KC,
You don't mention what organization/standard that you are undergoing an
audit with, I'll assume ISO 17025. I think you are correct that it would
be very difficult if not impossible to meet the requirements when you add
in uncertainty that takes into account the receiver, antennas, pre-amp and
such.
I think you can go about this two ways. The first would be ANSI
C63.4-1992 section 5.4.6.2 it states.
"The +/- 4 dB tolerance in 5.4.6.1 includes instrumentation calibration
errors, measurement technique errors and errors due to site anomalies."
The other way is if you are being audited to ISO 17025 section 5.4.6.2
Note 2. This may be a long shot. I am not an expert in ISO 17025 , but
would mention it. I think that NSA would qualify as a "well-recognized test
method".
The last thing I would say is that there is currently no requirement by
any governing body for uncertainty to be included in the NSA results.
Technically the governing body is your customer, they define the method
used and how the results are reported.
Thanks,
Craig
[email protected]
Sent by: To:
[email protected]
owner-emc-pstc@majordo cc:
mo.ieee.org Subject: NSA measurement
and its uncertainty
07/17/2002 03:53 AM
Please respond to
kcchan
Hi all
I just got a tough question from our auditor about NSA and uncertainty. He
asked if we will include the uncertainty into our Normalized Site
Attenuation measurement or not.
If we include the uncertainty of NSA measurement, it is impossible for us
to ensure it is within the +/- 4dB with 95% CL.
I would like to seek comment form the expertise if it is necessary to
include the uncertainty when we do the NSA measurement.
Thank you
KC Chan
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