差别

这里会显示出您选择的修订版和当前版本之间的差别。

到此差别页面的链接

两侧同时换到之前的修订记录 前一修订版
后一修订版
前一修订版
示波器 [2016/07/13 05:27]
gongyu [类型和型号]
示波器 [2019/03/10 18:28] (当前版本)
gongyu [参考设计]
行 1: 行 1:
-示波器,英文叫oscilloscope,​ 以前也称为oscillograph,​ 正式名字叫scope,​ CRO (阴极摄像管示波器),​ 或DSO (现在的数字示波器),​ 是电子测量仪器的一种,它能够观察固定变化的信号电压,​ 并将一个或多个信号的幅度以时间函数的方式进行二维显示,其它的信号比如声音或震动等可以转换成电压信号进行转换并显示。{{ :​440px-crt_oscilloscope.png |阴极射线管内部结构}} +===== 关于示波器 ===== 
-<WRAP centeralign>​**阴极射线管内部结构** </​WRAP>​ +示波器,英文叫oscilloscope,​ 以前也称为oscillograph,​ 正式名字叫scope,​ CRO (阴极摄像管示波器),​ 或DSO (现在的数字示波器),​ 是电子测量仪器的一种,它能够观察固定变化的信号电压,​ 并将一个或多个信号的幅度以时间函数的方式进行二维显示,其它的信号比如声音或震动等可以转换成电压信号进行转换并显示。
-{{ :​oscilloscopetek475a.jpg |Tektronix公司推出的475A型便携式模拟示波器,上世纪70年代的主流仪器}} +
-<WRAP centeralign>​ Tektronix公司推出的475A型便携式模拟示波器,上世纪70年代的主流仪器 </​WRAP>​+
  
-示波器被用来观察电信号随时间的变化,并在屏幕上以校准好的标尺将电压和时间显示出来,并能够分析被观察的波形的参数比如幅度、频率、上升时间、时间间隔、失真等。现在的数字仪器都可以计算并直接显示这些参数。+{{ :​440px-crt_oscilloscope.png |阴极射线管内部结构}}<​WRAP centeralign>​**阴极射线管内部结构** </​WRAP>​
  
-{{ :picoscope6000cdlaptop.jpg |}} +{{ :oscilloscopetek475a.jpg |Tektronix公司推出的475A型便携式模拟示波器,上世纪70年代的主流仪器}}<WRAP centeralign> ​Tektronix公司推出475A型便携式模拟示波器,上世纪70年代的主流仪器 ​</​WRAP>​
-<WRAP centeralign>​**PicoScope公司生产基于USB的数字示波器** </​WRAP>​+
  
 +示波器被用来观察电信号随时间的变化,并在屏幕上以校准好的标尺将电压和时间显示出来,并能够分析被观察的波形的参数比如幅度、频率、上升时间、时间间隔、失真等。现在的数字仪器都可以计算并直接显示这些参数。
 +
 +{{ :​picoscope6000cdlaptop.jpg |}} <WRAP centeralign>​**PicoScope公司生产的基于USB的数字示波器** </​WRAP>​
 + 
 示波器通过调整可以将重复的信号连续地在屏幕上显示,存储示波器可以捕捉单次事件并以相对较长的时间进行显示,这样可以观察到不容易直接接收到的快速变化的事件。 示波器通过调整可以将重复的信号连续地在屏幕上显示,存储示波器可以捕捉单次事件并以相对较长的时间进行显示,这样可以观察到不容易直接接收到的快速变化的事件。
-{{ :​handheld_oscilloscope_shs800.jpg |}} +{{ :​handheld_oscilloscope_shs800.jpg |}} <WRAP centeralign>​**Siglent公司生产的手持式数字存储示波器** </​WRAP>​ 
-<WRAP centeralign>​**Siglent公司生产的手持式数字存储示波器** </​WRAP>​+
 示波器被广泛用在科研、医疗、工程以及电信领域,通用的仪器被用在电子设备和实验室工作的维护中,专用的示波器可以用来比如分析汽车点火系统或在医疗中显示心跳的波形等。 示波器被广泛用在科研、医疗、工程以及电信领域,通用的仪器被用在电子设备和实验室工作的维护中,专用的示波器可以用来比如分析汽车点火系统或在医疗中显示心跳的波形等。
  
-Before the advent of digital electronics,​ oscilloscopes used cathode ray tubes (CRTs) as their display element (hence were commonly referred to as CROs) and linear amplifiers for signal processing. Storage oscilloscopes used special storage CRTs to maintain a steady display of a single brief signal. CROs were later largely superseded by digital storage oscilloscopes (DSOs) with thin panel displays, fast analog-to-digital converters and digital signal processors. DSOs without integrated displays (sometimes known as digitisers) are available at lower cost and use a general-purpose digital computer to process and display waveforms. 
- 
-====功能和应用==== 
-===综述=== 
 {{ :​wtpc_oscilloscope-1.jpg |}} {{ :​wtpc_oscilloscope-1.jpg |}}
 <WRAP centeralign>​**通用的示波器** </​WRAP>​ <WRAP centeralign>​**通用的示波器** </​WRAP>​
行 39: 行 36:
  
 ===探头=== ===探头===
 +
 +=====分类=====
 +=====主要厂商=====
 +=====关键指标=====
 +====模拟带宽====
 +====采样率====
 +====灵敏度====
 +====动态范围====
 +====存储深度====
 +
 +=====主要功能和使用=====
 +====探头====
 Open wire test leads (flying leads) are likely to pick up interference,​ so they are not suitable for low level signals. Furthermore,​ the leads have a high inductance, so they are not suitable for high frequencies. Using a shielded cable (i.e., coaxial cable) is better for low level signals. Coaxial cable also has lower inductance, but it has higher capacitance:​ a typical 50 ohm cable has about 90 pF per meter. Consequently,​ a one-meter direct (1X) coaxial probe will load a circuit with a capacitance of about 110 pF and a resistance of 1 megohm. Open wire test leads (flying leads) are likely to pick up interference,​ so they are not suitable for low level signals. Furthermore,​ the leads have a high inductance, so they are not suitable for high frequencies. Using a shielded cable (i.e., coaxial cable) is better for low level signals. Coaxial cable also has lower inductance, but it has higher capacitance:​ a typical 50 ohm cable has about 90 pF per meter. Consequently,​ a one-meter direct (1X) coaxial probe will load a circuit with a capacitance of about 110 pF and a resistance of 1 megohm.
  
行 54: 行 63:
  
 A more-sophisticated probe includes a magnetic flux sensor (Hall effect sensor) in the magnetic circuit. The probe connects to an amplifier, which feeds (low frequency) current into the coil to cancel the sensed field; the magnitude of that current provides the low-frequency part of the current waveform, right down to DC. The coil still picks up high frequencies. There is a combining network akin to a loudspeaker crossover network. A more-sophisticated probe includes a magnetic flux sensor (Hall effect sensor) in the magnetic circuit. The probe connects to an amplifier, which feeds (low frequency) current into the coil to cancel the sensed field; the magnitude of that current provides the low-frequency part of the current waveform, right down to DC. The coil still picks up high frequencies. There is a combining network akin to a loudspeaker crossover network.
 +====耦合和极性====
 +====面板操作====
 +====扫描====
 +====触发====
 +====存储====
 +====参数测量====
 +====频谱分析====
 +
 +=====示波器的制作=====
 +====硬件====
 +====软件====
 +====参考设计案例====
 +
 +=====参考资料=====
 +====使用说明书====
 +====使用XYZ====
 +
 +=====使用技巧=====
  
 ====前面板控制==== ====前面板控制====
行 355: 行 382:
 Other instruments convert the results of their measurements to a repetitive electrical signal, and incorporate an oscilloscope as a display element. Such complex measurement systems include spectrum analyzers, transistor analyzers, and time domain reflectometers (TDRs). Unlike an oscilloscope,​ these instruments automatically generate stimulus or sweep a measurement parameter. Other instruments convert the results of their measurements to a repetitive electrical signal, and incorporate an oscilloscope as a display element. Such complex measurement systems include spectrum analyzers, transistor analyzers, and time domain reflectometers (TDRs). Unlike an oscilloscope,​ these instruments automatically generate stimulus or sweep a measurement parameter.
  
-====历史==== 
-The Braun tube was known in 1897, and in 1899 Jonathan Zenneck equipped it with beam-forming plates and a magnetic field for sweeping the trace.[citation needed] Early cathode ray tubes had been applied experimentally to laboratory measurements as early as the 1920s, but suffered from poor stability of the vacuum and the cathode emitters. V. K. Zworykin described a permanently sealed, high-vacuum cathode ray tube with a thermionic emitter in 1931. This stable and reproducible component allowed General Radio to manufacture an oscilloscope that was usable outside a laboratory setting.[3] After World War II surplus electronic parts became the basis of revival of Heathkit Corporation,​ and a $50 oscilloscope kit made from such parts was a first market success. 
  
 ====参考资料==== ====参考资料====
行 408: 行 433:
 ===Digilent Analog Discovery 2 产品简介=== ===Digilent Analog Discovery 2 产品简介===
  
-Digilent Analog Discovery 2 is a USB oscilloscope and multi-function instrument that allows users to measure, visualize, generate, record, and control mixed-signal circuits of all kinds. Developed in conjunction with Analog Devices and supported by Xilinx University Program, Analog Discovery 2 is small enough to fit in your pocket, but powerful enough to replace a stack of lab equipment, providing engineering students, hobbyists, and electronics enthusiasts the freedom to work with analog and digital circuits in virtually any environment,​ in or out of the lab. The analog and digital inputs and outputs can be connected to a circuit using simple wire probes; alternatively,​ the Analog Discovery ​BNC Adapter and BNC probes can be used to connect and utilize the inputs and outputs. Driven by the free WaveForms 2015 (Mac, Linux and Windows Compatible) software, Analog Discovery 2 can be configured to work as any one of several traditional instruments. ​+Digilent Analog Discovery 2 是一款基于USB的示波器/多功能仪器,用于测量、可视化、产生、录制以及控制所有种类的混合信号电路。模拟和数字信号的输入/输出可以通过简单的连线同待测的电路进行连接也可以通过提供的BNC适配器和BNC探头进行连接。
  
-For more information on the differences between Analog Discovery and Analog Discovery 2, please visit our resource center. +主要性能指标
-Features+  * 双通道USB数字示波器(1MΩ, ±25V, ​差分, 14-bit, 100Msample/​sec,​ 30MHz+带宽 ​使用Analog Discovery带的BNC适配板
-  * Two-channel ​USB digital oscilloscope ​(1MΩ, ±25V, ​differential, 14-bit, 100Msample/​sec,​ 30MHz+ ​bandwidth ​with the Analog Discovery BNC Adapter Board+  * 双通道任意函数发生器(±5V, 14-bit, 100Msample/​sec,​ 20MHz+带宽 ​使用Analog Discovery带的BNC适配板
-  * Two-channel arbitrary function generator ​(±5V, 14-bit, 100Msample/​sec,​ 20MHz+ ​bandwidth ​with the Analog Discovery BNC Adapter Board+  * 立体声音频放大器用以驱动外部的耳机或喇叭 
-  * Stereo audio amplifier to drive external headphones or speakers with replicated AWG signals +  * 16通道数字逻辑分析仪(3.3V CMOS, 100Msample/​sec) 
-  * 16-channel digital logic analyzer ​(3.3V CMOS, 100Msample/​sec) +  * 16通道模式发生器(3.3V CMOS, 100Msample/​sec) 
-  * 16-channel pattern generator ​(3.3V CMOS, 100Msample/​sec) +  * 16通道虚拟数字I/O包括按钮、开关、LEDs – 非常适用于逻辑训练应用 
-  * 16-channel virtual digital ​I/O including buttons, switches, and LEDs – perfect for logic training applications +  * 两个输入/输出数字触发信号用以连接多个设备(3.3V CMOS) 
-  * Two input/​output digital trigger signals for linking multiple instruments ​(3.3V CMOS) +  * 单通道电压表(AC, DC, ±25V) 
-  * Single channel voltmeter ​(AC, DC, ±25V) +  * 网络分析仪 ​– Bode, Nyquist, Nichols transfer diagrams of a circuit. Range: 1Hz to 10MHz 
-  * Network analyzer ​– Bode, Nyquist, Nichols transfer diagrams of a circuit. Range: 1Hz to 10MHz +  * 频谱分析仪 ​– power spectrum and spectral measurements (noise floor, SFDR, SNR, THD, etc.) 
-  * Spectrum Analyzer ​– power spectrum and spectral measurements (noise floor, SFDR, SNR, THD, etc.) +  * 数字总线分析仪(SPI, I²C, UART, 串行
-  * Digital Bus Analyzers ​(SPI, I²C, UART, Parallel+  * 两个可编程电源(0…+5V , 0…-5V). ​最大可输出电流以及功率取决于Analog Discovery 2的供电选择
-  * Two programmable power supplies ​(0…+5V , 0…-5V). ​The maximum available output current and power depend on the Analog Discovery 2 powering choice+    通过USB供电,可以每一路提供最大250mW或总计500mW 
-  * 250mW max for each supply or 500mW total when powered through USB +    通过外部电源适配器每一路可以提供最大700mA2.1W
-  * 700mA max or 2.1W max for each supply when using an external wall power supply+
  
 [[Analog Discovery 2 参考手册]] [[Analog Discovery 2 参考手册]]
  
 +[[基于树莓派的双通道高速ADC的设计]]