CN203688620U - Isolator used for signal voltage waveform test - Google Patents
Isolator used for signal voltage waveform test Download PDFInfo
- Publication number
- CN203688620U CN203688620U CN201420033493.4U CN201420033493U CN203688620U CN 203688620 U CN203688620 U CN 203688620U CN 201420033493 U CN201420033493 U CN 201420033493U CN 203688620 U CN203688620 U CN 203688620U
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- signal
- isolator
- ground wire
- operational amplifier
- battery
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Abstract
The utility model relates to a communication signal test device, and specifically relates to an isolator used for a signal voltage waveform test. An integrated operational amplifier circuit is packaged in the isolator. The isolator is externally provided with an input signal contact used for being connected with tested signals, an input ground wire contact used for being connected with a ground wire of tested signals, an output signal contact used for outputting measurement signals to a test device, an output ground wire contact used for being connected with a ground wire of the test device, and a power supply switch button. A positive input end of an integrated operational amplifier is connected with the input signal contact, signal output ends of the integrated operational amplifier are respectively connected with an inverted input end of the integrated operational amplifier and the output signal contact. The isolator is specially used for the signal voltage waveform test, and the isolator is connected between the tested signals and the test device to isolate the feedback impedance influence of the test device on the original tested signals, so that the voltage waveform of the original signals to be tested remains unchanged, and the measurement result is more ideal, accurate and reliable.
Description
Technical field
The utility model relates to signal of communication testing apparatus, specifically a kind of isolator for voltage waveform signal test.
Background technology
Voltage waveform signal test is the common operation in electronic surveying; but in the time that a signal testing point needs to connect multiple testing apparatus; the comprehensive impedance of simultaneously working due to multiple testing apparatuss often can cause compared with heavy load and affect measured signal; cause conversely measured signal voltage waveform to distort, this is the accuracy of impact test obviously.Sometimes, testing apparatus is even involved measured signal source and is quit work, and test cannot be carried out.But, common signal isolator on market, as the isolator such as transformer type and photoelectric coupling type, normally uses with transmission occasion at the relaying of signal, signal is generally had to certain transmission attenuation or change action, thereby be conventionally not suitable for the use of signal waveform test occasion.
Utility model content
Comprehensive impedance when multiple testing apparatuss are worked simultaneously in above-mentioned prior art causes compared with heavy load and affects measured signal, cause conversely measured signal voltage waveform occur distortion etc. defect, make to test inaccurate situation, the utility model provides a kind of isolator for voltage waveform signal test.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is:
A kind of isolator for voltage waveform signal test, in described isolator, be packaged with an integrated operational amplifier circuit, the outside of described isolator is provided with the input signal contact for connecting measured signal, for connecting the input ground wire contact of measured signal ground wire, for the output signal contact to testing apparatus output measuring-signal, for output ground wire contact and the power switch button of connecting test equipment ground wire, the positive input of integrated operational amplifier is connected with input signal contact, the signal output part of integrated operational amplifier is connected with its inverting input and output signal contact respectively, described integrated operational amplifier just, negative feeder ear is connected to respectively battery I and battery II, described battery I and battery II are all serially connected with resistance, pilot lamp and switch, and the ganged switch being connected with battery I and battery II by power switch by key control break-make.
The beneficial effects of the utility model:
The isolator that the utility model provides, aim at the use of voltage waveform signal test, when test signal voltage waveform, be connected between measured signal and testing apparatus, can the feedback impedance of former test signal be affected isolation test equipment, former measured signal voltage waveform is remained unchanged, also can make testing apparatus in best test mode, thereby make to measure even more ideal, the accurate and reliable test result of acquisition simultaneously;
The isolator that the utility model provides, circuit cost is cheap, as 1 yuan of every price less than of amplifier UA741, use many amplifier parallel connections, also can make multichannel output, the utility model small product size is small and exquisite, is easy to carry, use is also very simple and convenient, can be widely used in the electronic surveying occasion such as relevant laboratory, electronic product maintenance.
Accompanying drawing explanation
Fig. 1 structural representation of the present utility model;
Fig. 2 internal circuit principle schematic of the present utility model;
Reference numeral: 1, input signal contact, 2, input ground wire contact, 3, output signal contact, 4, output ground wire contact, 5, power switch button, 6, battery I electromotion pilot lamp, 7, battery II electromotion pilot lamp, 8, battery cabin cap, 9, battery I, 10, battery II, 11, light emitting diode I, 12, light emitting diode II, 13, resistance I, 14, resistance II, 15, ganged switch, 16, integrated transporting discharging.
Embodiment
Below in conjunction with embodiment, the utility model is further elaborated.
As illustrated in fig. 1 and 2: a kind of isolator for voltage waveform signal test, in described isolator, be packaged with an integrated operational amplifier circuit, the outside of described isolator is provided with the input signal contact 1 for connecting measured signal, for connecting the input ground wire contact 2 of measured signal ground wire, for the output signal contact 3 to testing apparatus output measuring-signal, for output ground wire contact 4 and the power switch button 5 of connecting test equipment ground wire, the positive input of integrated operational amplifier is connected with input signal contact 1, the signal output part of integrated operational amplifier is connected with its inverting input and output signal contact 3 respectively, described integrated operational amplifier just, negative feeder ear is connected to respectively battery I 9 and battery II 10, described battery I 9 and battery II 10 are all serially connected with resistance, pilot lamp and switch, and the ganged switch 15 being connected with battery I 9 and battery II 10 is controlled break-make by power switch button 5.
According to amplifier characteristic, now U
+=U-=U
o, output voltage is constantly equal to input voltage, and irrelevant with the impedance of rear class connected equipment.In theory, the input impedance infinity of amplifier, that is this isolator on measured signal without any impact, and the output impedance infinitesimal of amplifier, be that this isolator goes to zero to the output internal resistance of testing apparatus, this is just more conducive to testing apparatus work, makes testing apparatus in best test mode.Cell switch is the power supply break-make of duplex control two batteries, and cooperation indicates with pilot lamp.
Take the universal integrated transporting discharging of UA741 as example, if adopt conventional 9V powered battery in instrument, the test amplitude range of the application signal of isolator can be extended to and approach positive and negative 9V, can meet common signal testing needs.
Described integrated transporting discharging can adopt UA741 type integrated transporting discharging, 2 pin of this integrated transporting discharging connect output terminal 6 pin, 4 pin connect the negative pole of battery I 9,7 pin connect the positive pole of battery II 10, measured signal is inputted from 3 pin, 6 pin or the signal isolation of 2 pin export testing apparatus to, and 1 pin and 5 pin are as the use of debugging, and 8 pin are unsettled.
In the time that needs are tested measured signal voltage waveform, as long as the utility model is connected between measured signal and testing apparatus, turn on the power switch button 5, as Fig. 1, that is: measured signal is connected to isolator input signal contact 1, measured signal ground wire connects isolator input grounding point 2; Isolator output signal contact 3 connecting test device signal are surveyed line, and isolator output earth point 4 connecting test equipment are surveyed ground wire; Open switch 5, light emitting diode I 11 and light emitting diode II 12 are lighted, and this isolator is started working, and test is carried out.
Many experiments shows, during for signal testing, must access multiple testing apparatuss and cause the situation that cannot normally work and test, as long as the utility model is accessed according to the method described above, just can isolation test equipment and measured signal affect each other, thereby obtain the desirable and test result such as voltage waveform signal accurately.
Claims (1)
1. the isolator for voltage waveform signal test, it is characterized in that: in described isolator, be packaged with an integrated operational amplifier circuit, the outside of described isolator is provided with the input signal contact (1) for connecting measured signal, for connecting the input ground wire contact (2) of measured signal ground wire, for the output signal contact (3) to testing apparatus output measuring-signal, for output ground wire contact (4) and the power switch button (5) of connecting test equipment ground wire, the positive input of integrated operational amplifier is connected with input signal contact (1), the signal output part of integrated operational amplifier is connected with its inverting input and output signal contact (3) respectively, described integrated operational amplifier just, negative feeder ear is connected to respectively battery I (9) and battery II (10), described battery I (9) and battery II (10) are all serially connected with resistance, pilot lamp and switch, and the ganged switch (15) being connected with battery I (9) and battery II (10) is controlled break-make by power switch button (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420033493.4U CN203688620U (en) | 2014-01-20 | 2014-01-20 | Isolator used for signal voltage waveform test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420033493.4U CN203688620U (en) | 2014-01-20 | 2014-01-20 | Isolator used for signal voltage waveform test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203688620U true CN203688620U (en) | 2014-07-02 |
Family
ID=51010505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420033493.4U Expired - Fee Related CN203688620U (en) | 2014-01-20 | 2014-01-20 | Isolator used for signal voltage waveform test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203688620U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809003A (en) * | 2014-01-20 | 2014-05-21 | 河南科技大学 | Isolator for testing signal voltage waveforms |
-
2014
- 2014-01-20 CN CN201420033493.4U patent/CN203688620U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809003A (en) * | 2014-01-20 | 2014-05-21 | 河南科技大学 | Isolator for testing signal voltage waveforms |
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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 |
Granted publication date: 20140702 Termination date: 20150120 |
|
| EXPY | Termination of patent right or utility model |