, now D.C. voltmeter provides electric current to circuit to be measured, the electric current of circuit to be measured is not consumed yet, namely the equivalent internal resistance of D.C. voltmeter is infinitely great, do not treat metering circuit to impact, thus the magnitude of voltage of circuit to be measured can be measured accurately.
Visible, D.C. voltmeter of the present invention solves electrical measurement instrument in prior art and measures electric current and the inaccurate technical matters of voltage.D.C. voltmeter of the present invention, when carrying out voltage measurement, can not be treated metering circuit and have any impact, and can measure the magnitude of voltage of circuit to be measured accurately.
Accompanying drawing explanation
Fig. 1 is DC voltage measurement schematic diagram;
Fig. 2 is the structured flowchart of direct current baric flow table of the present invention.
Embodiment
Below in conjunction with drawings and Examples, set forth the present invention further.
As shown in Figure 2, a kind of D.C. voltmeter, comprise shell, shell is provided with the first signal input part 100 for being connected with the measurement point of circuit to be measured and secondary signal input end 101, first signal input part 100 and can be connected with secondary signal input end 101 and measures test pencil or measure wire clamp.Be provided with master controller MCU in shell, MCU is electrically connected with program-controlled voltage source module and current detection module A.Two output terminals of program-controlled voltage source module are electrically connected the first signal input part 100 and secondary signal input end 101 respectively.Current detection module A is in series with resistance R, and current detection module A connects with resistance R afterwards and program-controlled voltage source wired in parallel.MCU is also electrically connected with the power module for powering to D.C. voltmeter, and power supply can adopt dry cell or rechargeable battery.MCU is also electrically connected with display module, and display module is for showing the magnitude of voltage recorded.
Program-controlled voltage source module can adopt complete program-controlled voltage source device, receives only the enable of MCU and voltage direction control signal, oneself controls to export stepped voltage; May also be and only adopt program-controlled voltage source circuit, not only control enable and voltage direction by MCU, also controlled to export stepped voltage by MCU.The precision of program-controlled voltage source module is more high better, and the less measured value of stepped voltage is more accurate.
The resistance of resistance R is less in theory, and test result is more accurate, but the power consumption of D.C. voltmeter can be higher, therefore in actual applications should according to the resistance R of the relatively little resistance of the measurement range selection of D.C. voltmeter.
The principle of work of D.C. voltmeter of the present invention is as follows:
When measuring voltage, D.C. voltmeter is connected in parallel in circuit to be tested, MCU judges the direction of voltage according to the current signal that current detection module A transmits, then control program-controlled voltage source module and export a voltage U identical with this voltage direction, the ascending change of voltage U, until the electric current that current detection module A measures equals U/ (R+r) just, r be the internal resistance of current detection module A and the equivalent resistance of program-controlled voltage source circuit upper conductor and.Now voltage table provides electric current to circuit to be measured, the electric current of circuit to be measured is not consumed yet, namely the equivalent internal resistance of voltage table is infinitely great, do not treat metering circuit to impact, the voltage that D.C. voltmeter two ends record is exactly the accurate voltage of circuit to be measured, equal with the output voltage U of program-controlled voltage source, then control display module by MCU and demonstrate magnitude of voltage, thus the magnitude of voltage of circuit to be measured can be measured accurately.
When program-controlled voltage source module exports different voltage, the electric current that current detection module A detects equals U/ (R+r) always, then display module display measurement voltage is 0V.
Apply the method that above-mentioned D.C. voltmeter carries out DC voltage measurement, comprise the following steps:
S1, D.C. voltmeter is parallel in circuit to be measured;
S2, current detection module A sensed current signal, and by the current signal transfer that detects to MCU;
The current signal that S3, MCU transmit according to current detection module A judges voltage direction, then control program-controlled voltage source module and export the voltage U identical with the voltage direction recorded, voltage U is changed from small to big, until the electric current that current detection module A detects equals U/ (R+r) just, wherein: U is the magnitude of voltage that program-controlled voltage source module exports, and r is the equivalent resistance of program-controlled voltage source module circuitry upper conductor and the internal resistance sum of current detection module A;
The magnitude of voltage of S4, circuit to be measured is the magnitude of voltage U of program-controlled voltage source module output, and MCU controls display module display magnitude of voltage U.
This DC voltage measurement method can measure circuit voltage accurately.
The present invention is not limited to above-mentioned concrete embodiment, and those of ordinary skill in the art is from above-mentioned design, and without performing creative labour, done all conversion, all drop within protection scope of the present invention.
Claims (4)
1. D.C. voltmeter, comprising the first signal input part for being connected with the measurement point of circuit to be measured and secondary signal input end, it is characterized in that, also comprise:
Master controller MCU, is electrically connected with program-controlled voltage source module and current detection module, and the signal for transmitting according to described current detection module controls described program-controlled voltage source module output voltage signal;
Described program-controlled voltage source module, for the voltage signal of the signal exporting change according to described MCU, two output terminals of described program-controlled voltage source module are electrically connected the first signal input part and secondary signal input end respectively;
Described current detection module, give described MCU for the current signal transfer that will detect, described current detection module is in series with resistance R, and described current detection module connect with described resistance R afterwards and described program-controlled voltage source wired in parallel;
Power module, for powering to described D.C. voltmeter, described power module is electrically connected described MCU.
2. D.C. voltmeter according to claim 1, is characterized in that, described D.C. voltmeter also comprises the display module for showing magnitude of voltage, and described display module is electrically connected described MCU.
3. D.C. voltmeter according to claim 2, is characterized in that, described program-controlled voltage source module is program-controlled voltage source device or program-controlled voltage source circuit.
4. application rights requires that the D.C. voltmeter described in 1 carries out the method for DC voltage measurement, it is characterized in that, comprises the following steps:
S1, described D.C. voltmeter is parallel in circuit to be measured;
S2, described current detection module sensed current signal, and give described MCU by the current signal transfer that detects;
The current signal that S3, described MCU transmit according to described current detection module judges voltage direction, then control described program-controlled voltage source module and export the voltage U identical with described voltage direction, described voltage U increases gradually, until the electric current that described current detection module detects equals U/ (R+r) just, wherein:
The magnitude of voltage that program-controlled voltage source module described in U=exports,
The equivalent resistance of program-controlled voltage source module circuitry upper conductor described in r=and the internal resistance sum of described current detection module;
The magnitude of voltage of S4, circuit to be measured is the magnitude of voltage U that described program-controlled voltage source module when electric current equals U/ (R+r) just exports, and MCU controls a display module display magnitude of voltage U.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310250900.7A CN103336169B (en) | 2013-06-22 | 2013-06-22 | D.C. voltmeter and apply the method that this voltage table carries out voltage measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310250900.7A CN103336169B (en) | 2013-06-22 | 2013-06-22 | D.C. voltmeter and apply the method that this voltage table carries out voltage measurement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103336169A CN103336169A (en) | 2013-10-02 |
| CN103336169B true CN103336169B (en) | 2015-07-29 |
Family
ID=49244372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310250900.7A Active CN103336169B (en) | 2013-06-22 | 2013-06-22 | D.C. voltmeter and apply the method that this voltage table carries out voltage measurement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103336169B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102033157A (en) * | 2010-11-05 | 2011-04-27 | 漳州国绿太阳能科技有限公司 | Direct current micro voltage/micro current detection device and detection method thereof |
| CN202421315U (en) * | 2011-12-28 | 2012-09-05 | 童淮安 | Intelligent electric power measuring and controlling instrument |
| CN202710651U (en) * | 2012-06-14 | 2013-01-30 | 北京科易动力科技有限公司 | Device for measuring direct voltage and current |
| CN203287428U (en) * | 2013-06-22 | 2013-11-13 | 青岛歌尔声学科技有限公司 | Direct current voltmeter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4374729B2 (en) * | 2000-05-16 | 2009-12-02 | ヤマハ株式会社 | Current measurement circuit, current consumption measurement circuit, and charge / discharge current measurement circuit |
-
2013
- 2013-06-22 CN CN201310250900.7A patent/CN103336169B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102033157A (en) * | 2010-11-05 | 2011-04-27 | 漳州国绿太阳能科技有限公司 | Direct current micro voltage/micro current detection device and detection method thereof |
| CN202421315U (en) * | 2011-12-28 | 2012-09-05 | 童淮安 | Intelligent electric power measuring and controlling instrument |
| CN202710651U (en) * | 2012-06-14 | 2013-01-30 | 北京科易动力科技有限公司 | Device for measuring direct voltage and current |
| CN203287428U (en) * | 2013-06-22 | 2013-11-13 | 青岛歌尔声学科技有限公司 | Direct current voltmeter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103336169A (en) | 2013-10-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102590609B (en) | The method of mobile terminal and measurement mobile terminal power consumption | |
| CN101251585A (en) | Method and apparatus for checking global error of high voltage energy metering installation | |
| CN104062507A (en) | Battery internal resistance measuring instrument | |
| CN204215023U (en) | Terminal charge parameter testing line | |
| CN201344948Y (en) | Test instrument | |
| CN204302347U (en) | Microcomputer-recognized intelligent universal meter | |
| CN105785131A (en) | Testing device and method for low ohm chip resistors | |
| CN201311485Y (en) | Ripple factor detecting device adapted to DC power supply | |
| CN103293362B (en) | DC ammeter and multimeter and apply the measuring method of this reometer or multimeter | |
| CN103078363A (en) | Battery cell identification circuit and identification method thereof | |
| CN103630729A (en) | One-step wiring device and method for testing 1000kV lightning arrester reference voltage and leakage current | |
| CN202815193U (en) | Battery test device | |
| CN204228946U (en) | A kind of electric energy meter error calibrating installation | |
| CN203287428U (en) | Direct current voltmeter | |
| CN103336169B (en) | D.C. voltmeter and apply the method that this voltage table carries out voltage measurement | |
| CN203287422U (en) | Direct current ammeter and universal meter | |
| CN202393834U (en) | Precise ohmic internal resistance measurer for battery | |
| CN102116825A (en) | Electric property comprehensive tester for solar junction box | |
| CN204649838U (en) | Charging pile charge metering verifying attachment | |
| CN203422878U (en) | Electricity comprehensive experimental instrument integrated case | |
| CN202854215U (en) | Inductive test pencil based on six-inverter integrated circuit | |
| CN204650860U (en) | A kind of modulus electricity experiment table | |
| CN201845072U (en) | Portable wide-range detection device for voltage-regulating value of voltage-regulator tube | |
| CN202013381U (en) | Partial pressure resistor measuring unit | |
| CN203551643U (en) | One-time wiring apparatus for testing reference voltage and leakage current of 1000-kV lightning arrester |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |