CN103809003A - Isolator for testing signal voltage waveforms - Google Patents
Isolator for testing signal voltage waveforms Download PDFInfo
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- CN103809003A CN103809003A CN201410026065.3A CN201410026065A CN103809003A CN 103809003 A CN103809003 A CN 103809003A CN 201410026065 A CN201410026065 A CN 201410026065A CN 103809003 A CN103809003 A CN 103809003A
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Abstract
本发明涉及通信信号测试设备，具体地说是一种用于信号电压波形测试的隔离器，所述隔离器内封装有一个集成运算放大器电路，所述隔离器的外部设有用于连接被测信号的输入信号接点、用于连接被测信号地线的输入地线接点、用于向测试设备输出测量信号的输出信号接点、用于连接测试设备地线的输出地线接点和电源开关按键，集成运算放大器的正向输入端与输入信号接点连接，集成运算放大器的信号输出端分别与其反相输入端和输出信号接点连接，本发明专为信号电压波形测试之用，将其接在被测信号与测试设备之间，能够隔离测试设备对原测试信号的反馈阻抗影响，使原待测信号电压波形保持不变，从而使测量获得更为理想、精确和可靠的测试结果。
The present invention relates to communication signal testing equipment, in particular to an isolator for testing signal voltage waveforms. The isolator is packaged with an integrated operational amplifier circuit. The input signal contact, the input ground contact used to connect the signal ground wire under test, the output signal contact used to output the measurement signal to the test equipment, the output ground wire contact and the power switch button used to connect the test equipment ground wire, integrated The positive input terminal of the operational amplifier is connected to the input signal contact, and the signal output terminal of the integrated operational amplifier is respectively connected to its inverting input terminal and output signal contact. Between the test equipment and the test equipment, it can isolate the influence of the feedback impedance of the test equipment on the original test signal, so that the voltage waveform of the original signal to be tested remains unchanged, so that the measurement can obtain more ideal, accurate and reliable test results.
Description
技术领域 technical field
本发明涉及通信信号测试设备，具体地说是一种用于信号电压波形测试的隔离器。 The present invention relates to communication signal test equipment, in particular to an isolator for signal voltage waveform test.
背景技术 Background technique
信号电压波形测试是电子测量中的常见操作，但是当一个信号测试点需连接多个测试设备时，由于多个测试设备同时工作的综合阻抗常会对被测信号造成较大负载影响，反过来导致被测信号电压波形发生畸变，这会明显影响测试的准确性。有时，测试设备甚至累及被测信号源停止工作，使测试无法进行。然而，市场上常见的信号隔离器，如变压器式和光电耦合式等隔离器，通常是在信号的中继与传输场合使用，对信号一般都有一定的传输衰减或者变换作用，因而通常不适合信号波形测试场合之用。 Signal voltage waveform test is a common operation in electronic measurement, but when a signal test point needs to be connected to multiple test equipment, the combined impedance of multiple test equipment working at the same time often causes a large load impact on the signal under test, which in turn causes The measured signal voltage waveform is distorted, which will obviously affect the accuracy of the test. Sometimes, the test equipment even involves the signal source under test to stop working, making the test impossible. However, the common signal isolators on the market, such as transformer-type and photocoupler-type isolators, are usually used in signal relay and transmission occasions, and generally have a certain transmission attenuation or conversion effect on signals, so they are usually not suitable For signal waveform test occasions.
发明内容 Contents of the invention
针对上述现有技术中多个测试设备同时工作时的综合阻抗对被测信号造成较大负载影响，反过来导致被测信号电压波形发生畸变等的缺陷，使测试不准确的情形，本发明提供一种用于信号电压波形测试的隔离器。 Aiming at the situation in the above-mentioned prior art that the comprehensive impedance of multiple testing devices working at the same time has a large load impact on the tested signal, which in turn causes the voltage waveform of the tested signal to be distorted, making the test inaccurate, the present invention provides An isolator for signal voltage waveform testing.
为解决上述技术问题，本发明采用的技术方案为： In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
一种用于信号电压波形测试的隔离器，所述隔离器内封装有一个集成运算放大器电路，所述隔离器的外部设有用于连接被测信号的输入信号接点、用于连接被测信号地线的输入地线接点、用于向测试设备输出测量信号的输出信号接点、用于连接测试设备地线的输出地线接点和电源开关按键，集成运算放大器的正向输入端与输入信号接点连接，集成运算放大器的信号输出端分别与其反相输入端和输出信号接点连接，所述集成运算放大器的正、负供电端分别接有电池Ⅰ和电池Ⅱ，所述的电池Ⅰ和电池Ⅱ均串接有电阻、指示灯和开关，且与电池Ⅰ和电池Ⅱ连接的双联开关均由电源开关按键控制通断。 An isolator for signal voltage waveform testing, the isolator is packaged with an integrated operational amplifier circuit, and the isolator is externally provided with input signal contacts for connecting the signal under test, and for connecting the ground of the signal under test The input ground contact of the line, the output signal contact used to output the measurement signal to the test equipment, the output ground contact used to connect the test equipment ground and the power switch button, the positive input terminal of the integrated operational amplifier is connected to the input signal contact , the signal output terminal of the integrated operational amplifier is respectively connected to its inverting input terminal and the output signal contact, the positive and negative power supply terminals of the integrated operational amplifier are respectively connected to battery I and battery II, and the battery I and battery II are connected in series Resistors, indicator lights and switches are connected, and the double switch connected to battery I and battery II is controlled by the power switch button.
本发明的有益效果： Beneficial effects of the present invention:
本发明提供的隔离器，专为信号电压波形测试之用，测试信号电压波形时，将其接在被测信号与测试设备之间，能够隔离测试设备对原测试信号的反馈阻抗影响，使原待测信号电压波形保持不变，同时也能使测试设备处于最佳测试状态，从而使测量获得更为理想、精确和可靠的测试结果； The isolator provided by the present invention is specially used for signal voltage waveform testing. When testing the signal voltage waveform, it is connected between the tested signal and the test equipment, which can isolate the influence of the feedback impedance of the test equipment on the original test signal, so that the original The voltage waveform of the signal to be tested remains unchanged, and at the same time, the test equipment can be in the best test state, so that the measurement can obtain more ideal, accurate and reliable test results;
本发明提供的隔离器，电路成本低廉，如运放UA741每片售价不足1元，使用多只运放并联，还可做成多路输出，本发明产品体积小巧，便于携带，使用也极为简单和方便，可以广泛使用在有关实验室、电子产品维修等电子测量场合。 The circuit cost of the isolator provided by the invention is low. For example, the price of each piece of op amp UA741 is less than 1 yuan. Using multiple op amps in parallel can also make multiple outputs. The product of the invention is small in size, easy to carry, and extremely easy to use. Simple and convenient, it can be widely used in relevant laboratories, electronic product maintenance and other electronic measurement occasions.
附图说明 Description of drawings
图1 本发明的结构示意图； Fig. 1 structural representation of the present invention;
图2 本发明的内部电路原理示意图； Fig. 2 schematic diagram of internal circuit principle of the present invention;
附图标记：1、输入信号接点，2、输入地线接点，3、输出信号接点，4、输出地线接点，5、电源开关按键，6、电池Ⅰ通电指示灯，7、电池Ⅱ通电指示灯，8、电池仓盖，9、电池Ⅰ，10、电池Ⅱ，11、发光二极管Ⅰ，12、发光二极管Ⅱ，13、电阻Ⅰ，14、电阻Ⅱ， 15、双联开关，16、集成运放。 Reference signs: 1. Input signal contact, 2. Input ground contact, 3. Output signal contact, 4. Output ground contact, 5. Power switch button, 6. Battery I power-on indicator light, 7. Battery II power-on indicator Light, 8, battery compartment cover, 9, battery Ⅰ, 10, battery Ⅱ, 11, light-emitting diode Ⅰ, 12, light-emitting diode Ⅱ, 13, resistance Ⅰ, 14, resistance Ⅱ, 15, double switch, 16, integrated operation put.
具体实施方式 Detailed ways
下面结合具体实施方式对本发明做进一步的阐述。 The present invention will be further elaborated below in combination with specific embodiments.
如图1和2所示：一种用于信号电压波形测试的隔离器，所述隔离器内封装有一个集成运算放大器电路，所述隔离器的外部设有用于连接被测信号的输入信号接点1、用于连接被测信号地线的输入地线接点2、用于向测试设备输出测量信号的输出信号接点3、用于连接测试设备地线的输出地线接点4和电源开关按键5，集成运算放大器的正向输入端与输入信号接点1连接，集成运算放大器的信号输出端分别与其反相输入端和输出信号接点3连接，所述集成运算放大器的正、负供电端分别接有电池Ⅰ9和电池Ⅱ10，所述的电池Ⅰ9和电池Ⅱ10均串接有电阻、指示灯和开关，且与电池Ⅰ9和电池Ⅱ10连接的双联开关15均由电源开关按键5控制通断。
As shown in Figures 1 and 2: an isolator for signal voltage waveform testing, the isolator is packaged with an integrated operational amplifier circuit, and the outside of the isolator is provided with an input signal contact for connecting the signal to be tested 1. The input ground contact for connecting the signal ground to be tested 2, the output signal contact for outputting the measurement signal to the
根据运放特性，此时U+=U-=UO，即输出电压恒等于输入电压，而与后级所接设备阻抗无关。理论上，运放的输入阻抗无穷大，亦即本隔离器对被测信号没有任何影响，而运放的输出阻抗无穷小，即本隔离器对测试设备的输出内阻趋于零，这就更有利于测试设备工作，使测试设备处于最佳测试状态。电池开关为双联控制两节电池的供电通断，并配合以指示灯标示。 According to the characteristics of the operational amplifier, U + =U-=U O at this time, that is, the output voltage is always equal to the input voltage, regardless of the impedance of the equipment connected to the subsequent stage. Theoretically, the input impedance of the operational amplifier is infinite, that is, the isolator has no influence on the signal under test, and the output impedance of the operational amplifier is infinitely small, that is, the output internal resistance of the isolator to the test equipment tends to zero, which is even more It is conducive to the work of the test equipment, so that the test equipment is in the best test state. The battery switch is dual-connected to control the power supply on and off of the two batteries, and is marked with an indicator light.
以UA741通用型集成运放为例，如果采用仪表中常用的9V电池供电，可以将隔离器的适用信号的测试幅度范围扩大至接近正负9V，已可满足通常的信号测试需要。 Taking the UA741 general-purpose integrated operational amplifier as an example, if the 9V battery commonly used in instruments is used for power supply, the test range of the applicable signal of the isolator can be expanded to close to plus or minus 9V, which can meet the usual signal test needs.
所述的集成运放可以采用UA741型集成运放，此集成运放的2脚连接输出端6脚，4脚接电池Ⅰ9的负极，7脚接电池Ⅱ10的正极，被测信号从3脚输入，6脚或者2脚作为信号的隔离输出至测试设备，1脚和5脚作为调试之用，8脚悬空。
The integrated op amp can be UA741 integrated op amp.
当需要对被测信号电压波形进行测试时，只要将本发明接在被测信号与测试设备之间，打开电源开关按键5即可，如图1，即：将被测信号连接隔离器输入信号接点1，被测信号地线连接隔离器输入接地点2；隔离器输出信号接点3连接测试设备信号探测线，隔离器输出接地点4连接测试设备探测地线；打开开关5，发光二极管Ⅰ11和发光二极管Ⅱ12点亮，本隔离器开始工作，测试进行。
When it is necessary to test the voltage waveform of the signal under test, just connect the present invention between the signal under test and the test equipment, and turn on the power switch button 5, as shown in Figure 1, that is, connect the signal under test to the input signal of the
多次实验表明，对于信号测试时须接入多个测试设备而导致无法正常工作和测试的情形，只要将本发明按照上述方法接入，就可以隔离测试设备与被测信号相互间影响，从而获得理想和准确的信号电压波形等测试结果。 Many experiments have shown that, for the situation that a plurality of test equipments must be connected during the signal test and thus cannot work and test normally, as long as the present invention is connected according to the above method, the mutual influence between the test equipment and the signal under test can be isolated, thereby Obtain ideal and accurate test results such as signal voltage waveforms.
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| CN202330542U (en) * | 2011-11-17 | 2012-07-11 | 成都可为科技发展有限公司 | Voltage following circuit based on integrated operational amplification chip |
| CN202494943U (en) * | 2012-02-23 | 2012-10-17 | 樱花卫厨（中国）股份有限公司 | Adjustable constant-voltage constant-current-source circuit |
| CN203259574U (en) * | 2013-04-24 | 2013-10-30 | 中节能绿洲(北京)太阳能科技有限公司 | DC high-voltage detection circuit with high impedance input |
| CN203688620U (en) * | 2014-01-20 | 2014-07-02 | 河南科技大学 | Isolator used for signal voltage waveform test |
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2014
- 2014-01-20 CN CN201410026065.3A patent/CN103809003A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101651412A (en) * | 2009-06-26 | 2010-02-17 | 上海大学 | Method of converting single power to dual power, voltage follower, virtual ground and pseudo ground generator, and DC regulated power |
| US20110260770A1 (en) * | 2010-04-27 | 2011-10-27 | Oki Semiconductor Co., Ltd. | Method and semiconductor device for monitoring battery voltages |
| CN102508016A (en) * | 2011-10-31 | 2012-06-20 | 重庆长安汽车股份有限公司 | Voltage detection circuit of motor controller for electric vehicle |
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Application publication date: 20140521 |