CN204422649U - A kind of digital frequency meter - Google Patents
A kind of digital frequency meter Download PDFInfo
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- CN204422649U CN204422649U CN201520147864.6U CN201520147864U CN204422649U CN 204422649 U CN204422649 U CN 204422649U CN 201520147864 U CN201520147864 U CN 201520147864U CN 204422649 U CN204422649 U CN 204422649U
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Abstract
The utility model discloses a kind of digital frequency meter, comprise governor circuit, amplification and rectification circuit, display circuit; Governor circuit is connected with amplification and rectification circuit, display circuit respectively; Measured signal is introduced into amplification and rectification circuit and carries out signal amplification and wave shaping, and the signal amplified after shaping will be sent to governor circuit; Governor circuit counts measured signal, and the frequency data measured are delivered to display circuit; The frequency data measured show by display circuit over the display.The utility model utilizes single-chip microcomputer to realize the measurement of frequency power signal value.Measured signal is introduced into signal amplification circuit and amplifies, be sent to waveform shaping circuit shaping again, signal after shaping is admitted to metering circuit, and the counter of single-chip microcomputer and the function of timer count measured signal, and the frequency data measured are delivered to display circuit display.The measuring accuracy of this digital frequency meter is higher, and range is comparatively large, and cost is low.
Description
Technical field
The utility model belongs to smart electronics instrument field, is specifically related to a kind of simple digital formula frequency meter.
Background technology
On market, digital frequency meter is of a great variety, but the contradiction between the measurement range of most of digital frequency meter and price is solved well, the price that measurement range is wide is also higher, therefore needs to seek wider, the lower-cost digital frequency meter of a kind of measurement range.
Utility model content
In order to solve above-mentioned technical matters, the utility model discloses wider, the lower-cost digital frequency meter of a kind of measurement range.
The technical scheme that the utility model adopts is: a kind of digital frequency meter, is characterized in that: comprise governor circuit, amplification and rectification circuit, display circuit; Described governor circuit is connected with described amplification and rectification circuit, display circuit respectively; Measured signal is introduced into described amplification and rectification circuit and carries out signal amplification and wave shaping, and the signal amplified after shaping will be sent to described governor circuit; Described governor circuit counts measured signal, and the frequency data measured are delivered to described display circuit; The frequency data measured show by described display circuit over the display.
As preferably, described digital frequency meter also comprises key circuit, is connected with described governor circuit, cut-offs for the circuit controlling described digital frequency meter.
As preferably, described digital frequency meter also comprises LED circuit, is connected with described governor circuit, for unit display pilot lamp.
As preferably, described governor circuit coordinates the core circuit that each circuit normally works, and its core devices is single-chip microcomputer STM8S003; The pin 2,3,7 of single-chip microcomputer STM8S003 stamps network label PA1, PA2 and PA3 respectively; Pin 4 ground connection; Pin 5 is by electric capacity C8 ground connection; Pin 18,19,20,21,22,23,24,25,26,27,28,29 stamps network label D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D10 and D11 respectively; Pin 30,31,32 is stamped respectively network label TXD, RXD and RC1.
As preferably, described amplification and rectification circuit carries out frequency division to measured signal, and its core devices is 12 binary system serial counter chip CD4040; The pin 9,7,6,5,3,2,4,13,12,14,15,1 of chip CD4040 stamps network label D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D1 and D11 respectively; Input signal is connected on the pin 1 of chip 74LS14; The pin 1 of chip 74LS14 is stamped network label VIN; The plus earth of diode 1N5918B, negative pole is connected on the pin 1 of 74LS14; The pin 2,3 of chip 74LS14 is connected; The pin 4 of chip 74LS14 is connected on the pin 10 of chip CD4040; Pin 11 ground connection of CD4040 chip.
As preferably, the core devices of described display circuit is chip 74LS595 and charactron Dpy Blue-CA; First make U4, U5, U6, U7, U8, U9 represent the identical 74LS595 chip of six types respectively, DS1, DS2, DS3, DS4, DS5, DS6 represent the identical charactron of six types respectively; Then the pin 1,2,3,4,5,6,7,15 of U4 is connected on the pin 6,4,2,1,9,10,5,7 of DS1 respectively; The pin 11,12,14 of U4 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U4 meets VCC; Pin 13 ground connection of U4; VCC is met by resistance R5 after the pin 3 of DS1 is connected with 8; The pin 1,2,3,4,5,6,7,15 of U5 is connected on the pin 6,4,2,1,9,10,5,7 of DS2 respectively; The pin 11,12,14 of U5 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U5 meets VCC; Pin 13 ground connection of U5; VCC is met by resistance R6 after the pin 3 of DS2 is connected with 8; The pin 1,2,3,4,5,6,7,15 of U6 is connected on the pin 6,4,2,1,9,10,5,7 of DS3 respectively; The pin 11,12,14 of U6 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U6 meets VCC; Pin 13 ground connection of U6; VCC is met by resistance R7 after the pin 3 of DS3 is connected with 8; The pin 1,2,3,4,5,6,7,15 of U7 is connected on the pin 6,4,2,1,9,10,5,7 of DS4 respectively; The pin 11,12,14 of U7 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U7 meets VCC; Pin 13 ground connection of U7; VCC is met by resistance R5 after the pin 3 of DS4 is connected with 8; The pin 1,2,3,4,5,6,7,15 of U8 is connected on the pin 6,4,2,1,9,10,5,7 of DS5 respectively; The pin 11,12,14 of U8 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U8 meets VCC; Pin 13 ground connection of U8; VCC is met by resistance R5 after the pin 3 of DS5 is connected with 8; The pin 1,2,3,4,5,6,7,15 of U9 is connected on the pin 6,4,2,1,9,10,5,7 of DS6 respectively; The pin 11,12,14 of U9 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U9 meets VCC; Pin 13 ground connection of U9; VCC is met by resistance R5 after the pin 3 of DS6 is connected with 8; The pin 9 of U4 is connected with the pin 14 of U5; The pin 9 of U5 is connected with the pin 14 of U6; The pin 9 of U6 is connected with the pin 14 of U7; The pin 9 of U7 is connected with the pin 14 of U8; The pin 9 of U8 is connected with the pin 14 of U9; Pin 9 ground connection of U9.
As preferably, described key circuit, one end ground connection of its button SW-PB, one end meets VCC by resistance R11; Network label PA3 is stamped in one end of button SW-PB.
As preferably, the core devices of described LED circuit is triode 9012, and make Q1, Q2 represent two triodes 9012 of the same type respectively, then the base stage of Q1 is connected on resistance R1; Network label PA1 is stamped in the side of resistance R1; The collector C of Q1 is by light emitting diode HL1 ground connection; The emitter E of Q1 meets VCC by resistance R3; The base stage of Q2 is connected on resistance R2; Network label PA2 is stamped in the side of resistance R2; The collector C of Q2 is by light emitting diode HL2 ground connection; The emitter E of Q2 meets VCC by resistance R4.
Digital frequency meter of the present utility model utilizes single-chip microcomputer to realize the measurement of frequency power signal value.Measured signal is introduced into signal amplification circuit and amplifies, be sent to waveform shaping circuit shaping again, signal after shaping is admitted to metering circuit, and the counter of single-chip microcomputer and the function of timer count measured signal, and the frequency data measured are delivered to display circuit display.The measuring accuracy of this digital frequency meter is higher, and range is comparatively large, and cost is low.
Accompanying drawing explanation
Fig. 1: the circuit theory diagrams of the utility model embodiment;
Fig. 2: the governor circuit of the utility model embodiment and the circuit diagram of amplification and rectification circuit;
Fig. 3: the circuit diagram of the display circuit of the utility model embodiment;
Fig. 4: the circuit diagram of the key circuit of the utility model embodiment;
Fig. 5: the circuit diagram of the LED circuit of the utility model embodiment;
Embodiment
Understand for the ease of those of ordinary skill in the art and implement the utility model, below in conjunction with drawings and Examples, the utility model is described in further detail, should be appreciated that exemplifying embodiment described herein is only for instruction and explanation of the utility model, and be not used in restriction the utility model.
Ask for an interview Fig. 1, a kind of digital frequency meter that the utility model provides, comprise governor circuit, amplification and rectification circuit, display circuit, key circuit and LED circuit; Governor circuit is connected with amplification and rectification circuit, display circuit, key circuit and LED circuit respectively; The circuit that key circuit is used for control figure formula frequency meter cut-offs; LED circuit is used for unit display pilot lamp; Measured signal is introduced into amplification and rectification circuit and carries out signal amplification and wave shaping, and the signal amplified after shaping will be sent to governor circuit; Governor circuit counts measured signal, and the frequency data measured are delivered to display circuit; The frequency data measured show by display circuit over the display.
Ask for an interview Fig. 2, the governor circuit of this enforcement is the core circuit that each circuit of coordination normally works, and its core devices is single-chip microcomputer STM8S003; The pin 2,3,7 of single-chip microcomputer STM8S003 stamps network label PA1, PA2 and PA3 respectively; Pin 4 ground connection; Pin 5 is by electric capacity C8 ground connection; Pin 18,19,20,21,22,23,24,25,26,27,28,29 stamps network label D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D10 and D11 respectively; Pin 30,31,32 is stamped respectively network label TXD, RXD and RC1.Governor circuit is that digital frequency meter can the pith of smooth steady operation, is to coordinate the core that each circuit normally works.
Ask for an interview Fig. 2, the amplification and rectification circuit of this enforcement carries out frequency division to measured signal, and its core devices is 12 binary system serial counter chip CD4040; The pin 9,7,6,5,3,2,4,13,12,14,15,1 of chip CD4040 stamps network label D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D1 and D11 respectively; Input signal is connected on the pin 1 of chip 74LS14; The pin 1 of chip 74LS14 is stamped network label VIN; The plus earth of diode 1N5918B, negative pole is connected on the pin 1 of 74LS14; The pin 2,3 of chip 74LS14 is connected; The pin 4 of chip 74LS14 is connected on the pin 10 of chip CD4040; Pin 11 ground connection of CD4040 chip.Amplification and rectification circuit can improve the scope of survey frequency, can also improve the precision of frequency measurement accordingly.
Ask for an interview Fig. 3, the core devices of the display circuit of this enforcement is chip 74LS595 and charactron Dpy Blue-CA; First make U4, U5, U6, U7, U8, U9 represent the identical 74LS595 chip of six types respectively, DS1, DS2, DS3, DS4, DS5, DS6 represent the identical charactron of six types respectively; Then the pin 1,2,3,4,5,6,7,15 of U4 is connected on the pin 6,4,2,1,9,10,5,7 of DS1 respectively; The pin 11,12,14 of U4 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U4 meets VCC; Pin 13 ground connection of U4; VCC is met by resistance R5 after the pin 3 of DS1 is connected with 8; The pin 1,2,3,4,5,6,7,15 of U5 is connected on the pin 6,4,2,1,9,10,5,7 of DS2 respectively; The pin 11,12,14 of U5 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U5 meets VCC; Pin 13 ground connection of U5; VCC is met by resistance R6 after the pin 3 of DS2 is connected with 8; The pin 1,2,3,4,5,6,7,15 of U6 is connected on the pin 6,4,2,1,9,10,5,7 of DS3 respectively; The pin 11,12,14 of U6 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U6 meets VCC; Pin 13 ground connection of U6; VCC is met by resistance R7 after the pin 3 of DS3 is connected with 8; The pin 1,2,3,4,5,6,7,15 of U7 is connected on the pin 6,4,2,1,9,10,5,7 of DS4 respectively; The pin 11,12,14 of U7 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U7 meets VCC; Pin 13 ground connection of U7; VCC is met by resistance R5 after the pin 3 of DS4 is connected with 8; The pin 1,2,3,4,5,6,7,15 of U8 is connected on the pin 6,4,2,1,9,10,5,7 of DS5 respectively; The pin 11,12,14 of U8 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U8 meets VCC; Pin 13 ground connection of U8; VCC is met by resistance R5 after the pin 3 of DS5 is connected with 8; The pin 1,2,3,4,5,6,7,15 of U9 is connected on the pin 6,4,2,1,9,10,5,7 of DS6 respectively; The pin 11,12,14 of U9 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U9 meets VCC; Pin 13 ground connection of U9; VCC is met by resistance R5 after the pin 3 of DS6 is connected with 8; The pin 9 of U4 is connected with the pin 14 of U5; The pin 9 of U5 is connected with the pin 14 of U6; The pin 9 of U6 is connected with the pin 14 of U7; The pin 9 of U7 is connected with the pin 14 of U8; The pin 9 of U8 is connected with the pin 14 of U9; Pin 9 ground connection of U9.Display device is output block important in digital display circuit, for intuitive measurement results fed back to gauger, is the necessary links of man-machine interaction.
Ask for an interview Fig. 4, the circuit that the key circuit of this enforcement is used for control figure formula frequency meter cut-offs; One end ground connection of its button SW-PB, one end meets VCC by resistance R11; Network label PA3 is stamped in one end of button SW-PB.
Ask for an interview Fig. 5, the core devices of the LED circuit of this enforcement is triode 9012, and make Q1, Q2 represent two triodes 9012 of the same type respectively, then the base stage of Q1 is connected on resistance R1; Network label PA1 is stamped in the side of resistance R1; The collector C of Q1 is by light emitting diode HL1 ground connection; The emitter E of Q1 meets VCC by resistance R3; The base stage of Q2 is connected on resistance R2; Network label PA2 is stamped in the side of resistance R2; The collector C of Q2 is by light emitting diode HL2 ground connection; The emitter E of Q2 meets VCC by resistance R4.
This digital frequency meter operationally connects measured signal, to various piece module for power supply, is run, can read concrete frequency values after operation on numeral method device by key circuit control figure formula frequency meter.
Should be understood that, the part that this instructions does not elaborate all belongs to prior art.
Should be understood that; the above-mentioned description for preferred embodiment is comparatively detailed; therefore the restriction to the utility model scope of patent protection can not be thought; those of ordinary skill in the art is under enlightenment of the present utility model; do not departing under the ambit that the utility model claim protects; can also make and replacing or distortion, all fall within protection domain of the present utility model, request protection domain of the present utility model should be as the criterion with claims.
Claims (8)
1. a digital frequency meter, is characterized in that: comprise governor circuit, amplification and rectification circuit, display circuit; Described governor circuit is connected with described amplification and rectification circuit, display circuit respectively; Measured signal is introduced into described amplification and rectification circuit and carries out signal amplification and wave shaping, and the signal amplified after shaping will be sent to described governor circuit; Described governor circuit counts measured signal, and the frequency data measured are delivered to described display circuit; The frequency data measured show by described display circuit over the display.
2. digital frequency meter according to claim 1, is characterized in that: described digital frequency meter also comprises key circuit, is connected with described governor circuit, cut-offs for the circuit controlling described digital frequency meter.
3. digital frequency meter according to claim 1, is characterized in that: described digital frequency meter also comprises LED circuit, is connected with described governor circuit, for unit display pilot lamp.
4. digital frequency meter according to claim 1, is characterized in that: described governor circuit is the core circuit that each circuit of coordination normally works, and its core devices is single-chip microcomputer STM8S003; The pin 2,3,7 of single-chip microcomputer STM8S003 stamps network label PA1, PA2 and PA3 respectively; Pin 4 ground connection; Pin 5 is by electric capacity C8 ground connection; Pin 18,19,20,21,22,23,24,25,26,27,28,29 stamps network label D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D10 and D11 respectively; Pin 30,31,32 is stamped respectively network label TXD, RXD and RC1.
5. digital frequency meter according to claim 1, is characterized in that: described amplification and rectification circuit carries out frequency division to measured signal, and its core devices is 12 binary system serial counter chip CD4040; The pin 9,7,6,5,3,2,4,13,12,14,15,1 of chip CD4040 stamps network label D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D1 and D11 respectively; Input signal is connected on the pin 1 of chip 74LS14; The pin 1 of chip 74LS14 is stamped network label VIN; The plus earth of diode 1N5918B, negative pole is connected on the pin 1 of 74LS14; The pin 2,3 of chip 74LS14 is connected; The pin 4 of chip 74LS14 is connected on the pin 10 of chip CD4040; Pin 11 ground connection of CD4040 chip.
6. digital frequency meter according to claim 1, is characterized in that: the core devices of described display circuit is chip 74LS595 and charactron Dpy Blue-CA; First make U4, U5, U6, U7, U8, U9 represent the identical 74LS595 chip of six types respectively, DS1, DS2, DS3, DS4, DS5, DS6 represent the identical charactron of six types respectively; Then the pin 1,2,3,4,5,6,7,15 of U4 is connected on the pin 6,4,2,1,9,10,5,7 of DS1 respectively; The pin 11,12,14 of U4 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U4 meets VCC; Pin 13 ground connection of U4; VCC is met by resistance R5 after the pin 3 of DS1 is connected with 8; The pin 1,2,3,4,5,6,7,15 of U5 is connected on the pin 6,4,2,1,9,10,5,7 of DS2 respectively; The pin 11,12,14 of U5 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U5 meets VCC; Pin 13 ground connection of U5; VCC is met by resistance R6 after the pin 3 of DS2 is connected with 8; The pin 1,2,3,4,5,6,7,15 of U6 is connected on the pin 6,4,2,1,9,10,5,7 of DS3 respectively; The pin 11,12,14 of U6 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U6 meets VCC; Pin 13 ground connection of U6; VCC is met by resistance R7 after the pin 3 of DS3 is connected with 8; The pin 1,2,3,4,5,6,7,15 of U7 is connected on the pin 6,4,2,1,9,10,5,7 of DS4 respectively; The pin 11,12,14 of U7 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U7 meets VCC; Pin 13 ground connection of U7; VCC is met by resistance R5 after the pin 3 of DS4 is connected with 8; The pin 1,2,3,4,5,6,7,15 of U8 is connected on the pin 6,4,2,1,9,10,5,7 of DS5 respectively; The pin 11,12,14 of U8 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U8 meets VCC; Pin 13 ground connection of U8; VCC is met by resistance R5 after the pin 3 of DS5 is connected with 8; The pin 1,2,3,4,5,6,7,15 of U9 is connected on the pin 6,4,2,1,9,10,5,7 of DS6 respectively; The pin 11,12,14 of U9 stamps network label TXD, RXD and RC1 respectively; The pin 10 of U9 meets VCC; Pin 13 ground connection of U9; VCC is met by resistance R5 after the pin 3 of DS6 is connected with 8; The pin 9 of U4 is connected with the pin 14 of U5; The pin 9 of U5 is connected with the pin 14 of U6; The pin 9 of U6 is connected with the pin 14 of U7; The pin 9 of U7 is connected with the pin 14 of U8; The pin 9 of U8 is connected with the pin 14 of U9; Pin 9 ground connection of U9.
7. digital frequency meter according to claim 2, is characterized in that: described key circuit, one end ground connection of its button SW-PB, and one end meets VCC by resistance R11; Network label PA3 is stamped in one end of button SW-PB.
8. digital frequency meter according to claim 3, is characterized in that: the core devices of described LED circuit is triode 9012, and make Q1, Q2 represent two triodes 9012 of the same type respectively, then the base stage of Q1 is connected on resistance R1; Network label PA1 is stamped in the side of resistance R1; The collector C of Q1 is by light emitting diode HL1 ground connection; The emitter E of Q1 meets VCC by resistance R3; The base stage of Q2 is connected on resistance R2; Network label PA2 is stamped in the side of resistance R2; The collector C of Q2 is by light emitting diode HL2 ground connection; The emitter E of Q2 meets VCC by resistance R4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520147864.6U CN204422649U (en) | 2015-03-16 | 2015-03-16 | A kind of digital frequency meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520147864.6U CN204422649U (en) | 2015-03-16 | 2015-03-16 | A kind of digital frequency meter |
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| CN204422649U true CN204422649U (en) | 2015-06-24 |
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| CN201520147864.6U Expired - Fee Related CN204422649U (en) | 2015-03-16 | 2015-03-16 | A kind of digital frequency meter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785122A (en) * | 2016-05-24 | 2016-07-20 | 南宁市茂百科技有限公司 | Digital cymometer |
| CN107271771A (en) * | 2017-06-28 | 2017-10-20 | 北京电子科技学院 | Low-voltage network carrier signal detecting system |
-
2015
- 2015-03-16 CN CN201520147864.6U patent/CN204422649U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785122A (en) * | 2016-05-24 | 2016-07-20 | 南宁市茂百科技有限公司 | Digital cymometer |
| CN107271771A (en) * | 2017-06-28 | 2017-10-20 | 北京电子科技学院 | Low-voltage network carrier signal detecting system |
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