CN203929872U - A kind of electrical measurement instrument - Google Patents
A kind of electrical measurement instrument Download PDFInfo
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- CN203929872U CN203929872U CN201320891389.4U CN201320891389U CN203929872U CN 203929872 U CN203929872 U CN 203929872U CN 201320891389 U CN201320891389 U CN 201320891389U CN 203929872 U CN203929872 U CN 203929872U
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Abstract
A kind of electrical measurement instrument, signal acquisition circuit is connected with control circuit, and described controller is connected with display circuit, and described controller is also connected with check circuit, carries out the adjusting of no-load voltage ratio by toggle switch.Change no-load voltage ratio by DIP device, undulatory property is little, and degree of accuracy is high; Toggle switch is directly connected with single-chip microcomputer, adopts taking single-chip microcomputer as core, and hardware circuit is simple, and product easily operates, and saves cost simultaneously.
Description
Technical field:
The utility model relates to a kind of electrical measurement instrument.
Background technology:
Along with China's science and technology and industrial expansion, the effect of power instrument is more and more extensive, it is one of important tool ensureing power system security economical operation, being the foundation that the operator on duty of transformer station supervises equipment operation condition, is the source of correctly adding up electric load, accumulative total technical information and calculating the master data of production target.Simultaneously also more and more higher to the requirement of instrument, measurement instrument in the past can complete the measurement of electric current, voltage, in the middle of measuring, the adjusting of no-load voltage ratio is emphasis always, change no-load voltage ratio by the adjusting to potentiometer before this, adopt measurement instrument undulatory property in this way large, expend time in, and precision is poor.
Utility model content:
It is little to reach measurement fluctuation that the utility model technical issues that need to address are to provide a kind of electrical measurement instrument, the object that measuring accuracy is high.
In order to solve the problems of the technologies described above, the technical solution of the utility model is: a kind of electrical measurement instrument, comprise at least one road signal acquisition circuit, and described signal acquisition circuit is connected with controller, described controller is connected with display circuit, and described controller is also connected with check circuit.
Described signal acquisition circuit comprises mutual inductor T1 and amplifier, 1 pin and 2 pin of described mutual inductor T1 connect signal source, 4 pin of described mutual inductor T1 are connected with 3 pin by capacitor C 1, 3 pin of described mutual inductor T1 are connected with 2 pin of amplifier by resistance R 2, 3 pin of described mutual inductor are by capacitor C 2, resistance R 3 is connected with 3 pin of amplifier, described capacitor C 2 is in parallel with resistance R 1, 2 pin of described amplifier are also connected with 1 pin of amplifier by resistance R 4, resistance R 5 is in parallel with resistance R 4 and capacitor C 3 after connecting with capacitor C 4, 1 pin of amplifier is connected with controller by resistance R 6, described resistance R 6 is by capacitor C 5 ground connection, described resistance R 6 meets VCC by diode D1.
Described signal acquisition circuit Wei San road signal acquisition circuit.
Described controller is single-chip microcomputer, and the model of single-chip microcomputer is P89V52X2FA.
Described described testing circuit is toggle switch circuit, and toggle switch circuit is directly connected with single-chip microcomputer.
Compared with prior art, signal acquisition circuit is connected with control circuit the utility model, and described controller is connected with display circuit, described controller is also connected with check circuit, and the adjusting changing by toggle switch, changes no-load voltage ratio by DIP device, undulatory property is little, and degree of accuracy is high; Toggle switch is directly connected with single-chip microcomputer, adopts taking single-chip microcomputer as core, and hardware circuit is simple, and product easily operates, and saves cost simultaneously.
Brief description of the drawings:
Below in conjunction with the drawings and specific embodiments, the utility model is described in further details
Fig. 1 is the utility model schematic diagram
Fig. 2 is the utility model signal acquisition circuit circuit diagram
Fig. 3 is the utility model testing circuit circuit diagram
Fig. 4 is the utility model main program flow chart
In Fig. 1,1, signal acquisition circuit, 2, controller, 3, testing circuit, 4, display circuit.
Embodiment:
As shown in Figure 1, a kind of electrical measurement instrument, comprises at least one road signal acquisition circuit 1, and described signal acquisition circuit 1 is connected with controller 2, and described controller 2 is connected with display circuit 4, and described controller 2 also has check circuit 3 to connect.
The utility model adopts three road signal acquisition circuits 1, controller 2 is single-chip microcomputer, the model of single-chip microcomputer is P89V52X2FA, it is that one has 8KB flash memory, the data-carrier store of 256B, 80C51 single-chip microcomputer with the data EEPROM of 192B, display circuit 4 is by driving chip and charactron to form, wherein charactron adopts common-anode to form by 9 seven segment digital tubes, driving chip is by chip 74HC595, each seven segment numerical die is by a 74HC595 chip drives, and every three seven segment digital tubes are used for showing a road signal output.Described testing circuit 3 is toggle switch circuit, and toggle switch circuit is directly connected with single-chip microcomputer.
As shown in Figure 2, signal acquisition circuit comprises mutual inductor T1 and amplifier, 1 pin and 2 pin of described mutual inductor T1 connect signal source, 4 pin of described mutual inductor T1 are connected with 3 pin by capacitor C 1, 3 pin of described mutual inductor T1 are connected with 2 pin of amplifier by resistance R 2, 3 pin of described mutual inductor are by capacitor C 2, resistance R 3 is connected with 3 pin of amplifier, described capacitor C 2 is in parallel with resistance R 1, 2 pin of described amplifier are also connected with 1 pin of amplifier by resistance R 4, resistance R 5 is in parallel with resistance R 4 and capacitor C 3 after connecting with capacitor C 4, 1 pin of amplifier is connected with controller by resistance R 6, described resistance R 6 is by capacitor C 5 ground connection, described resistance R 6 meets VCC by diode D1.
Come three-phase current or the three-phase voltage signal in collection signal source by mutual inductor T1, the secondary current signal of mutual inductor T1, after sampling resistor converts voltage signal to, then be processed into the accessible signal of single-chip microcomputer through operational amplifier, finally carry out the collection of data by the AD of single-chip microcomputer.
As shown in Figure 3, toggle switch is a address switch that operation controls that is used for, employing be 0/1 binary coding principle, be a microswitch that can stir with hand.The K switch 1 of toggle switch, K2, K3, K4, K5 are directly connected with single-chip microcomputer pin.
Single-chip microcomputer can be by detecting K switch 1, K2, the K3 of toggle switch, the state of K4, K5 obtain a group coding, carries out the processing of signal be arranged to different no-load voltage ratios according to this group coding, finally shows by charactron, thereby realize the adjusting of no-load voltage ratio.This instrument can gather signal by signal acquisition circuit and judge, the adjusting then changing by toggle switch, changes no-load voltage ratio by DIP device, and undulatory property is little, and degree of accuracy is high; Toggle switch is directly connected with single-chip microcomputer, adopts taking single-chip microcomputer as core, and hardware circuit is simple, and product easily operates, and saves cost simultaneously.
Fig. 4 is the utility model program flow diagram, and after step 1 program starts, single-chip microcomputer performs step 2 initialization, comprises timer 0, the initialization of timer 1, and the initialization of IO mouth arranges etc.Perform step again the save data in 3 reading external memories, as calibration factor etc.Then single-chip microcomputer carries out collection and the processing of data by step 4, and the result of processing shows by the charactron in step 5.Finally perform step 6 EOP (end of program).
Claims (5)
1. an electrical measurement instrument, it is characterized in that: comprise at least one road signal acquisition circuit (1), described signal acquisition circuit (1) is connected with controller (2), described controller (2) is connected with display circuit (4), and described controller (2) also has check circuit (3) to connect.
2. a kind of electrical measurement instrument according to claim 1, it is characterized in that: described signal acquisition circuit (1) comprises mutual inductor T1 and amplifier, 1 pin and 2 pin of described mutual inductor T1 connect signal source, 4 pin of described mutual inductor T1 are connected with 3 pin by capacitor C 1, 3 pin of described mutual inductor T1 are connected with 2 pin of amplifier by resistance R 2, 3 pin of described mutual inductor are by capacitor C 2, resistance R 3 is connected with 3 pin of amplifier, institute's capacitor C 2 is in parallel with resistance R 1, 2 pin of described amplifier are also connected with 1 pin of amplifier by resistance R 4, resistance R 5 is in parallel with resistance R 4 and capacitor C 3 after connecting with capacitor C 4, 1 pin of amplifier is connected with controller by resistance R 6, described resistance R 6 is by capacitor C 5 ground connection, described resistance R 6 meets VCC by diode D1.
3. a kind of electrical measurement instrument according to claim 1 and 2, is characterized in that: described signal acquisition circuit Wei San road signal acquisition circuit.
4. a kind of electrical measurement instrument according to claim 1 and 2, is characterized in that: described controller is single-chip microcomputer, the model of single-chip microcomputer is P89V52X2FA.
5. a kind of electrical measurement instrument according to claim 1 and 2, is characterized in that: described testing circuit is toggle switch circuit, dial-up quick closing valve circuit is directly connected with single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320891389.4U CN203929872U (en) | 2013-12-31 | 2013-12-31 | A kind of electrical measurement instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320891389.4U CN203929872U (en) | 2013-12-31 | 2013-12-31 | A kind of electrical measurement instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203929872U true CN203929872U (en) | 2014-11-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320891389.4U Expired - Fee Related CN203929872U (en) | 2013-12-31 | 2013-12-31 | A kind of electrical measurement instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203929872U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730329A (en) * | 2015-04-08 | 2015-06-24 | 武汉大学 | Electric quantity detector |
-
2013
- 2013-12-31 CN CN201320891389.4U patent/CN203929872U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730329A (en) * | 2015-04-08 | 2015-06-24 | 武汉大学 | Electric quantity detector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 Termination date: 20161231 |