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打算购买一个TDR设备,业内有哪些普遍使用的设备。

PCB阻抗、矢量网络分析仪、TDR访问量:1时间:2022-07-15

我们目前打算购买一个TDR设备(或可能是2个)来测量PCB上各种线迹的阻抗,但我们刚刚开始。您能推荐一些好的设备或目前行业内普遍使用的设备吗?我必须关注哪些参数(我知道上升时间是最关键的参数;但还有哪些参数可以描述这样一个系统)?

谢谢你的信息。我们(事实上)是 "PCB行业人员",但我们打算过渡到高速设计(Gbps范围),由于我讨厌依赖工厂的人告诉我他们的测量结果,我想自己进行这些测量(只是为了确保设计事实上是正确的)。一如既往:测量总比猜测好。

我们也确实有很多客户的PCB要进厂(我们也是一家装配公司),所以我们希望在收货的过程中也进行这种测试(只要有可能)- - 因此,成本不是唯一的问题,还有可用性和灵活性。因此,我对可供选择的方案感兴趣,以获得大格局的建议。谢谢 :)

你只是做pcb,想测量1Mhz时的阻抗吗?如果是这样,我想有一些比较便宜的盒子可以用,但我从来没有用过。

如果你在做高速的工程工作,sparq是非常棒的。它是一个TDR和一个S参数提取器,就像一个网络分析仪,但更容易使用,而且是为pcb人员建造的。

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我也用过带TDR选项的TEK采样范围。

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我主要看的是测试信号的边缘速度,速度越快,你会看到更多的细节。然后是软件和它能为你提取的东西。哦,探测这些工具都是SMA输入和输出,这意味着你的测试卡上应该有SMA接头。

如果没有,请看一下gigaprobes,它是用于上述类型的TDR(或示波器)的极高速探头。我曾用它们来获得主板的S参数和阻抗测量,从英特尔处理器连接器到pci-e针脚。

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考虑一个带有时域选项的矢量网络分析仪。

频域是新的时域,至少根据安捷伦/Keysight的说法。它可以绘制眼图,测量长度,阻抗,失配...

但说真的,对于测量迹线阻抗,网络分析仪是一个不错的仪器选择。

但以上这些东西都不便宜!

原文:

TDR Device parameters

We are currently intending to purchase a TDR device (or maybe 2) to measure the impedances of various traces on PCBs but we are just at the beginning. Can you recommend some good devices or devices which are commonly used in the industry at the moment? What are the parameters I have to look at (I know that the rise time is the most critical one; but what else characterizes such a system)?

Thanks for your info. We (in fact) are "PCB guys" but we intend to transition to high speed designs (Gbps range) and since I hate relying on the fab guys telling me what they measured, I would like to perform these measurements by myself (just to be sure the design is in fact correct). As always: measuring is better than just guessing.

We also do have quite a lot of customer PCBs going in (we're an assembly company as well) so we would like to do this testing also in the process of receiving goods (whenever possible) - therefore the cost is not the only issue, but also usability and flexibility. Therefore I was interested in the options available to get the big picture. Thanks :)

Are you just making pcbs and want to measure the impedance at 1Mhz? If so I think there are some cheaper boxes that will work but I've never used them.

If you're doing high speed engineering work the sparq is awesome. It's a TDR and a s-param extractor, like a network analyzer but easier to use and built for pcb guys.

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I've also used the tek sampling scope with TDR option.

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The main thing I'd look for would be edge speed of the test signal, the faster it is the more detail you're going to see. After that software and what it can extract for you. Oh and probing both these tools are SMA input and output which means your test card should have SMA connectors on it.

If it doesn't take a look at gigaprobes extremely highspeed probes for use with the above kind of TDRs (or scopes). I've used them to get s-param and impedance measurements for motherboards from the intel processor connector down the pci-e pins.

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Consider a Vector Network Analyser with the time domain option.

Frequency domain is the new Time Domain, at least according to Agilent / Keysight. It plots eye diagrams, measures length, impedance, mismatch...

But seriously, for measuring trace impedance, a network analyser is a good choice of instrument.

I found the Lecroy and giga guys very knowledgable and willing to help, but none of the above is cheap!

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