[SI-LIST] Re: Emission
- From: "Grasso, Charles" <Charles.Grasso@xxxxxxxxxxxx>
- To: "'Kbalasubramanian@xxxxxxxxxxxxxx'" <Kbalasubramanian@xxxxxxxxxxxxxx>,"'weirsp@xxxxxxxxxx'" <weirsp@xxxxxxxxxx>
- Date: Mon, 9 Feb 2004 14:37:45 -0700
Depending on the actual design of the chamber you should get better than
60dB of shielding. 60dB is a factor of 1000 : that is any ambients are
reduced by 1000 times inside the room - that is pretty close to zero.
Typical double walled shield rooms are 100dB or better which translates
to 100000!!
My guess is that a cable is entering the room that need to be addressed.
Best Regards
Charles Grasso
Senior Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Email: charles.grasso@xxxxxxxxxxxx;
Email Alternate: chasgrasso@xxxxxxxx
-----Original Message-----
From: Kbalasubramanian@xxxxxxxxxxxxxx
[mailto:Kbalasubramanian@xxxxxxxxxxxxxx]
Sent: Monday, February 09, 2004 12:01 AM
To: weirsp@xxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx; si-list-bounce@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Emission
Dear Steve,
In that case what is the permissible level of noise in a fully
anechoic chamber. I guess the noise cannot be at 'zero' level.
Sincerely
K.Balasubramanian
Sr.Engineer, Hardware.
steve weir <weirsp@xxxxxxxxxx>
Sent by: si-list-bounce@xxxxxxxxxxxxx
02/09/2004 11:45 AM
Please respond to weirsp
To: BRanjul@xxxxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
cc:
Subject: [SI-LIST] Re: Emission
If your background is that high, you don't have a useful anechoic
chamber. You need to fix that.
At 11:39 AM 2/9/2004 +0530, BRanjul@xxxxxxxxxxxxxx wrote:
>Dear all,
>Please help me to sort out this problem.
>While testing our equipment in the anechoic chamber in our place, we
could
>notice that nearly 30db ambient noise present (say at 100Mhz) in the
>chamber before the equipment is tested.
>Then , if the our equipment fails at 100Mhz for 0.5 db does it really
>fail?
>Or if the equipment passes by 1 db margin, does it really pass ?
>
>Ranju
>
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