CN205691665U - A kind of frequency measurement indicating circuit - Google Patents
A kind of frequency measurement indicating circuit Download PDFInfo
- Publication number
- CN205691665U CN205691665U CN201620530571.0U CN201620530571U CN205691665U CN 205691665 U CN205691665 U CN 205691665U CN 201620530571 U CN201620530571 U CN 201620530571U CN 205691665 U CN205691665 U CN 205691665U
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- resistance
- audion
- diode
- electric capacity
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Abstract
The utility model discloses a kind of frequency measurement indicating circuit, including diode D1, resistance R1, audion VT1, electric capacity C1, ammeter A, audion VT2 and electric capacity C2, described diode D1 positive pole connects exchange AC one end and resistance R2 respectively, the resistance R2 other end connects diode D3 negative pole and audion VT1 base stage respectively, and audion VT1 colelctor electrode connects resistance R3 and electric capacity C1 respectively.This utility model frequency measurement indicating circuit uses audion discrete component to control, without by programming device, measurement process is all to carry out according to the self character of electronic component, disturb without computed in software, do not have when sampled point occurrence frequency changes, the problem that the sample frequency calculated will occur bigger deviation, the frequency values of tested alternating voltage can be read by ammeter, circuit structure is simple, and low cost, volume is little.
Description
Technical field
This utility model relates to a kind of measuring circuit, specifically a kind of frequency measurement indicating circuit.
Background technology
In measuring instruments and relay protection circuit, the application of frequency measurement circuit widely, at present, in electric power low-pressure
In metering device, traditional frequency measuring process is: the data input processor sampled by AD, the number that processor is sampled according to AD
According to and utilize its internal software program to calculate the cycle of sampled signal of trying to achieve.This long-term practice process finds, this biography
There is following defect in the frequency measurement of system: when sampled point occurrence frequency changes, the sample frequency calculated will occur
Bigger deviation, and need to carry out software programming, the construction cycle is long, and cost is high.
Utility model content
The purpose of this utility model is to provide a kind of frequency measurement indicating circuit, to solve to propose in above-mentioned background technology
Problem.
For achieving the above object, the following technical scheme of this utility model offer:
A kind of frequency measurement indicating circuit, including diode D1, resistance R1, audion VT1, electric capacity C1, ammeter A, three
Pole pipe VT2 and electric capacity C2, described diode D1 positive pole connects exchange AC one end and resistance R2 respectively, and the resistance R2 other end connects respectively
Connecing diode D3 negative pole and audion VT1 base stage, audion VT1 colelctor electrode connects resistance R3 and electric capacity C1 respectively, and electric capacity C1 is another
One end connects diode D4 negative pole and audion VT2 base stage respectively, and diode D4 positive pole connects resistance R4, audion VT2 and launches
Pole connects electric capacity C2 and resistance R6 respectively, and audion VT2 colelctor electrode connects resistance R5, and the resistance R5 other end connects ammeter A, electricity
The stream Table A other end connects the resistance R3 other end, diode D2 negative pole and resistance R1 respectively, and the resistance R1 other end connects diode D1
Negative pole, the described resistance R6 other end connects the electric capacity C2 other end, the resistance R4 other end, audion VT1 emitter stage, diode respectively
D3 positive pole, diode D2 positive pole with exchange the AC other end.
As this utility model further scheme: described diode D3 is Zener diode.
Compared with prior art, the beneficial effects of the utility model are: this utility model frequency measurement indicating circuit uses
Audion discrete component controls, it is not necessary to by programming device, measurement process is all to carry out according to the self character of electronic component
, to disturb without computed in software, do not have when sampled point occurrence frequency changes, the sample frequency calculated will occur relatively
The problem of big deviation, can read the frequency values of tested alternating voltage by ammeter, and circuit structure is simple, low cost, body
Long-pending little.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of frequency measurement indicating circuit.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under making creative work premise
The every other embodiment obtained, broadly falls into the scope of this utility model protection.
Referring to Fig. 1, in this utility model embodiment, a kind of frequency measurement indicating circuit, including diode D1, resistance
R1, audion VT1, electric capacity C1, ammeter A, audion VT2 and electric capacity C2, described diode D1 positive pole connects exchange AC respectively
One end and resistance R2, the resistance R2 other end connects diode D3 negative pole and audion VT1 base stage, audion VT1 colelctor electrode respectively
Connecting resistance R3 and electric capacity C1 respectively, the electric capacity C1 other end connects diode D4 negative pole and audion VT2 base stage, diode respectively
D4 positive pole connects resistance R4, and audion VT2 emitter stage connects electric capacity C2 and resistance R6 respectively, and audion VT2 colelctor electrode connects electricity
Resistance R5, the resistance R5 other end connect ammeter A, the ammeter A other end connect respectively the resistance R3 other end, diode D2 negative pole and
Resistance R1, the resistance R1 other end connects diode D1 negative pole, and the described resistance R6 other end connects the electric capacity C2 other end, resistance respectively
The R4 other end, audion VT1 emitter stage, diode D3 positive pole, diode D2 positive pole with exchange the AC other end；Described diode D3
For Zener diode.
Operation principle of the present utility model is: refer to Fig. 1, and exchange AC mono-tunnel is turned by diode D1, D2 and resistance R1, R2
Being changed to unidirectional current, provide power supply for circuit below, another road is after diode D3 amplitude limit and audion VT1, exchange AC
Deliver to ammeter A after becoming a square wave, then the peaker by the composition such as resistance R3, electric capacity C1 indicate, because after differential
The average current of spike be directly proportional to frequency, then pass through the reading of ammeter, the frequency of exchange AC can be learnt.
It is obvious to a person skilled in the art that this utility model is not limited to the details of above-mentioned one exemplary embodiment, and
And in the case of without departing substantially from spirit or essential attributes of the present utility model, it is possible to realize this practicality in other specific forms new
Type.Therefore, no matter from the point of view of which point, all should regard embodiment as exemplary, and be nonrestrictive, this practicality is new
The scope of type is limited by claims rather than described above, it is intended that by the containing of equivalency in claim that fall
All changes in justice and scope are included in this utility model.Should not be considered as any reference in claim limiting
Involved claim.
Although moreover, it will be appreciated that this specification is been described by according to embodiment, but the most each embodiment only wraps
Containing an independent technical scheme, this narrating mode of description is only that for clarity sake those skilled in the art should
Description can also be formed those skilled in the art through appropriately combined as an entirety, the technical scheme in each embodiment
May be appreciated other embodiments.
Claims (2)
1. a frequency measurement indicating circuit, including diode D1, resistance R1, audion VT1, electric capacity C1, ammeter A, three poles
Pipe VT2 and electric capacity C2, it is characterised in that described diode D1 positive pole connects exchange AC one end and resistance R2 respectively, and resistance R2 is another
One end connects diode D3 negative pole and audion VT1 base stage respectively, and audion VT1 colelctor electrode connects resistance R3 and electric capacity respectively
C1, the electric capacity C1 other end connects diode D4 negative pole and audion VT2 base stage respectively, and diode D4 positive pole connects resistance R4, and three
Pole pipe VT2 emitter stage connects electric capacity C2 and resistance R6 respectively, and audion VT2 colelctor electrode connects resistance R5, and the resistance R5 other end is even
Meeting ammeter A, the ammeter A other end connects the resistance R3 other end, diode D2 negative pole and resistance R1, the resistance R1 other end respectively
Connecting diode D1 negative pole, the described resistance R6 other end connects the electric capacity C2 other end, the resistance R4 other end, audion VT1 respectively
Emitter stage, diode D3 positive pole, diode D2 positive pole with exchange the AC other end.
Frequency measurement indicating circuit the most according to claim 1, it is characterised in that described diode D3 is voltage stabilizing two pole
Pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620530571.0U CN205691665U (en) | 2016-06-04 | 2016-06-04 | A kind of frequency measurement indicating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620530571.0U CN205691665U (en) | 2016-06-04 | 2016-06-04 | A kind of frequency measurement indicating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205691665U true CN205691665U (en) | 2016-11-16 |
Family
ID=57260552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620530571.0U Expired - Fee Related CN205691665U (en) | 2016-06-04 | 2016-06-04 | A kind of frequency measurement indicating circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205691665U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346417A (en) * | 2019-07-28 | 2019-10-18 | 北京交通大学 | A kind of tunnel inverted arch quality nondestructive testing instrument |
-
2016
- 2016-06-04 CN CN201620530571.0U patent/CN205691665U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346417A (en) * | 2019-07-28 | 2019-10-18 | 北京交通大学 | A kind of tunnel inverted arch quality nondestructive testing instrument |
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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: 20161116 Termination date: 20170604 |