是否有关于各种3000X和4000X示波器产生的声学噪声的规格或信息？

我很好奇是否有关于各种3000X和4000X示波器产生的声学噪声的规格或信息？
我打算买一个在非常安静的房间里使用的示波器。
为了更熟悉3000X，我最近租了一台DSO-X 3014A。
到目前为止，我喜欢示波器的功能，但它非常嘈杂！
我通过插槽捅镊子暂时使风扇停转，结果发现大部分噪音是一种可怕的嘶嘶声/嘶嘶声，听起来就像开关电源正在消亡。
在Dave的eevblog论坛上，有人向我指出了记录此问题的服务说明。
我会尝试附加文件。
明天我会打电话给租赁公司，看看他们是否可以换货。
所以我留下了一个非常复杂的意见......我喜欢3000X的速度和性能，但这个****的东西非常嘈杂。
即使没有电源问题，风扇也非常大，非常安静。
这对我来说真的是一个破坏者。
也许4000X有一个更安静的风扇？
希望它也没有可听见的开关电源噪声？
我查看了数据表，但没有看到任何关于声学噪声的规格。
有没有这样的信息？
我想更换风扇会使保修失效？
我已经在其他设备上完成了这项工作，比如我办公桌上的廉价Rigol示波器，但只需800美元，与10,000美元+设备的保修失效相比，几乎没有风险......



     以下为原文

  I'm curious if there are any specs or info on the acoustic noise produced by the various 3000X and 4000X scopes?

I intend to buy a scope for use in a very quiet room.  To become more familiar with the 3000X, I recently rented a DSO-X 3014A.  So far, I love the scope's features, but it's terribly noisy!  I temporarily stalled the fan by poking tweezers through the slot, and it turns out much of the noise is a terrible hissing/sizzling that sounds like a switching power supply is dying.

On Dave's eevblog forum, someone pointed me to a service note documenting this problem.  I'll try to attach the file.  Tomorrow I'll call the rental company to see if they can exchange it.

So I'm left with a really mixed opinion... I love the 3000X speed and performance, but this **** thing is terribly noisy.  Even without the power supply problem, the fan is far too loud for an extremely quiet room.  It's really a deal breaker for me.

Perhaps the 4000X has a quieter fan?  Hopefully it's also free of audible switching power supply noise?  I looked over the datasheet but didn't see any specs about acoustic noise.  Is there any such info?

I suppose replacing the fan would void the warranty?  I've done that on other equipment, like a cheap Rigol scope that's been on my desk, but at only $800 it's hardly the risk compared to voiding the warranty on a $10K+ piece of equipment.....   

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