[问答]

在开放/短路时有长期偏移延迟的任何缺点？

问答对人有帮助，内容完整，我也想知道答案 0 具有长偏移延迟的校准套件是否有任何缺点？我本周遇到了一个问题，因为85052B中的开放式偏置公（85052-60008）被损坏了。作为一个短期修复，在新的男性偏移开放到来之前，我通过结合男性 - 男性3.5毫米适配器（85052-60014）以及女性开口和短裤来决定男性标准。男性 - 男性适配器和女性标准的组合显然给了一个公连接器。我假设开路的偏移延迟是29.2 ps，短路是31.8 ps。这些是http://na.tm.agilent.com/pna/caldefs/PNA/85052B.htm上报告的值，尽管我在另一篇论坛帖子中收集了Brad，但这些值中存在一些小的舍入错误。无论如何，作为一个短期修复，我将这些延迟添加到适配器的延迟（94.75 ps），以提出一个新的校准套件，偏移延迟为：短+适配器= 94.75 + 31.8 = 126.55 ps开放+ 适配器= 94.75 + 29.2 = 123.95 ps这些值远远超过我所知道的任何商业校准套件。然后，我使用这些值，用“适配器+偏移短路”和“适配器+偏移打开”校准VNA。我没有修正适配器的丢失。令我惊讶的是，这似乎有效。即使在20 GHz时，开路和短路的测量相位也相差近180度。在20.00 GHz时，开口的相位为155度，短-22度，因此差值为177度，距离最佳180度并不太远，并且在允许的范围内。这让我想知道，使用偏移延迟的时间是否比任何时间长？我意识到损失会更高，但原则上可以通过修正的抵消损失值来纠正。我没有在航空公司检查任何这个，对于实际测量我只需要工作到1.3 GHz。但是男性 - 男性适配器，女性标准和一些基本算术的组合，我似乎能够得到看起来不错的校准。我预计长适配器的延迟会比短适配器慢，但我预计这种效果与即使最轻微的电缆运动产生的变化相比也会很小。 DaveEdited：drkirkby于2013年9月28日下午6:30 以上来自于谷歌翻译以下为原文 Is there any disadvantage in a cal kit having a long offset delay? I hit a problem this week, in that the open offset male (85052-60008) in my 85052B was damaged. As a short-term fix, before the new male offset open arrives, I decided to male standards by combining a male-male 3.5 mm adapter (85052-60014) along with female opens and shorts. The combination of a male-male adapter and a female standard, obviously givens one a male connector. I assumed the offset delays of the open was 29.2 ps and the short=31.8 ps. Those are the values reported at http://na.tm.agilent.com/pna/caldefs/PNA/85052B.htm although I gather from Brad in another forum post, there are some small rounding errors in those values. Anyway, as a short-term fix, I added those delays to the delay of the adapter (94.75 ps), to come up with a new cal kit, with offset delays of: short + adapter =94.75+31.8=126.55 ps open + adapter =94.75+29.2=123.95 ps Those values are far in excess of any commercial cal kit I'm aware of. I then calibrated the VNA with "adapter+offset short" and "adapter + offset open", using those values. I made no correction for loss of the adapter. Much to my surprise, this seemed to work. Even at 20 GHz, the measured phases of the open and short were close to 180 degrees apart. At 20.00 GHz, the open had a phase of 155 deg, and the short -22 deg, so the difference was 177 degrees, which is not too far from the optimal 180 degrees, and well within the permissible range. This got me wondering, is there any particular disadvantage in using offset delays much longer than necessary? I realize the loss will be higher, but one could in principle correct for that, with a revised value of offset loss. I've not checked any of this on an airline, and for the actual measurements I only needed to work to 1.3 GHz. But the combination of male-male adapter, female standards, and a bit of basic arithmetic, I seemed to be able to get a calibration that looked ok. I expect a long adapter would have a less stable delay than a short one, but I would have expected the effects of that to be small compared to the changes that result from even the slightest cable movement. Dave Edited by: drkirkby on Sep 28, 2013 6:30 PM 0
2018-12-28 15:53:30　　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 sonia87 该类别下有 16 个回答。邀请回答 ningee 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 daichuangs 该类别下有 14 个回答。邀请回答 derek88 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 bisong13 该类别下有 11 个回答。邀请回答 hu_wflllllllg21 该类别下有 11 个回答。邀请回答 fichesw 该类别下有 11 个回答。邀请回答举报李青相关推荐 • 开放最短路径优先协议ospf采用的路由算法是什么 1185 • 如何在两个或多个PWM脉冲之间放置延迟或偏移量呢？ 272 • 为什么短负荷不在史密斯圆图的短路点？ 2527 • 如何估计SerDes输入时序约束所需的偏移输入延迟？ 2468 • IC的长期稳定性：唯一不变的是变化本身 2588 • AD7760EDZ调试过程中发现AVDD1、VDRIVE、DVDD与GND脚用万用表测试时有短路现象是什么原因？ 856 • 如何用滑动载荷定义波导校准套件？ 1659 • 关于信号发生器的疑问，请求高手帮助~ 2341 • 如何控制时钟偏移? 5359 • AD7760EDZ核心板供电脚与GND脚有短路现象 1625 2个回答

答案对人有帮助，有参考价值 0 Dave，在任何机械校准装置上具有长偏移延迟的主要缺点是对温度变化的敏感性。如果准确计算损耗和延迟，则在整个工作频率范围内开路和短路相距约180度。从制造和机械测量的角度来看，更长的偏移更难以制造和精确测量。肯以上来自于谷歌翻译以下为原文 Dave, The main disadvantage in having long offset delays on any mechanical calibration device is sensitivity to temperature changes. If the loss and delay are accounted for accurately and the open and short are approximately 180 degrees apart over the entire operating frequency range. From a manufacturing and mechanical measurement perspective, longer offsets are more difficult to make and measure accurately. Ken

2018-12-28 16:05:39 评论举报黎菁菁

答案对人有帮助，有参考价值 0 60user22 发表于 2018-12-28 15:48 Dave，在任何机械校准装置上具有长偏移延迟的主要缺点是对温度变化的敏感性。如果准确计算损耗和延迟，则在整个工作频率范围内开路和短路相距约180度。从制造和机械测量的角度来看，更长的偏移更难以制造和精确测量。 > {quote：title = kenwong写道：} {quote}> Dave，>>在任何机械校准设备上具有长偏移延迟的主要缺点是对温度变化的敏感性。如果准确计算损耗和延迟，则在整个工作频率范围内开路和短路相距约180度。从制造和机械测量的角度来看，更长的偏移更难以制造和精确测量。 >>肯谢谢肯。如果问题再次出现，我会为未来考虑到这一点。它似乎是一个紧急修复工作。幸运的是，我的家/办公室，在我的车库的房间里，是空调，所以温度变化也不算太差。我现在有一个Agilent 85052-60006（公短），所以我不再需要适配器来达到男性标准。我仍然缺少F-F适配器85052-60012，但我现在可以没有它。戴夫以上来自于谷歌翻译以下为原文 > {quote:title=kenwong wrote:}{quote} > Dave, > > The main disadvantage in having long offset delays on any mechanical calibration device is sensitivity to temperature changes. If the loss and delay are accounted for accurately and the open and short are approximately 180 degrees apart over the entire operating frequency range. From a manufacturing and mechanical measurement perspective, longer offsets are more difficult to make and measure accurately. > > Ken Thank you Ken. I'll bear that in mind for the future, if ever the problem arose again. It seemed to work as an emergency fix. Luckily my home/office, which is in a room attached to my garage, is air conditioned, so temperature changes are not too bad. I've now got a Agilent 85052-60006 (male short) so I no longer need the adapter to get have a male standard. I'm still missing the F-F adapter 85052-60012, but I can live without that for now. Dave

2018-12-28 16:11:56 评论举报李青