morse@leadsv.UUCP (Terry Morse) (11/16/85)
This is a comparison of two cooling fan/surge suppressors for the MAC. Fanny Mac MacBCool ________________________________________________________________________ Airflow 24 CFM 17/20 CFM Noise level 30 db @ 1 meter 2/13 db @ 3 ft Transient protection MOV MOV Clipping Voltage ? 200 V Max. Clamping voltage 395 V @ 50 A^(-6) ? Peak Current 4500 A @ 8/20 sec^(-6) 6500 A @ 20 sec^(-6) max Peak Energy 45 J @ 10/1000 A^(-6) 70 J # of outlets 1 3 EMI Filter no yes Sugg. Retail $125 $169 Company Beck-Tech MPH Electronics 41 Tunnel Rd. 2660 Loma Ave. Berkeley, CA South El Monte, CA These figures have been taken directly from their literature. MacBCool covers the entire top of the Mac, whereas Fanny Mac slips into the Mac's handle recess. Another thing to ponder: (from Office Computing, June 3, 1985) "If you decide to buy a [surge] protector, it's best to look for units that can handle: (1) Power drops. The unit should be able ... to shut off the power if the voltage drops below 20% of normal. (2) Power surges ... (3) Power filtering. The unit should be able to filter out noise from 150 kilihertz to 30 megahertz, and to -50db." Why are power drops so dangerous to circuitry? Neither MacBCool nor Fanny Mac have any protection for power drops. Could someone explain if it is something we need to be worried about? Note: The above referenced article recommended either the Powersafe or Ultramax surge supressors ($90 and $80, respectively). The article was written for the Stanford Workstation Support Center. -- Terry Morse (408)743-1487 { ihnp4!amdcad!cae780 } | { allegra!sun!sunncal } !leadsv!morse