CN2251145Y - Line checker with oscillator - Google Patents
Line checker with oscillator Download PDFInfo
- Publication number
- CN2251145Y CN2251145Y CN 95206174 CN95206174U CN2251145Y CN 2251145 Y CN2251145 Y CN 2251145Y CN 95206174 CN95206174 CN 95206174 CN 95206174 U CN95206174 U CN 95206174U CN 2251145 Y CN2251145 Y CN 2251145Y
- Authority
- CN
- China
- Prior art keywords
- oscillator
- line
- resistance
- utility
- current type
- 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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Abstract
The utility model relates to a line checker with an oscillator, which is used for secondary loop line check in electric disc cabinets. A1 and A2 are two sets of voltage comparators in four voltage comparators LM339. A driver (2) is provided with sounding elements. When the line is checked through, A2 outputs high frequency, and the driver makes a sound. At the time of checking lines in the loops of current type devices, two terminals are difficult to be distinguished in an ordinary line checking method because the direct current resistance of the current type device is small. The oscillator (1) of the utility model generates oscillating curren which is led into an inductance coil, and then inductive reactance voltage is generated. The utility model can effectively distinguish the two terminals of the current type device under the condition of without disconnecting the line.
Description
The utility model relates to a kind of device that carries out secondary circuit school line in the electrical panel cabinet.
The secondary line of electrical panel cabinet carries out distribution by electrical schematic diagram, the electrical panel cabinet of new clothes, and perhaps the electrical panel cabinet of interruption maintenance need check whether secondary line conforms to electrical schematic diagram.At present, when carrying out secondary circuit school line in the electrical panel cabinet, method commonly used has: 1. ohm retaining with analogy multimeter carries out the school line; 2. use homemade correcting line machine school line, promptly 3 volts of dry cells with draw two lines after 2.5 volts of torch bulbs are connected and carry out the school line; 3. use one grade of school line of digital versatile watchband hummer.More than three kinds of methods, all be to judge when utilizing direct current resistance less than certain numerical value.If by school line direct current resistance during less than certain numerical value, when 1. planting method school line with the, the little one side of multimeter pointer deflection ohm retaining scale.When 2. planting method school line with, bulb is lighted.When 3. planting method school line with, the hummer sounding.There is such problem with colonel's line method, when the loop of verification current type device,, can not judges two terminals of current type device like this because the direct current resistance of current type device is very little.Be connected to an end of current type device such as a lead from terminal strip one, when this root lead of verification, in order to last method, school line test pencil one be terminated at terminal strip, all there is the phenomenon of conducting at then another test pencil and current type device two ends.Can not distinguish the two ends of current type device like this, and these device two ends are connected to the lead of other device respectively.Now, when the loop of verification current type device, need take two terminated lines on the current type device apart and carry out the school line.So, both time-consuming, wrong when recovering line easily again.
The purpose of this utility model provides a kind of device that has oscillator, under the situation of not taking two terminated lines of current type device apart, can distinguish two terminals of current type effectively.
Wire of the present utility model is made of oscillator, detecting device and driver, and described oscillator comprises gate circuit F
1-F
6And resistance R
1, R
2, capacitor C
1, the output square wave of oscillator is through R
3Input is by comparer A after the current limliting
1, A
2And resistance R
4-R
10And capacitor C
2, diode VD
2, resistance R
7, the detecting device that constitutes of potentiometer RP, the voltage signal input of detecting device output comprises F
7-F
10, resistance R
11, R
12, capacitor C
3Oscillatory circuit that constitutes and the driver of piezoelectric ceramic piece HTD, output sound signal.
The wire of band oscillator of the present utility model adopts the input oscillator signal, by the mode that detecting device is handled, can distinguish two terminals of current type device effectively under the situation of not taking two terminated lines of current type device apart.Can school resistance little, the same lead that inductance is little, it is little and the coil of certain inductance is arranged again can the school to go out resistance, time saving and energy saving, can wrong, be specially adapted to the installation and maintenance of electrical panel cabinet.
Below by accompanying drawing embodiment of the present utility model is described further.
Accompanying drawing is depicted as according to the wire circuit diagram that the utility model proposes.
This wire since the current type device be by lead around coil, though direct current resistance is little, but certain inductance arranged.When telefault fed oscillating current, the coil two ends produced induction reactance voltage, and this voltage is directly proportional with the frequency that feeds coil.As shown in the figure, this wire is made of oscillator, detecting device and driver.Oscillator is by gate circuit F
1, F
2, F
3, F
4, F
5, F
6Resistance R
1, R
2And capacitor C
1Form.The square wave of output is through R
3Add to after the current limliting between the input end (B), (C) of this device.Detecting device is by voltage comparator A
1, A
2, resistance R
5, R
6, R
7, R
8, R
9, R
10, capacitor C
2, diode VD
2And potentiometer RP forms.A
1, A
2Two groups of voltage comparators among the four voltage comparator LM339 have been selected for use, resistance R
6, R
10Be respectively A
1, A
2Pull-up resistor.Potentiometer RP is used for regulation voltage comparer A
1The current potential of inverting input, the effect of diode VD1: when input end is connected to big telefault, make the energy in the coil pass through VD
1Discharge, protect this device internal circuit.When inserting same lead between input end (B), (C), because its direct current resistance is very little, inductance is also very little, A
1In-phase input end maximal value current potential is less than A
1The inverting input current potential, A
1Output low level, and A
2The in-phase input end current potential is higher than A
2The inverting input current potential, so, A
2The output high level.When the coil that inserts between input end (B), (C) greater than a certain inductance value, because the current potential that this coil produces changes within the specific limits, the current potential of the waveform that a part changes is higher than A
1The inverting input current potential, A
1Output is the high level waveform periodically, and this ripple is through diode VD
2Rectification, capacitor C
2, resistance R
7Deliver to A after the filtering
2Inverting input.Because A
2The inverting input current potential is higher than A
2The in-phase input end current potential makes A
2Output low level in like manner, when input end open circuit or access high resistance, also makes A
2Output low level.In sum, have only input end to insert small resistor, the A during lead of small inductor
2Just export high level.Driver comprises an oscillatory circuit and a piezoelectric ceramic piece HTD, and oscillatory circuit is by gate circuit F
7, F
8, F
9, F
10, resistance R
11, R
12And capacitor C
3Form.Work as A
2During the output high level, oscillatory circuit starting of oscillation, piezoelectric ceramic piece sounding; Work as A
2During output low level, the oscillatory circuit failure of oscillation, piezoelectricity pottery sheet is sounding not.
R in the utility model oscillator
2.C
1With R in the detecting device
7.C
2Must work good, can make R
7.C
2Greater than 10 times of R
2.C
1, but R
7.C
2Can not be excessive, otherwise, capacitor C
2It is too slow to discharge, and influences the wire operate as normal.Should be according to the test oscillator frequency greater than 20KHZ; A
1The inverting input current potential is adjustable in the 5mv-500mv scope.
This wire also can use CD4069 hex inverter integrated circuit to replace by F
1-F
6The gate circuit that constitutes replaces by F with CD4011 four or two input end Sheffer stroke gate integrated circuit
7-F
10The gate circuit that constitutes, when stating integrated circuit in the use, can be with F
8-F
10The input end short circuit, be used as an input end.
The power consumption of this device is little, can use 9 volts of laminated cell work, in addition, emphasizes a bit, and the utility model forbids to carry out the school line on charged circuit.
Claims (1)
1. the wire with oscillator is characterized in that, is made of oscillator, detecting device and driver, and described oscillator comprises gate circuit F
1-F
6And resistance R
1, R
2, capacitor C
1, the square wave of the output of oscillator is through R
3Input is by comparer A after the current limliting
1, A
2And resistance R
4-R
10And capacitor C
2, diode VD
2, resistance R
7, the detecting device that constitutes of potentiometer RP, the voltage signal input of detecting device output comprises F
7-F
10, resistance R
11, R
12, capacitor C
3Oscillatory circuit that constitutes and the driver of piezoelectric ceramic piece HTD, output sound signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95206174 CN2251145Y (en) | 1995-04-08 | 1995-04-08 | Line checker with oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95206174 CN2251145Y (en) | 1995-04-08 | 1995-04-08 | Line checker with oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2251145Y true CN2251145Y (en) | 1997-04-02 |
Family
ID=33858179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95206174 Expired - Fee Related CN2251145Y (en) | 1995-04-08 | 1995-04-08 | Line checker with oscillator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2251145Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018702A (en) * | 2012-12-03 | 2013-04-03 | 中国十七冶集团有限公司 | Fast checking method of high-voltage cabinet current transformer secondary loop line |
| CN109018835A (en) * | 2018-09-05 | 2018-12-18 | 张晨光 | A kind of photo resistance belt indulges this protective device |
-
1995
- 1995-04-08 CN CN 95206174 patent/CN2251145Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018702A (en) * | 2012-12-03 | 2013-04-03 | 中国十七冶集团有限公司 | Fast checking method of high-voltage cabinet current transformer secondary loop line |
| CN109018835A (en) * | 2018-09-05 | 2018-12-18 | 张晨光 | A kind of photo resistance belt indulges this protective device |
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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 |