Hi Brian.
Just to add a little more fuel to the flames! We
supplied an Instrument to a well known semiconductor Manufacturer in Oregon
which was powered from two 220 volt phases. I marked the rating plate as 220
volt one phase as has been suggested. However the local inspector made us
Hi Scott, Chris et al.
Your stories of decoupling caps reminded me of a delightful cost reduction
exercise I was involved in.
A company was making grinding machinery for Engineering, and they had
instituted a fierce cost reduction exercise on the Electronics, including the
Vibration Analysis
Hi Ghery.
You wrote:
The law is 89/336/EEC, the EMC Directive (or as I like to call it, the EMC
Professional Employment Act of 1989). It lays down, as you note, the
essential requirement that a product not cause undue interference and that
it operate as intended in its itended
Hi Chris.
You asked:
What types of noise sources within a typical power supply or product would
produce emissions in this frequency range?
Sorry if this is teaching you to suck eggs...
Any bridge rectifier/capacitor filter will generate Conducted EMI is that
frequency range, due to the
Hi Mark.
You asked:
why do so many battery operated equipments
state that they must not be operated using rechargeable batteries?
There is no one all-purpose reason, but the two main ones, at least the ones
I worry about with battery powered stuff, are:
1. As you already implied,
In a message dated 06/10/00 14:34:45 GMT Daylight Time, brian_ku...@leco.com
writes:
I feel that
overcurrent protection should be on all current carrying conductors. With a
230V~ product you never know where in the world the product will be shipped,
if
the AC Main has a grounded neutral,
Hi Ken.
On the subject of TCF and waiving tests, lets say you were to waive a test
because its non-applicable. For instance, line conducted when the unit is
battery powered. Does this mean that you are required to go the TCF route?
No.
The TCF route to compliance usually means that you
Hi Tin.
I am interested in knowing the basis of your response to items 1 and 2, as
it is contrary to my understanding of the EMC Directive.
I carefully qualified my comments with the words, 'In the UK'. The UK view
on the EMC Directive is put into UK law in the form of The Electromagnetic
In a message dated 29/09/00 15:15:08 GMT Daylight Time, Daryl Alden writes:
Can anybody advise me whether an MRA (mutual recognition agreement )exsists
between the EU and the US?
If so does this mean that electrical and mechanical products tested to CE
standards do not need further approval
In a message dated 29/09/00 15:43:06 GMT Daylight Time, fr...@amcomm.com
writes:
I'm just getting started in the world of EMI and would like to ask a few
questions. I'm not sure if I should be going the TCF route or the Standards
Route. The company that I work for manufactures products
In a message dated 27/07/00 17:58:48 GMT Daylight Time,
bigg...@gemischova.ge.com writes:
Has anyone on this list heard of standard SEMI F47? Is there a similar
european standard to this? What exactly does the standard deal with?
Hi Daniel.
The SEMI standards relate to Semiconductor
Hi Rob.
You wrote:
Is there any possibility of getting the EMC and product safety postings
partitioned ~ to assist in cutting surplus mail traffic?
The name of the List is EMC-PSTC, (ElectroMagnetic Compatbility - Product
Safety Technical Committee) i.e. it' covers all the material required
In a message dated 03/03/00 12:28:55 GMT Standard Time, cet...@cetest.nl
writes:
In my opinion both TCF and Technical Documentation is meant to be the same
in EC language.
Hi Gert.
Here's another way of coming at it.
In the UK EMC Regulations, which is UK Law, the term 'Technical
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