[SI-LIST] Re: Emission
- From: "npischl" <npischl@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 09 Feb 2004 16:28:39 -0000
Obviously, fixing the chamber is the best solution to the
measurement problem. Disconnect everything from the chamber and
power down all devices used, and you or your EMC test personnel
should be able to quickly figure out where and why it is leaking.
There are techniques for measuring signals in the amient too, often
used on the Open Area Test Sites. The simplest is to look at the
signal with small span and lowered resolution BW. If you lower the
BW down from the required 120 kHz, you should be able to distinguish
between the emission from your DUT and the ambient. Turning the DUT
on and off may help. If you are lucky, and the DUT emission doesn't
change with the change of the BW, that means the signal is
narrowband and you can take the measurement with the lowered BW.
Neven
--- In si-list@xxxxxxxxxxxxxxx, BRanjul@xxxx 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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