Jon Griver wrote
"Cynthia, when you do your statisitics, don't take the 0dB's into account, as
these do not refer to confidence margin, but to the test results of an
individual sample submitted to a test lab"
I am planning on presenting the results in a few different ways
so that the data can be intrepretated properly.
The rumor mill says that the hardware manager has heard
what I am up to and replied " I don't care how many emails
she collects. She's not making 3dB the rule. I'll fight her
all the way up to Erv (president) if I have to."
That's like waving a red flag infront of a bull. Maybe I should
stick with 6 dB just to really get his goat!!!!! Oh what fun the
life of a homologation manager!!!!
Cynthia
treg @ world.std.com
10/15/96 05:12 PM
To: treg <treg @ world.std.com> @ SMTP
cc:
Subject: Re: dBmargin
Doug McKean wrote:
(Taken out of context)
>6dB would be comfortable.
>Unfortunately, I have been in a lab that passed at only 0.5dB.
There has been some confusion in this discussion between the test lab's
responsibilities and the manufacturer's responsibilities.
The test lab tests the sample(s) the manufacturer submits. The lab's
responsibility is to test the product in a professional manner according to
the standards requested by the manufacturer. A margin of 0dB is a pass and
the manufacturer has the right to expect the test lab to issue a pass test
report.
The manufacturer's responsibility is to comply with the EMC Directive (or
other regulations around the world). If the manufacturer does not realise
it, the lab should explain to him that a 0dB margin means that most likely a
large percentage of his production will be over the limit, and that he
should be aiming for a margin of xdB to give him a particular level of
confidence that his production complies.
Cynthia, when you do your statisitics, don't take the 0dB's into account, as
these do not refer to confidence margin, but to the test results of an
individual sample submitted to a test lab.
Jon Griver
ITL (Product Testing) Ltd.
[email protected]
