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
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