83650L输出级别故障

嗨，我的83650L合成器有问题。
它似乎可以达到20.000 GHz，但从20.001 GHz起，输出功率不均匀并且显着下降。
在20.001 GHz时，最大输出功率约为-14 dBm，在40 GHz时降至-100 dBm以下。
内置的自测试表明一切正常，但显然情况并非如此。
我可以访问故障排除指南和8360扫地机系列的服务指南，但我很感激任何好的想法从哪里开始寻找这个失败。
看完程序框图后我的初步猜测是它可能是RF DECK上的放大器/倍增器模块之一，但这只是一个猜测。
我还没有测量任何东西。
我希望非常突然的功率降到正好20.000 GHz以上可能会暗示一些修复8360扫地机的人会遇到什么问题。非常感谢任何helpPeter



     以下为原文

  Hi,

I have a problem with my 83650L synth. It seems to be ok up to 20.000 GHz but from 20.001 GHz and up the output power is unleveled and drops down significantly. At 20.001 GHz max output power is about -14 dBm and it goes down to below -100 dBm at 40GHz. The built-in selftest says that everything is working properly, but obviously this is not the case. I have access to the trouble shooting guide and the service guide for the 8360 sweeper series but i would appreciate any good ideas where to start looking for this failure. My initial guess after having a look at the block diagram is that it could be one of the amp/multiplier modules on the RF DECK, but this is so far just a guess. I have not measured anything yet. I hope the very abrupt power drop above exactly 20.000 GHz could be a hint what the problem might be for some person experienced with repairing 8360 sweepers.

Many thanks in advance for any help

Peter