Video Title: (R6a2-yateloond12sl-12d38mm Wmv)
Video Duration: 3:36
From: Martinm210
Category: Science and Technology
starting in on a much larger round of tests, this time with almost all new testing equipment that should be a big improvement over my previous work. mainly, my old anemometer made noise and it also seemed to interact and create odd results with some fans. i've switched that out to an extech hotwire anemometer which has no vane, i've also switched over to an american recording technologies a-weighted sound level meter which is much more matching of the human ear's perception of noise level. finally i've switched to a swiftech mcr120 for a wider and lower air pressure drop. in addition i've added back in the scythe meter for approximate rpm -50rpm or so, and using my old mastech meter for monitoring hz on the rpm wire for a more exact rpm hz x 30 rpm. anyhow, that's it, planning to do a bigger round this time, but in smaller 6-10 fans at a time. testing notes: -air flow: extech heavy duty hot wire, permanently fixed to outlet chamber 3.66" id port. good down to 40 fpm cfm is calculated later using port area. -noise level by american recording technology a-weighted meter good down to about 32dba. meter placed 6" away from fan as shown. previous testing shows results were very similar to 12" a weighting from zoom recorder. -chamber is 21" long 8" id heavy walled pvc, lined with egg crate to minimize chamber air flow noise. -flow spreader in chamber is made from 34" ea 4" x 1"id tubes -template face and outlet port is made from 3 4" 10ply plywood. radiator is a new ltbgt...lt bgt
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