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嗨,我正在使用DSO-X 3034A系列工作在一个简单的RC电路上,以验证电容器放电电压在1毫秒到680欧姆之间。
理论上我使用公式V = 12 *(exp(-0.01 /(4.7uF * 680)))计算得出8.77V但是使用DSO我无法验证它。 实际上,当我用DSO测量时,放电到5V。 我已经附加了RC电路和捕获的波形。 以下是我遵循的测试程序1.将下降沿触发和触发电平设置为8V。 2.将CRO探头(10:1)连接到C1并按SW1直到帽充电至12V。 3.按DSO上的单一捕获模式。 3.松开SW1并立即按下SW2。 4.保存捕获的波形。 请求您澄清如何测量该RC电路的准确信号电压? RC电路.PNG8.0 KB 以上来自于谷歌翻译 以下为原文 Hi, I am using DSO-X 3034A series to work on a simple RC circuit to verify capacitor discharge voltage in 1msec through 680 ohm. Theoretically i am calculating using equation V=12*(exp(-0.01/(4.7uF*680))) which come out to be 8.77V but using DSO I am not able to verify it. Practically when I measured with DSO it is discharge to 5V. I have attached RC circuit and waveform captured. Below is the test procedure that I am following 1. Set trigger on falling edge and trigger level to 8V. 2. Connect CRO probe (10:1) across C1 and Press SW1 till cap charges to 12V. 3. Press single capture mode on DSO. 3. Release SW1 and immediately press SW2. 4. Save captured waveform. Request you to Please clarify how can I measure accurate signal voltage for this RC circuit? 附件
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1个回答
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你真的想测量什么?
RC时间常数? 如果是这样,你正在做的事情可能是示波器的最佳方法。 请注意,垂直分辨率仅为8位(256级),这对于示波器来说并不罕见,因为它们主要是视觉仪器而非绝对精度仪器。 但有时人们认为它们可以与高位数DMM互换(它们不是这个)(这就是为什么这个范围的3位DMM功能是一个附加选项)。 您还可以使用其他仪器(如LCR仪表或函数发生器)来表示时间或频率,以获得更高的准确度,但这取决于您在实验室中的现有情况。 以上来自于谷歌翻译 以下为原文 What is it you really want to measure? RC time constant? If so what you are doing is probably the best way with an oscilloscope. Be aware that the vertical resolution in only 8 bits (256 levels) which is not unusual for oscilloscopes as they are primarily visual instruments rather than absolute accuracy instruments. But sometimes people think they are interchangeable with high bit-count DMMs which they are not (this is why the 3-digit DMM feature of this scope is an add-on option). You could also use other instruments such as LCR meters or function generators to characterize in time or frequency to higher accuracy but it depends on what you have on-hand in your lab. |
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