IIRC, one of the standards I read some years ago would allow for noise
levels of -6 dB or more relative to the limit line. Remember the old
average power interview question? "Within 1 dB, what's the average of 23
dBm, -1 dBm, and -11 dBm?" Similarly, if the ambient is enough lower
than the limit, the result will be within the permissible accuracy of
the test.
That doesn't mean – at that level – it would be below the limit once the
error was added!
Cortland Richmond
On 4/17/2019 12:46 PM, Grasso, Charles wrote:
To those wondering what the background and conclusion to that question
was:
_Background_: Our testing was performed in a newly minted
chamber so proper
EMC installation of our product was challenging.
_Effect_: Ingress of high levels of external bb noise.
_Result_: Proper install eliminated the external
noise and now the system passed.
_Concern_: While I accept that proper installation and operation of
our system is our
responsibility, I had expected that the tester would point to the
excessive ambient
and indicate that our data may not be valid. An inexperienced customer
would
have left thinking that their product had failed.
Am I wrong?
Thanks!
Charles Grasso
W: 303-706-5467
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