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Atlas Compliance & Engineering, Inc.
1792 Little Orchard Street
San Jose, CA 95125
Phone 408.971.9743
Fax 408-971-9783
Web www.atlasce.com
Test Methods for Emissions
EUT Setup
In general, the equipment under test (EUT) and the peripherals listed were setup
in a manner that represented their normal use. Any special conditions required for the
EUT to operate normally that was necessary in order to carry out that particular test are
identified in the Test Configuration section and comments that accompany the test data.
The EUT was operated at the rated (nominal) operating voltage and typical load
conditions for which it was designed. Additionally a complete description of all ports and
I/O cables are included in the test configuration pages. If a remotely located device is
used, it is located at a distance sufficient to ensure that it does not contribute to the
measured level. The cabling from the remote device to the EUT is through an
underground PVC conduit to the center of the turntable.
The AC power line and I/O cables were routed consistent with the typical
application by varying the configuration of the test sample. Interface cables were
connected to the available I/O ports of the test unit. This configuration was precisely
noted in the test report photographs and diagrams. I/O cables were of the type and length
specified in the individual requirements.
If the length of cable between pieces of equipment, and the manufacturer did not
provide specifications on their spacing, the interval between different pieces of
equipment was about 10 centimeters.
If the length of cable between pieces of equipment was longer than necessary, all
excessive cable was bundled with 30-40 cm lengths in a serpentine fashion. If the cable
could not be bundled in this fashion, it was arranged so as not to come within 40 cm of
the ground plane. For more detail on the disposition of the cables during the test, refer to
the information contained in the test configuration page and on worst case photographs
shown on the test setup pages.
Emissions Test Procedure
The test procedure stated in ANSI C63.4-2014 was used to collect the test data.
The radiated and conducted emission data of the EUT was taken with the Rohde &
Schwarz EMI Test Receiver. Incorporating the application of correction factors
programmed into the Test Receiver and verified for distance, antenna, cable loss, and
amplifier gain, the data was reduced as shown in the Sample Calculations. These
correction factors are available to the client upon request. The corrected data was then
compared to the CISPR 22 Class A ITE emission limits to determine compliance.
Preliminary and final measurements were taken in order to ensure that all
emissions from the EUT were found and maximized. Preliminary testing may be
performed in an anechoic chamber to identify all frequencies produced by the test system.
Due to the anomalies of the chamber, which can lead to significant errors in amplitude
