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Fan Testing Part 2 (Radiator Tests & Videos) - Page 2

post #11 of 34
Quote:
Originally Posted by Martinm210 View Post
Thanks!

I'd recommend the videos over the noise numbers. The sound level meter I have and used for these tests was a cheapy (Under $100). To use a method where you measure sound level from several feet away would require that you purchase one of the high end lab grade meters that have a range down well below 30dB. Those can cost as much as $200-300 and way outside my budget.

My meter will only read down to somewhere around 39dB, so the only way I was going to get a number and a large range of useable numbers to plot and look at, I had to measure point blank range. I also added a constant background noise to keep the ambient level fixed. It's what I had to do for the tool I had to use.

But I'd be happy to run some more tests if you want to donate me one of those high grade sound level meters..

If there's one thing I've learned in this excercise, measuring sound level is very tricky. To do it right you would really need to build a sound room, then you need a sound meter that costs a fortune, then you're only measuring noise level and you're still missing the whole sound quality piece. Then you realize this was supposed to be for fun!...
ooh i see,

i will go out and buy a lottery then, if i win you will get yourself a highest qualty sound meter i can find

until then i guess its time to look for decent one on Ebay
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post #12 of 34
one more thing, arent the noise rating on the fans are based on fan noise plus the ambient noise?

so for the testing, you would measured the ambient noise first then measure the fan noise from the distance and subtract the ambient noise from it.

I can hardly believe that a fan can have 19 dB absoulute noise level which is inaudible
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post #13 of 34
Thread Starter 
Quote:
Originally Posted by gbyss View Post
one more thing, arent the noise rating on the fans are based on fan noise plus the ambient noise?

so for the testing, you would measured the ambient noise first then measure the fan noise from the distance and subtract the ambient noise from it.

I can hardly believe that a fan can have 19 dB absoulute noise level which is inaudible
Yeah there is some different methods out there for testing fans, most of which consist of the fan unmounted in free open air, but this doesn't at all represent the noise you get from the fans vibration against a radiator. There's also some that test differently than others and why you really can't trust fan noise specs because there isn't an agreed upon convention that everyone follows.

I chose the simple route and kept ambient noise as constant as possible and simply recorded the actual dB. Because my measurement was so close to the fan I found the couple of dB in ambient noise fluctuation or measurement error had very little affect on the total dB that the meter read.

Measuring noise is a PITA, the biggest issue is finding silence. You have no idea how frustrated I got trying to find a place and time to keep things silent for the video recordings. It really brings you perspective just how noisy the world is, especially with young kids in the house. I was just glad to get it done.

Now go buy that lottery ticket...I need a better meter..
    
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post #14 of 34
Quote:
Originally Posted by Martinm210 View Post

Now go buy that lottery ticket...I need a better meter..
here are the tickets for your new meter



Lets all cross the fingers for Martin's new meter and for more accurate testings :
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post #15 of 34
Thread Starter 
Quote:
Originally Posted by gbyss View Post
here are the tickets for your new meter



Lets all cross the fingers for Martin's new meter and for more accurate testings :
LOL!!! You actually did...that's awesome. I'll cross my fingers for that million bucks too so you can buy a new house while your at it..
    
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post #16 of 34
Thread Starter 
Alright, I got the rest of the fans done, all the videos are linked in the OP.

This test is DONE!!

Cheers
Martin
    
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post #17 of 34
Thanks for all the hard work and time you dedicate to these tests Martin !
post #18 of 34
I thought I had already put this one up in the stickies, I just went to look at it and it wasn't there....

That's a lot of work, it will give the guys a real good idea of the tone of the fans.

Good stuff! Thanks for all the work Martin, its always appreciated.
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post #19 of 34
Yes thanks a lot! This opened my eyes to some nice fans out there that I had never heard of like the Nanoxia. If you ever get a chance to test out the Noctua NF-S12 I'd be interested to see how it stacks up.

Also I am very interested in a similar testing of 140mm fans out there. I don't have the wherewithal to do it myself but I may be able to contribute.

+ rep
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post #20 of 34
hey martin

would you willing to test Nidec Beta V TA450DC fans?

Im willing to send you 2 fans

i put 2 drops of 5w-30 engine oil on the bearing and the other one is bone stock

it would be great if it could be compared to the other fans

pm me if interested
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