Cattron North America 818TX Wireless Controller User Manual
Laird Controls North America Inc. Wireless Controller Users Manual
Users Manual
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APPENDIX A
OWNERS MANUAL
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UNCERTAINTY TOLERANCE
DNB Engineering’s Fullerton Facility is within acceptable uncertainty tolerances per ANSI
C63.4 (1992) sections 5.4.6.1 and 5.4.6.2.
ANSI C63.4 (1992)
5.4.6.1 Site Attenuation. A measurement site shall be considered acceptable for radiated
electromagnetic field measurements if the horizontal and vertical NSA derived from
measurements, i.e., the “measured NSA,” are within ±4 dB of the theoretical NSA
(5.4.6.3) for an ideal site.
5.4.6.1 NSA Tolerance. The ±4 dB tolerance in 5.4.6.1 includes instrumentation
calibration errors, measurement technique errors, and errors due to site anomalies.
These errors are analyzed in ANSI C63.6-1988 [3], wherein it is shown that the
performance of a well-built site contributes only 1 dB of the total allowable tolerance.
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1.1 INFORMATION PERTAINING TO EQUIPMENT MANUFACTURED
AFTER COMPLIANCE TESTING
It is prudent that manufacturers have an established Quality Assurance program to
spot check their products on a periodic basis, either based upon time or quantities
produced. Obviously, a change in the engineering design should be sufficient
justification for a re-test.
The Quality assurance test need not be formal Verification or Certification such as
required during the initial production of the product. However, it should be sufficient in
scope to assure that the EMI characteristics of the product have not changed to the
degree that the product exceeds the FCC limits. If a new model of a product is
produced, it must undergo full Verification or Certification testing and, in case of
Certification, be filed with the FCC.
It is expected that the FCC will place greater emphasis and resources in spot checking
commercially available products. If a product is found not to be compliant with the
Limits specified in Part 15, Subpart B. the manufacturer will be subject to the
appropriate penalties imposed by the Commission. The initial Certification or
Verification is sufficient to justify initial production. The additional quality assurance
testing performed is the manufacturer’s responsibility to assure continued compliance.