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示波器 [2019/03/10 15:18] gongyu |
示波器 [2019/03/10 18:28] (当前版本) gongyu [参考设计] |
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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。 | ||
- | =====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> | ||
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===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. | ||
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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==== | ||
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[[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]] |