SA消息错误及SA被过度的Vdc损坏问题

再次，谢谢你的回复。
我再看看我的SA 893E，为了其他读者的利益，我可以这么说。
我使用启动频率按钮（9KHz）调到单元的最低频率，但我没有看到LO（尽管如果调到其他频率并且不断增加量程，你可能会看到LO）。
由于我没有看到9 KHz的LO，我可以说在运行其他一些快速测试之后，该设备在此设置下可视运行正常。
如果有人使用相同的SA并输入9 KHz的起始频率并看到LO信号，则表明该单元可能已损坏。
我最后的陈述不应被视为一个完整的测试，看看我的SA是否正常工作。
如果您看到LO为9 KHz，我只是提供“事实”，仅指示“可能情况”。
Tabbot，我再次感谢你的回复。
我之所以提出寻求目视检查的问题，是因为，像大多数技术人员一样，我对拆开一个似乎正常工作的单位持怀疑态度。
盖子关闭时会发生任何事情。
如果在盖子关闭时（但你当时不知道哪个部件）并且当你把盖子放回到你身上时，如果一个微小的静电火花会损坏一个部件，你就会得到下沉的感觉
发现单位的真实（非潜在）问题。
一个数千美元的单位现在已经损坏，更糟糕的是，损坏可能是不必要的。
你现在已经引起了一个问题，而不是解决一个潜在的问题，现在你可能会遇到两个问题，而不是一个或者没有问题。
在瞬间吹了数千美元并且没有任何快速补救措施可用于维修设备之后，没有任何事情像你在胃里得到的下沉感觉（没有多少人有另一个频率分析仪浮动额定相同的BW）。
感谢您的回复，我希望您能理解为什么我有时会提出这类问题。
编辑：SOLT_guy于2013年3月6日上午6:46编辑：SOLT_guy于2013年3月6日上午6:50编辑：SOLT_guy于2013年3月6日上午6:52编辑：SOLT_guy于2013年3月6日6:54
上午



以下为原文

Again, thank you for your reply.

I took another look at my SA 893E and for the benefit of other readers I can say this.

I tuned to the lowest frequency of the unit using the start frequency button (9KHz) and I did not see the LO (although you will probably see the LO if you tune to other frequencies and continuously increase the span). Since I did not see the LO at 9 KHz, I can say the unit visually appears to be operating correctly at this setting after running some other quick tests. If someone is using the same SA and inputs a 9 KHz start frequency and sees the LO signal, it would indicate to me that the unit may possibly be damaged. My last statement is not to be considered a complete test to see if my SA is working correctly. I am just offering a "fact", an indicator only, of a "probable condition" if you are seeing the LO at 9 KHz.

Tabbot, I would like to thank you again for your replies. The reason why I asked the questions seeking visual inspection is because, like most techs, I am a leery of taking apart a unit that appears to be working correctly. Anything can happen with the cover off. There is nothing like the sinking feeling you will get if a tiny spark of static electricity happens to damage a component while the cover is off (but you don't know which component at the time) and when you put the cover back on you now discover a real (not potential) problem with the unit. A many thousand dollar unit is now damaged and, worse yet, the damage may have been unnecessarily caused. Instead of fixing a potential problem, you have now caused one, and now you may have two problems to look at, instead of one or none.

There is nothing like the sinking feeling you get in your stomach after blowing many thousands of dollars in an instant and not having any quick remedy available to repair the unit (not many people people have another spectrum analyzers floating rated for the same BW).

Thanks for your reply and I hope you can understand why I sometimes pose questions of this type.

Edited by: SOLT_guy on Mar 6, 2013 6:46 AM

Edited by: SOLT_guy on Mar 6, 2013 6:50 AM

Edited by: SOLT_guy on Mar 6, 2013 6:52 AM

Edited by: SOLT_guy on Mar 6, 2013 6:54 AM

亲爱的Tabbot;
我很久很久以前就开始了一篇关于在使用另一台8593E频谱分析仪时无法看到低频信号的帖子。
一个人的用户名是“DHamilton，他之所以提出我无法看到低频信号的原因是因为8593E前端可能会损坏。我搜索了这篇文章，但直到今天才找到它。我
最后发现DHamilton的帖子写道：“859xE系列的LO应该比满量程低11到15分贝。
如果应用已知的-10 dBm信号@ 10 KHz并且频谱分析仪设置为-10 dBm的RF电平且RF输入衰减器设置为0 dB，则CW设置为10 KHz的中心和25 KHz的跨度。
LO应比RF载波低约11 - 15 dB。
如果它接近与RF信号相同或更高的级别，则说明硬件有缺陷会导致此故障。
该单位需要修理。“我希望所有其他感兴趣的读者发现这篇文章”有用“。我希望有一个”吹“前端的人可以告诉我们他的经历以及他是如何通过目视检查发现问题的。这总是很好的
知道一个非常快速的方法，以确定你是否吹了前端。再次，感谢您的反馈。非常感谢。



以下为原文

Dear Tabbot;

I started a post a long, long, time ago about not being able to see a low frequency signal when I was using another 8593E spectrum analyzer.

A person, whose username is, "DHamilton, had suggested that the reason why I could not see the low frequency signal was because the 8593E front end may be damaged.

I searched for this post but was not able to find it until today. I finally found the post

DHamilton wrote this:

"The 859xE series should have the LO about 11 to 15 dB below full scale. If you apply a known -10 dBm signal @ 10 KHz and with the spectrum analyzer set to a RF level of -10 dBm and RF input attenuator set to 0 dB, CW set to a center of 10 KHz and a span of 25 KHz. The LO should be approximately 11 - 15 dB lower than your RF carrier. If it is close the same level or higher than your RF signal, you have defective hardware which is causing this failure. The unit requires repair."

I hope all other interested readers find this post "helpful".

I hope someone who has "blown" a front end can tell us of his experience and how he detected the problem by visual inspection. It is always nice to know a really fast method to determine if you blew the front end.

Again, thanks for your feedback. It was appreciated.