======使用BNC适配器入门===== ~~ TechAlicle ~~模拟发现工具的BNC适配器可以使用标准的BNC终止测试引线和探头，以实现示波器工具的更好衰减[[//www.knowreader.com/shop/software/digilent-waveforms/ |waveforms软件]]。---- ==库存== *模拟发现工具（[[//www.knowreader.com/reference/test-dis-mearurement/analog-discovery/start | analog discovery regacy]]或[https：//Digilent.com/shop/analog-discovery-2-100ms-s-usb-oscilloscope-logic-analyzer-and-variabiese-power-supply/ | Analog Discovery 2]]）* [https：//www.knowreader.com/Shop / BNC-Adapter-for模拟发现/ | BNC适配器电路板]] * BNC终止探头，如来自DigIlent的探针（[[//www.knowreader.com/shop/bnc-oscilloscope-x1-x10-probes-pair / | bnc探针]] * [[//www.knowreader.com/shop/software/digilent-waveforms/ | waveforms软件]] *带有USB端口的计算机运行软件*带电池的9V电池夹子* 1220μF电解电容* 110kΩ电阻（棕色，黑色，橙色）*用户控制的开关* 1带跳线的面包板---- ====背景==== BNC探头用于启用测量比示波器通常可以测量的更高电压信号。探头通过改变电压的输入来实现这一点由示波器看到的ance通过衰减信号来完成，通常通过10倍。模拟发现工具只能显示最大50 V峰值（限制-25 V至+ 25 V），因此无法安全衡为200 V信号。来自Digilent的范围引线能够处理该电压，并且还可以使用10x衰减来呈现20V信号，而是可以显示模拟发现2示波器输入。因为BNC适配器允许与模拟发现工具一起使用的BNC探头，所以可以使用比模拟发现工具传统地实现更高的带宽。 ==== Demonstration ==== A simple circuit can be created to demonstrate the use of the BNC Adapter. {{ :learn:instrumentation:tutorials:bnc-adapter:bnc_test_circuit.png | Simple Circuit for the BNC Adapter}} To easily see the effect of attenuation, attach both probe leads to the positive side of the capacitor (the wire labeled W1 in the diagram above). These leads are attached to the positive scope inputs on the Analog Discovery; the negative scope inputs on the Analog Discovery tool are grounded on the BNC Adapter so only single ended measurements can be taken. Be sure to also attach the probe ground clips to ground as well to avoid shorting the probe as the BNC adapter board does not support differential voltage measurements. {{ :learn:instrumentation:tutorials:bnc-adapter:bnc_circuit_setup.jpg?700 |Full BNC Circuit setup}} {{ :learn:instrumentation:tutorials:bnc-adapter:bnc_circuit_close_up.jpg?700 |BNC Circuit setup up close}} When the two Oscilloscope channels are set to be DC coupled on the BNC adapter, the following waveform can be observed when the switch is turned off, disconnecting the power to the circuit. Notice that the voltage amplitude on Channel 2 (10X compensated probe signal) is proportionately 10 times smaller than Channel 1 which is not applying any attenuation. {{ :learn:instrumentation:tutorials:ad2-oscilloscope:oscilloscope53.png?700 | AC/DC coupling.}} {{ :learn:instrumentation:tutorials:bnc-adapter:waveforms_2015_broad_view.png?700 | Comparison of the two different types of signal attenuation}} It is possible to proportionally change the attenuated signal to reflect the actual signal voltage by clicking on the gear box associated with the oscilloscope channel measuring the attenuated signal and changing the "Attenuation" dropdown box to match the attenuation level. This helps reveal some information about a large signal that is outside the recommended voltage range for an oscilloscope. {{ :learn:instrumentation:tutorials:bnc-adapter:waveforms_attenuation_refix.png | Changing the attenuation inside WaveForms}} The BNC adapter also supports a AC coupled setting to create a high pass filter and remove any DC offset from the sinusoidal signal. More information on the BNC Adapter can be found on its [[test-and-measurement:bnc-adapter-board:start|Resource Center]]. All questions about the BNC Adapter can be asked on the [[https://forum.digilentinc.com/forum/8-test-and-measurement/|Test and Measurement]] section of the Digilent Forum. {{tag>instrumentation tutorial bnc-adapter analog-discovery analog-discovery-2 oscilloscope bnc probes}}