CN2145388Y - Anti-steal electric remote detector - Google Patents
Anti-steal electric remote detector Download PDFInfo
- Publication number
- CN2145388Y CN2145388Y CN 92225450 CN92225450U CN2145388Y CN 2145388 Y CN2145388 Y CN 2145388Y CN 92225450 CN92225450 CN 92225450 CN 92225450 U CN92225450 U CN 92225450U CN 2145388 Y CN2145388 Y CN 2145388Y
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- CN
- China
- Prior art keywords
- amplifying circuit
- circuit
- utility
- model
- probe
- 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.)
- Expired - Fee Related
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- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model is composed of a telemetering probe amplifying circuit, an IC pre-amplifying circuit, an IC power amplifying circuit, a detection display circuit and a power supply circuit. The utility model is characterized in that the probe amplifying circuit adopts a bigrid MOS field effect tube as a probe to improve the sensitivity of the utility model. The IC pre-amplifying circuit and the IC power amplifying circuit are added on the back of the telemetering probe amplifying circuit, and the telemetering probe amplifying circuit is also provided with a meter head to cause the strength and the frequency of the measured electric field to be clearly reflected by the utility model. The utility model can be widely used for the field of the anti-steal electric reconnaissance, the line fault lookup, the high voltage wire broadcasting remote measurement, etc.
Description
The utility model belongs to a kind of meters of measuring the electromagnetism variable, particularly a kind of miniature electric field measuring apparatus.
Existing miniature electric field detection instrument such as application number are the multifunction micro electric field detector patent of CN-90224232.6.There are several shortcomings in this detector: 1. owing to only be to use multistage triode to carry out compound amplification in probe circuit, noise is big, and sensitivity is not high.When detecting low-voltage, probe must contact with lead.2. whether the existence that just identifies electric field with LED luminous can not reflect the field intensity and the frequency of tested electric field.
The purpose of this utility model will provide a kind of sensitivity height exactly, can know that reflection detects the field intensity of electric field and the miniature electric field measuring apparatus of frequency.
The utility model is achieved in that in probe amplifier, changing common detection instrument uses multistage triode to amplify, but utilize field effect transistor input impedance height, the characteristics that noise figure is little, using the bigrid metal-oxide-semiconductor field effect transistor to do the first order amplifies, to adapt to the needs that reflect detected electric field frequency, improve the sensitivity of measuring instrument; Behind probe amplifier, be added with IC(TDA2822) pre-amplification circuit and IC(TDA2822) power amplification circuit, when the bigrid metal-oxide-semiconductor field effect transistor the induction signal through G
1After amplification is connected to second level triode amplification, being capacitively coupled to a pair of power amplifier TDA2822 by one puts in advance, again signal is coupled to the power amplifier input end of this pair power amplifier, export through an electric capacity then, make it promote loudspeaker, so that the user hears the frequency signal of surveying electric field signal rapidly, the identification unlike signal; In detecting display circuit, except being added with the luminous warning circuit of LED, the gauge outfit indication is housed also, show the field intensity that detects electric field signal intuitively.
Owing to taked above measure, made the utility model obtain following four advantages:
1. adopt new electronic component, do probe with the bigrid metal-oxide-semiconductor field effect transistor probe sensitivity can freely be adjusted.Because field effect transistor input impedance is high, noise figure is little, so the sensitivity of this telegauge is higher, can receives 50 hertz of more weak alternating electric field signals effectively, and reach the remote measurement of opposing electricity-stealing more at a distance.
2. receiving transducer adopts the variable telescopic antenna form of length, can further increase the induction of field signal, and the expansion telemeter distance is convenient to the user and is carried.
3. this telegauge show to adopt light emitting diode to report to the police and directly amplifies the received signal electric field form that combines, and can make the user hear the frequency signal of the electric field signal of surveying rapidly, is beneficial to the User Recognition unlike signal.Because this circuit light emitting diode is reported to the police and acoustics circuit is controlled respectively, when the user does not need sound, volume can be adjusted to minimum, and not influence the remote measurement effect, luminous indication is reported to the police and is still kept alarm condition.
4. the gauge outfit indication is equipped with in the field intensity indication, and intuitive display is beneficial to the user and adjusts identification, has improved the accuracy and the reliability of measurement telemetry.
Figure one is a functional structure block scheme of the present utility model.
Figure two is circuit working schematic diagrams of the present utility model.
Further specify structure of the present utility model below in conjunction with drawings and Examples.
When antenna receives electric field signal, by C
1And R
1Form the electrical shock protection circuit, signal is incorporated into BG
1The time, field effect transistor G
1(grid) amplifies, and amplifying signal is connected to BG
2, base stage is carried out audible communication and is amplified (R
2Be BG
1Pull-up resistor, R
3Be BG
2Pull-up resistor).Signal is by C
3Be coupled to integrated circuit TDA2822 the 6th pin input end and carry out the preposition amplification of audio frequency, amplifying signal is by C
7Be coupled to the volume regulating resistor, through C
2To IC(TDA2822) the 7th pin (being the power amplifier input pin), the sound signal that is exaggerated is through C
5Promote the loudspeaker sounding.The warning light emission instruction signal is by BG
2, BG
3Form compound amplification.When receiving measured signal, D
2Light emitting diode is promptly bright.
In the circuit by BG
1D, the S utmost point between become Low ESR, BG
2, BG
3Then end, luminotron does not work, and loudspeaker is noiseless.
Detect gauge outfit and be mainly used in the strong and weak detection of signal.
W
1Play the sensitivity regulating action, change G
2(grid) can adjust the sensitivity of receiving transducer, works as G
2When current potential rises, BG
1When gain will be risen; G
2When current potential descends, BG
1Gain also descend.Thereby can suitably control BG according to different test case
1Change in gain, reach best remote measurement effect.
The utility model in use, at first the power supply lock in detected zone is cut off, carry the utility model and enter detected district, if this time domain electric wire has drawn a power lead (without ammeter) in addition, just have alternating electric field, receive through antenna and amplify, the utility model is just luminous, sounding alarm, thus reach the purpose of opposing electricity-stealing.
The utility model can be in the utilization of multiple occasion, and except that the remote measurement that is used to oppose electricity-stealing, can also be used for line fault and search, high-voltage electric field warning remote measurement, transmission line of electricity send electric situation remote measurement, the high voltage wired broadcast remote measurement, the indoor electric appliance device security detects, detection of electrical leakage etc.
Claims (5)
1, a kind of telegauge of being made up of remote measurement probe amplifier, IC pre-amplification circuit, IC power amplification circuit, detection display circuit and power circuit of opposing electricity-stealing is characterized in that doing probe with the bigrid metal-oxide-semiconductor field effect transistor in the remote measurement probe circuit.
2, the telegauge of opposing electricity-stealing according to claim 1 is characterized in that the G of bigrid metal-oxide-semiconductor field effect transistor
2Pin is connected to an adjustable resistance W
1, regulate W
1The sensitivity of scalable telegauge.
3, the telegauge of opposing electricity-stealing according to claim 1 is characterized in that adopting telescopic antenna in the remote measurement probe amplifier.
4, the telegauge of opposing electricity-stealing according to claim 1 is characterized in that pre-amplification circuit and power amplification circuit adopt same two power amplifier IC.
5, the telegauge of opposing electricity-stealing according to claim 1 is characterized in that detecting the gauge outfit indication is housed in the display circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92225450 CN2145388Y (en) | 1992-06-17 | 1992-06-17 | Anti-steal electric remote detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92225450 CN2145388Y (en) | 1992-06-17 | 1992-06-17 | Anti-steal electric remote detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2145388Y true CN2145388Y (en) | 1993-11-03 |
Family
ID=33770170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92225450 Expired - Fee Related CN2145388Y (en) | 1992-06-17 | 1992-06-17 | Anti-steal electric remote detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2145388Y (en) |
-
1992
- 1992-06-17 CN CN 92225450 patent/CN2145388Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |