The 7854 (and maybe other 7000 series scopes) draws air in through strategically placed perforations in the covers (top and sides but mostly bottom) and blows it all out the back. There are no filters. The fan is a propeller type.
Regards, Cliff Carrie
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From:
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Sent: Monday, August 19, 2019 8:58 PM
To:
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Subject: Re: [TekScopes] Fan direction on TEK485
All I have ever seen draw in at the back. The air passes through the
filter first before being delivered to the interior of the cabinet.
Here is a bit of fan/blower trivia: A propellor fan needs maximum power
when the air flow is impeded or blocked, a centrifugal requires minimum
power when the air flow is blocked. The motors on propellor fans are
usually cooled by the air flowing over them. A clogged filter not only
overloads the motor, it deprives the overworked motor of cooling. Keep
the filters clean and free flowing. Don't ignore the filter if it is
missing, high voltage attracts dust from unfiltered cooling air, which
can cause a flashover.
Bruce Gentry, KA2IVY
On 8/19/19 8:28 PM, Kevin Oconnor wrote:
Did the TEK factory have the fan suck air in or blow it out the back?
kevin
