CN203287428U - Direct current voltmeter - Google Patents
Direct current voltmeter Download PDFInfo
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- CN203287428U CN203287428U CN2013203624328U CN201320362432U CN203287428U CN 203287428 U CN203287428 U CN 203287428U CN 2013203624328 U CN2013203624328 U CN 2013203624328U CN 201320362432 U CN201320362432 U CN 201320362432U CN 203287428 U CN203287428 U CN 203287428U
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Abstract
The utility model discloses a direct current voltmeter, and relates to the technical field of electric quantity measuring meters. The direct current voltmeter comprises an MCU which acts as a controller, and also comprises a program control voltage source module and a current detection module which perform signal transmission with the MCU, the MCU controls the program control voltage source module to output a changed voltage signal according to a signal transmitted from the current detection module, the voltage signal gradually increases, and in voltage measurement, the internal resistance of the direct current voltmeter is equivalent to infinity. It is thus clear that the direct current voltmeter in the utility model solves the technical problem that current and voltage measurement by an electric quantity measuring meter in the prior art is inaccurate. In voltage measurement, the direct current voltmeter in the utility model does not have any influence on a circuit to be measured, and can accurately measure the voltage value of the circuit to be measured.
Description
Technical field
The utility model relates to electrical measurement instrument technical field, particularly a kind of D.C. voltmeter.
Background technology
Electrical measurement comprises that wherein voltage is electric weight the most basic in electrotechnical measurement to the measurement of electric current, voltage, power and electric energy etc.When measuring voltage, what generally adopt is that voltage table or multimeter are measured at present.
Existing equipment when the voltage of metering circuit point-to-point transmission, need to be connected in parallel on instrument between 2.Because the internal resistance of instrument is not infinitely great, this just is equivalent to 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, generally can not have influence on the accuracy of measurement, in the situation that some are special, differ hour as the internal resistance of the resistance of circuit to be measured and instrument, the result of measuring just there will be deviation.As shown in Figure 1, while instrument not being parallel to two measurement point of circuit, point-to-point transmission voltage is 2V; During with the voltage between instrument measurement two measurement points, measured value is 1.5V.This is because the internal resistance of instrument needs current sinking, causes the measurement result mistake.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of D.C. voltmeter, and while with this D.C. voltmeter, carrying out current measurement, its equivalent internal resistance is infinitely great, treats metering circuit and does not exert an influence, and can measure accurately circuit voltage.
For solving the problems of the technologies described above, the technical solution of the utility model is:
A kind of D.C. voltmeter, comprise for the first signal input end that is 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, be used for the described program-controlled voltage source module of the signal controlling output voltage signal that transmits according to described current detection module; Described program-controlled voltage source module, be used for the voltage signal according to the signal exporting change of described MCU, and two output terminals of described program-controlled voltage source module are electrically connected to respectively first signal input end and secondary signal input end; Described current detection module, be used for the current signal transfer that will detect to described MCU, and described current detection module is in series with resistance R, and is in parallel with described program-controlled voltage source module after described current detection module is connected with described resistance R; Power module, be used for to described D.C. voltmeter power supply, and described power module is electrically connected to described MCU.
Wherein, described D.C. voltmeter also comprises that for the display module that shows magnitude of voltage, described display module is electrically connected to described MCU.
Wherein, described program-controlled voltage source module is program-controlled voltage source device or program-controlled voltage source circuit.
After having adopted technique scheme, the beneficial effects of the utility model are:
, because the utility model D.C. voltmeter comprises for the first signal input end that is connected with the measurement point of circuit to be measured and secondary signal input end, also comprise: MCU is 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 to respectively first signal input end and secondary signal input end; Current detection module is in series with resistance R, and is in parallel with the program-controlled voltage source module after current detection module is connected with resistance R.when carrying out voltage measurement, D.C. voltmeter is parallel in circuit to be measured, the MCU signal that transmission comes according to current detection module can be judged the direction of voltage, then control the identical voltage U of program-controlled voltage source module outbound course, 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 program-controlled voltage source circuit upper conductor equivalent resistance and, this moment, multimeter provided electric current for circuit to be measured, do not consume the electric current of circuit to be measured yet, the equivalent internal resistance that is multimeter is infinitely great, not treating metering circuit impacts, thereby can measure accurately the magnitude of voltage of circuit to be measured.
As seen, the utility model D.C. voltmeter has solved electrical measurement instrument in prior art and has measured electric current and the inaccurate technical matters of voltage.The utility model D.C. voltmeter when carrying out voltage measurement, can not treated metering circuit and have any impact, and can measure accurately the magnitude of voltage of circuit to be measured.
Description of drawings
Fig. 1 is the dc voltage measurement schematic diagram;
Fig. 2 is the structured flowchart of the utility model direct current baric flow table.
Embodiment
, below in conjunction with drawings and Examples, further set forth the utility model.
As shown in Figure 2, a kind of D.C. voltmeter, comprise shell, shell is provided with for the first signal input end 100 that is connected with the measurement point of circuit to be measured and secondary signal input end 101, and first signal input end 100 is connected with the secondary signal input end can connect measurement test pencil or measurement 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 to respectively first signal input end 100 and secondary signal input end 101.Current detection module A is in series with resistance R, and is in parallel with the program-controlled voltage source module after current detection module A connects with resistance R.MCU also is electrically connected with for the power module to the D.C. voltmeter power supply, and power supply can adopt dry cell or rechargeable battery.MCU also is electrically connected with display module, and display module is used for showing the magnitude of voltage that records.
The program-controlled voltage source module can adopt complete program-controlled voltage source device, receives only enabling and the voltage direction control signal of MCU, oneself controls the output stepped voltage; But also only adopt the program-controlled voltage source circuit, not only by MCU, control and enable and voltage direction, also by MCU, control the output stepped voltage.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 be according to the resistance R of the measurement range selection less resistance of D.C. voltmeter.
The principle of work of the utility model D.C. voltmeter is as follows:
When measuring voltage, D.C. voltmeter is connected in parallel in circuit to be tested, the current signal that MCU transmits according to current detection module A is judged the direction of voltage, then control voltage U identical with this voltage direction of program-controlled voltage source module output, the ascending variation 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 program-controlled voltage source circuit upper conductor equivalent resistance and.This moment, voltage table provided electric current for circuit to be measured, do not consume the electric current of circuit to be measured yet, the equivalent internal resistance that is voltage table is infinitely great, not treating metering circuit impacts, the voltage that the D.C. voltmeter two ends record is exactly the accurate voltage of circuit to be measured, equate with the output voltage U of program-controlled voltage source, then by MCU, control display module and demonstrate magnitude of voltage, thereby can measure accurately the magnitude of voltage of circuit to be measured.
When the different voltage of program-controlled voltage source module output, the electric current that current detection module A detects equals U/ (R+r) always, and display module display measurement voltage is 0V.
A kind ofly apply above-mentioned D.C. voltmeter and carry out the method for 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 the current signal transfer that will detect is to MCU;
S3, MCU judge voltage direction according to the current signal that current detection module A transmits, then control the program-controlled voltage source module output voltage U identical with the voltage direction that records, 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 of program-controlled voltage source module output, and r is the equivalent resistance of program-controlled voltage source module circuit 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 and shows magnitude of voltage U.
This dc voltage measurement method can be measured circuit voltage accurately.
The utility model 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, all conversion of having done, within all dropping on protection domain of the present utility model.
Claims (3)
1. D.C. voltmeter, comprise for the first signal input end that is connected with the measurement point of circuit to be measured and secondary signal input end, it is characterized in that, also comprises:
Master controller MCU, be electrically connected with program-controlled voltage source module and current detection module, is used for the described program-controlled voltage source module of the signal controlling output voltage signal that transmits according to described current detection module;
Described program-controlled voltage source module, be used for the voltage signal according to the signal exporting change of described MCU, and two output terminals of described program-controlled voltage source module are electrically connected to respectively first signal input end and secondary signal input end;
Described current detection module, be used for the current signal transfer that will detect to described MCU, and described current detection module is in series with resistance R, and is in parallel with described program-controlled voltage source module after described current detection module is connected with described resistance R;
Power module, be used for to described D.C. voltmeter power supply, and described power module is electrically connected to described MCU.
2. D.C. voltmeter according to claim 1, is characterized in that, described D.C. voltmeter also comprises that for the display module that shows magnitude of voltage, described display module is electrically connected to 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203624328U CN203287428U (en) | 2013-06-22 | 2013-06-22 | Direct current voltmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203624328U CN203287428U (en) | 2013-06-22 | 2013-06-22 | Direct current voltmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203287428U true CN203287428U (en) | 2013-11-13 |
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ID=49543784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203624328U Withdrawn - After Issue CN203287428U (en) | 2013-06-22 | 2013-06-22 | Direct current voltmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203287428U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103336169A (en) * | 2013-06-22 | 2013-10-02 | 青岛歌尔声学科技有限公司 | Direct current voltmeter and method for measuring voltage by using same |
-
2013
- 2013-06-22 CN CN2013203624328U patent/CN203287428U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103336169A (en) * | 2013-06-22 | 2013-10-02 | 青岛歌尔声学科技有限公司 | Direct current voltmeter and method for measuring voltage by using same |
| CN103336169B (en) * | 2013-06-22 | 2015-07-29 | 青岛歌尔声学科技有限公司 | D.C. voltmeter and apply the method that this voltage table carries out voltage measurement |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131113 Effective date of abandoning: 20150729 |
|
| RGAV | Abandon patent right to avoid regrant |