Jarmo,
>>I have a strong feeling that instead of making any changes
to equipment we
should give instructions to user how to clean our products (with
damp towel,
not with duster).
Be careful about engineering equipment this way. If I take a race
car out to the drag strip and break an axle because I accelerated too hard.
And if the engineer of the race car tells me not to push the gas pedal down
so hard. I'll tell him to "go to hell" and I'll get a different race car.
The axle should be re-engineered to sustain the abuse I'm going to put it
through.
The same goes for any piece of equipment. If I have to lock that
piece of equipment up in a special room to make sure no-one inadvertently
touches it in the wrong way, you better hope that you have no competition,
or your competition is in the same predicament. (an EDX, or SEM machine are
good examples). Otherwise, I will buy the equipment that will not easily
get damaged.
I won't pretend that dusting any piece of electronic equipment with
a duster is acceptable, but it does and will happen every now and then.
I do believe the 70KV by the way. At 20% relative humidity during
the winter here in the desert, I get shocked every time I hop out of my car.
regards
Ryan G.
> -----Original Message-----
> From: Kiiski Jarmo [SMTP:[log in to unmask]]
> Sent: Tuesday, May 23, 2000 1:19 AM
> To: [log in to unmask]
> Subject: Re: [TN] Brush dust off on equipment with duster
>
> It wasn't a typo! It was measured with a handheld charge meter in a short
> distance from a duster in a low humidity (30 % R.H.) environment.
> Increasing
> the humidity to 50 % will degrease the charge to 35 kV.
>
> The problem is that our customer has used a duster to wipe of dust from
> the
> equipment and the LCD-drivers goes to Latch-Up-state with undesired
> consequences.
>
> Now there has been discussion about the sustainability of the equipment
> against such operation. There are solutions to improve the sustainability
> but the question is how to test it.
>
> I have a strong feeling that instead of making any changes to equipment we
> should give instructions to user how to clean our products (with damp
> towel,
> not with duster).
>
> B.R.
> Jarmo
>
> > -----Original Message-----
> > From: Phil Bavaro [SMTP:[log in to unmask]]
> > Sent: 22. toukokuuta 2000 18:36
> > To: [log in to unmask]
> > Subject: Re: [TN] Brush dust off on equipment with duster
> >
> > That has to be a typo.....70 kV is way too high to be generated with a
> > simple duster.
> >
> > Please tell us how this 70kV was measured and who makes it if in fact it
> > does generate that type of charge.
> >
> >
> > No matter what the actual number is, I would not want it around our ESDS
> > components. As far as equipment which is sealed up is concerned, it
> > really
> > depends on what it is.
> >
> >
> > Our policy is not to allow the dusters in our factories as we use a
> > topical
> > cleaner and a lint free wipe to remove dust.
> >
> >
> > Regards,
> >
> > Phil
> >
> > At 09:04 AM 5/22/00 +0300, Kiiski Jarmo wrote:
> > >Hi,
> > >
> > >Is there any ESD specialists listening!
> > >
> > >Should the electronic equipment sustain the use of duster?
> > >
> > >Is there a method to test the durability of equipment against duster?
> > >
> > >According to our experience the charge of a duster can be over 70 kV.
> > >
> > >B.R.
> > >Jarmo Kiiski
> > >
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