[问答]

E4407B的参考电平怎么设置

问答对人有帮助，内容完整，我也想知道答案 0 您好我正在尝试测量具有多个谐波的信号，并对设置参考电平/衰减有疑问。我正在设置频率跨度，以便我一次只能看到一个谐波，并想知道您是否根据特定谐波的功率设置参考电平/衰减，还是需要将其设置为最高功率电平整个信号，即使只有一个谐波在频率范围内？换句话说，我的信号包含：1 GHz @ 0 dBm 2 GHz @ -10 dBm 3 GHz @ -20 dBm我将频率范围设置为一次仅显示其中一个信号。我应该将参考电平设置为0 dBm，还是可以在测量三次谐波时将其设置为-20 dBm？我问，因为当我将衰减水平改为5 dB以外的任何值时，我得到的三次谐波功率测量结果非常不同。编辑：sgpars于2014年3月24日下午3:54 以上来自于谷歌翻译以下为原文 Hello I am trying to measure a signal with multiple hARMonics and have a question about setting the reference level/attenuation. I am setting the frequency span so that I only see one harmonic at a time and want to know if you set the reference level/attenuation based on the power of that particular harmonic or do you need to set it to the highest power level for the entire signal, even though only one of the harmonics is within the frequency span? In other words, I have a signal that contains: 1 GHz @ 0 dBm 2 GHz @ -10 dBm 3 GHz @ -20 dBm I set the frequency span to only show one of these signals at a time. Should I set the reference level to 0 dBm or is it ok to set it at -20 dBm when measuring the 3rd harmonic? I ask because when I change the attenuation level to anything other than 5 dB I get very different power measurements for the 3rd harmonic. Edited by: sgpars on Mar 24, 2014 3:54 PM 0
2019-1-3 15:30:41　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × kingnet_52040 该类别下有 195 个回答。邀请回答 60user7 该类别下有 81 个回答。邀请回答蓝色冰汐该类别下有 45 个回答。邀请回答醉狼工作室该类别下有 41 个回答。邀请回答 ianwhoani 该类别下有 30 个回答。邀请回答 dkhwakd 该类别下有 25 个回答。邀请回答 aaabbb567 该类别下有 23 个回答。邀请回答 e08506806 该类别下有 20 个回答。邀请回答 szzjfyp 该类别下有 18 个回答。邀请回答 ningee 该类别下有 16 个回答。邀请回答 sonia87 该类别下有 16 个回答。邀请回答 zouqinxiang 该类别下有 15 个回答。邀请回答 xj5548 该类别下有 15 个回答。邀请回答 derek88 该类别下有 14 个回答。邀请回答 daichuangs 该类别下有 14 个回答。邀请回答 hzmbs2016 该类别下有 12 个回答。邀请回答 JST2006 该类别下有 12 个回答。邀请回答 fichesw 该类别下有 11 个回答。邀请回答 www037 该类别下有 11 个回答。邀请回答 ToGoodSoft 该类别下有 11 个回答。邀请回答举报冯敏敏相关推荐 • E4407B与82357B：签证错误超时 3633 • 如何在SA E4407B上升级选件230 687 • E4407B固件升级怎么创建映像磁盘 1116 • 能提供ESA E4407B的示例代码吗 914 • E4407B频谱分析仪和E7405A EMC分析仪之间的差异？ 1851 • E4407B带有AYZ和外部混合器 1068 • B72 E4404B和E4407B之间的选项转换 1125 • E4407B响应缓慢 1470 • vrf Agilent E4407B频谱分析仪-屏幕格式 1204 • ESA-L E4408B如何增加401点？ 1133 2个回答

答案对人有帮助，有参考价值 0 Sgpars，在测量谐波时，有许多因素会影响测量。具体而言，发生器的输出信号电平与输入混频器电平有关。在较低的频率（-50 dBc，然后您将使用较窄的跨度技术来减少B / W滤波器，从而降低噪声基底的性能。以上来自于谷歌翻译以下为原文 Sgpars, When measuring harmonics there are many factors that can affect measurement. Specifically the output signal level of the generator in relationship to the input mixer level. On lower frequencies( -50 dBc, then you would use your technique of narrower spans to reduce the B/W filter, in which reduces your noise floor performance. Dave

2019-1-3 15:46:23 评论举报张英

答案对人有帮助，有参考价值 0 嗨 - 即使您将分析仪范围设置为仅查看1 GHz的基本信号，分析仪RF输入端的所有信号都将进入第一个混频器。当您查看三次谐波功率电平时，您对输入衰减器的说法发生了变化，这让我想到了安捷伦科技应用笔记150中概述的输入衰减器测试，其中指出我们可以使用简单的测试来确定显示的失真分量是真输入信号还是内部生成的信号。更改输入衰减器。如果失真分量的显示值保持不变，则分量是输入信号的一部分。如果显示的值发生变化，则失真分量在内部生成，或者是外部和内部生成信号的总和。我们继续更换衰减器，直到显示的失真没有改变，然后完成测量。此外，值得注意的是参考电平和输入衰减之间的自动耦合。当您更改其中一个参数时，请观察其他参数的耦合。输入衰减器控制将在第一混频器处出现的功率量。问候 - 以上来自于谷歌翻译以下为原文 Hi - Even though you have the analyzer span set to only view the fundamental signal at 1 GHz, all signals present at the analyzer’s RF input are going to the first mixer. Your statement about the input attenuator changes when viewing the 3rd harmonic power level made me think of the input attenuator test outlined in Agilent Technologies application note 150 where it states we can use a simple test to determine whether displayed distortion components are true input signals or internally generated signals. Change the input attenuator. If the displayed value of the distortion components remains the same, the components are part of the input signal. If the displayed value changes, the distortion components are generated internally or are the sum of external and internally generated signals. We continue changing the attenuator until the displayed distortion does not change and then complete the measurement. Also, worth noting is the auto coupling between the reference level and the input attenuation. As you change one of the parameters watch the coupling of the other parameter. The input attenuator is controlling the amount of power that is going to be present at the first mixer. Regards -

2019-1-3 16:04:23 评论举报李欢