M8190A上所需信号周围的无用信号

嗨，M8190A上的安捷伦大师，我只买了2个M8910A（产品版本2）来取代原版1单元。
我试图从M8190A生成多个音调信号。
但是我总是通过freq在我想要的信号周围得到不需要的多个信号产物。
偏移20.8KHz（312,000个样本长度），或2.08KHz，3,120,000个样本长度。
即使我将所有“1”加载到通道1并且将“0”加载到通道2，我仍然遇到同样的问题。
有时它没有出现，信号很干净。
但大部分时间都发生在我的两个单位上。
我的版本1单元没有出现此问题。
我已经想到并检查了ref信号，从内部采样信号（从“采样时钟输出”端口始终有+ / 1 270Hz信号）并重启PC和M8190A（和驱动程序）多次，但是甚至找不到
解决方法！
很沮丧!!
仅供参考，我使用C＃生成DAC值并使用IVI驱动程序加载到设备。
但就像我说的，即使加载“1”和“0”也会导致同样的问题。
我几乎得出的结论是硬件有问题。
您的及时帮助真的很感激!!!
射线



     以下为原文

  Hi, Agilent guru on M8190A,
I just got 2 of M8910As (product version 2) to replace original version 1 unit. I was trying to generate multiple tone signals from M8190As. But I always got unwanted multiple products of signals around my desired signals with freq. offset 20.8KHz (for 312,000 sample length), or 2.08KHz for 3,120,000 sample length.  Even if I loaded all "1" to channel 1 and "0" to channel 2, I still got the same problem. Sometimes it didn't show up and the signals were very clean. But most of time it happened, on both of my units.  

I didn't get this problem with my version 1 unit.  

I have thought of and checked ref signal, sampling signals from internal (which always has +/1 270Hz signals around from "Sample Clock out" port) and rebooted PC and M8190A (and driver) many times, but couldn't find even a workaround!!  Very frustrated!!   

FYI, I am using C# to generate the DAC values and load to the unit with IVI driver.  But like I said, even loading "1" and "0" will cause the same problem. I am almost coming to the conclusion that the hardware has the problem.

Your timely help is truly appreciated!!!

Ray