Hi Jim:
> My understanding is that the main 2 effects of increased altitude on
> electronics are reduced effectiveness of forced-air and convection cooling
> methods and reduced dielectric strength of air-gaps (clearances).
I concur.
> I believe the effects are linear with altitu
22, 2003 4:34 PM
To: jim.eich...@xantrex.com
Cc: emc-p...@majordomo.ieee.org
Subject: Re: Altitude specifications
Hi Jim:
> My understanding is that the main 2 effects of increased altitude on
> electronics are reduced effectiveness of forced-air and convection
cooling
> me
Jim,
>From a standards standpoint, altitude adjustments for dielectric values and
creepage and clearance distances are outlined in IEC 61010-1:1993, clauses
D.7.4 and D.9. These requirements probably come from IEC 60664-1 for
Insulation Coordination in low voltage equipment, Annex A. The table
56 AM
To: Jim Eichner; 'EMC-PSTC - forum'
Subject: Re: Altitude specifications
The Paschen curve that describes air dielectric breakdown vs. pressure is
not linear. I think you can find it in the Reference Handbook for Radio
Engineers.
> From: Jim Eichner
> Reply-To: Jim Eichner
The Paschen curve that describes air dielectric breakdown vs. pressure is
not linear. I think you can find it in the Reference Handbook for Radio
Engineers.
> From: Jim Eichner
> Reply-To: Jim Eichner
> Date: Thu, 22 May 2003 10:47:36 -0700
> To: "'EMC-PSTC - forum'"
> Subject: Altitude speci
According to DHL they only use pressurised holds.
> -Original Message-
> From: Ing. Gert Gremmen [SMTP:cet...@cetest.nl]
> Sent: Thursday, June 04, 1998 6:42 PM
> To: James, Chris; rbus...@es.com; emc-p...@ieee.org
> Subject: RE: Altitude
>
> I am not in the
Bike tires are a different story. All bike tires I've ever met can handle
14 psi above the rated pressure easily. No trouble are introduced by lower
ambient pressure, unless the tire is already overinflated. Often times
there are problems with tires that have latent effects, not to be confused
w
emc-p...@ieee.org
Subject:RE: Altitude
Can't answer for all components but of interest we had problems shipping
some types of MO discs (discs not drives) in even semi pressurised hold
conditions, where they would crack due to internal pressures within the
disc structure.
Is it heated? If no
Can't answer for all components but of interest we had problems shipping
some types of MO discs (discs not drives) in even semi pressurised hold
conditions, where they would crack due to internal pressures within the
disc structure.
Is it heated? If not it will be -50C or less also.
It would seem
Doesn't all this gassing stuff happen every time a chip gets hot, the cools
off? What's different?
Mike
At 04:04 PM 6/3/98 -0700, Douglas Mckean wrote:
>Well,
>
>Just for my two cents, 40,000 ft equates to roughly 1/5 the pressure at
>sea level or almost 3 lbs/in^2 absolute compared against 1
Well,
Just for my two cents, 40,000 ft equates to roughly 1/5 the pressure at
sea level or almost 3 lbs/in^2 absolute compared against 14.7 lbs/in^2
at sea level absolute. That leaves any type of plug or wall structure
of the capacitor having to withstand 11 lbs/in^2 across it.
Also, the
rbus...@es.com wrote:
>
> This is not a safety or EMI question, but because this group has such
> broad backgrounds and diversity I am hoping that someone can comment.
>
> I have been asked by one of our customers to ensure that our equipment
> is capable of being shipped in an un-pressurized air
Rick writes:
>This is not a safety or EMI question, but because this group has such
>broad backgrounds and diversity I am hoping that someone can comment.
>I have been asked by one of our customers to ensure that our equipment
>is capable of being shipped in an un-pressurized aircraft for altitud
Historically, the plastic IC packages shipped in this manner would
evaporate all their inner pressure out during shipment and upon arrival in
Los Angeles "suck" in the smoggy air to equalize the pressure after
landing. This caused a very early failure mode that took a really bright
engineer to fin
14 matches
Mail list logo
