Experiencing increased channel noise levels on PXIe4497 with 1071 fan on HIGH

I am using a PXIe-4497 to collect microphone data and when I switch the PXI chassis 1071e fan to HIGH setting, the noise level increases. The chassis is outside of an isolated test chamber, so the noise isn't occuring acoustically. Please see the FFT plot below of fan on AUTO (white trace) and fan on HIGH (red trace). Has anyone had this issue?
Attachments:
Background Measurement with PXI1071 fan on AUTO and HIGH.PNG ‏89 KB

There was some noise getting the pass through into the chamber. We added more sound insulation to block it out. Here's what it looks like with the added insulation (FAn on HIGH, white trace is with added insulation):
But as you can see there are ~256Hz harmonics. The data below is for MIC Y which is last channel the PXI-4492 (first module). The difference between AUTO and HIGH settings is now:
Here is MIC Z which is first channel input on the next module PXI-4497:
Auto and HIGH fan settings are close to being similar for MIC Z> Here are MICs X (white), Y(red), and Z (green) plotted together with fan on HIGH...X and Y are on PXI-4492 (last two inputs) and Z is on PXI-4497:
As you can see MIC Z doesn't have the 256Hz harmonics. We swapped the Z with the Y channels to see if it was MIC or channel related. Below is MIC Z in last input channel of PXI-4492 (where MIC Y was originally):
The noise follows the input channel, not the MIC. Here is the other side of the swap...MIC Y in first input channel of PXI-4497:
No significant change now between Auto and HIGH fan settings.
This seems to be input module related....
What now?

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X1900 XT compared with, say, the standard GeForce
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Result from speedtest .net from 12/4 with new bt hub
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Hello loghmani,
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Hi all,
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How is your experience with the 5000 series in standby mode?
Could it be that something's wrong and our 5100 needs to enter 'deeper' standby? (We've set standby at 30 minute interval (shortest))
- Is it possible to add a 2nd 500 page papertray?
Our supplier has provided a second one, but it lacks the electrical pass-through connections. In other words to me it is a
'bottom' tray... Do these kind of papertrays exist at all, or is this only possible with 250 page trays?
Thanks for your help!
Erwin

Great opening post Carsten!
The latest bios:
http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-71252 (BIOS 66)
The FSB can be reduced from 133MHz to 100MHz using SetFSB, this also reduces the heat:
http://www13.plala.or.jp/setfsb/
clockgen = SLG8SP513V
If you add a shortcut to the startup folder the program will start at startup. Under properties you can change the target to:
"C:\Program Files\SetFSB\setfsb.exe" -s100 -b1 -cg[SLG8SP513V] -w20
So it starts with a FSB of 100Mhz, in the background, with the right clock generator, after 20 seconds.
Message Edited by quazar on 04-25-2009 05:07 AM

SG300-28P noise level... (fan control)

Hello,
May be somebody can help me. In official information for SG300-28p noise level is 40.6 dB, but in fact its too noisy. Is it possible to change speed of fans? I use only 8 PoE ports.
Thanks in advance,
Andrey

Hi Andrey,
I placed a sound meter within 6 inches of the Right hand side of my SG300-28P and found a average dB level of 47
I rested a sound meter on top of my SG300-28P and found a average dB level of 59-60dB .
I used my motorola atria phone in conjunction with a Sound Meter ver 1.4.3 dB meter app to perform the measurements.
My measurements were not done according to any standards based approach for measurements of sound level of machines.
Conversation in restaurant, office, background music, Air conditioning unit at 100 ft
60
Half as loud as 70 dB. Fairly quiet
Quiet suburb, conversation at home. Large electrical transformers at 100 ft
50
One-fourth as loud as 70 dB.
Library, bird calls (44 dB); lowest limit of urban ambient sound
40
One-eighth as loud as 70 dB.
reference :http://www.industrialnoisecontrol.com/comparative-noise-examples.htm
My unit is no more than 3 feet from my left ear, and I do not find the sound distracting..but noise/sound is subjective.
The fans on the SG300-28P are not adjustable.
regards Dave

Experiencing increased channel noise levels on PXIe4497 with 1071 fan on HIGH

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