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REPORT # 56050AF
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3. OCCUPIED BANDWIDTH – PER ANSI C63.4 ANNEX I.6
3.1 Test Setup and Procedure
The Test Site and EUT were set up as described in section 2.1 of this document.
The EUT is put into the operational test mode as stated in Section 1.4 and then
started. The spectrum analyzer had its self-calibration performed, and then set to
the frequency to be tested, with a bandwidth of 10kHz as per ANSI C63.4 Annex
I.6 paragraph b. The Max Peak of the Fundamental Frequency was noted, and the
points 20 dB dB below the Fundamental Max Peak, for both sides of the signal
was noted, and the frequency difference between these points was recorded as
the occupied bandwidth. See below for example.
The EUT is put into the operational test mode as stated in Section 1.4 and then
started. The spectrum analyzer had its self-calibration performed, and then set to
the frequency to be tested, with a bandwidth of 10kHz as per ANSI C63.4 Annex
I.6 paragraph b. The Max Peak of the Fundamental Frequency was noted, and the
points 20 dB dB below the Fundamental Max Peak, for both sides of the signal
was noted, and the frequency difference between these points was recorded as
the occupied bandwidth. See below for example.
Example Of Occupied Bandwidth Measurement
3.2 Occupied Bandwidth Test Data.
Frequency
(MHz)
Measured
Bandwidth
Bellow
Fundamental
Polarity
Instrument
Bandwidth
Required
Occupied
Bandwidth
Result
Comments
433.9
68.4 kHz
20dB
Vertical
10kHz
1.085 MHz
Pass
433.9
62.7 kHz
20dB
Horizontal
10kHz
1.085 MHz
Pass
Refer to section 3.3 for Test Data
20dB
Occupied
20dB Points
20dB Points
Max Peak of Fundamental
Instrumentation Bandwidth set as described in ANSI C63.4 Annex I.6
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3.3 Occupied Bandwidth
Vertical
Horizontal
REPORT # 56050AF
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4. APPENDIX SECTION
4.1 APPENDIX A: UNCERTAINTY TOLERANCE
DNB Engineering’s Utah Facility is within acceptable uncertainty tolerances per ANSI C63.4
sections 5.4.6.1 and 5.4.6.2 as well as CISPR 16-1 Annex M, section M.2.
sections 5.4.6.1 and 5.4.6.2 as well as CISPR 16-1 Annex M, section M.2.
ANSI C63.4
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-[3], wherein it is shown that the performance
of a well-built site contributes only 1 dB of the total allowable tolerance.
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-[3], wherein it is shown that the performance
of a well-built site contributes only 1 dB of the total allowable tolerance.
CISPR 16-1
M.2 Error analysis
. . . The total estimated errors are the basis for the + 4 dB site acceptability criterion
consisting of approximately 3 dB measurement uncertainties and an additional allowable
1 dB for site imperfections.
consisting of approximately 3 dB measurement uncertainties and an additional allowable
1 dB for site imperfections.
4.2 APPENDIX B: SITE CHARACTERISTICS,
CHALK CREEK EMI TEST SITE
The DNB Engineering test facility is located in Chalk Creek Canyon near Coalville, Utah.
Site characteristics were measured according to the procedures outlined in ANSI C63.4
“Characteristics of Open Field Test Site”. The results of these characterizations indicate
that the Chalk Creek site is an outstanding facility to perform accurate and repeatable
EMI tests.
Site characteristics were measured according to the procedures outlined in ANSI C63.4
“Characteristics of Open Field Test Site”. The results of these characterizations indicate
that the Chalk Creek site is an outstanding facility to perform accurate and repeatable
EMI tests.
4.2.1 Ambient Emissions
Ambient Emission measurements were made to determine the level of the ambient
emanations at the DNB test facility. The results indicate that all ambient signals are
below the FCC Radiated Emission limits or that each can easily be identified as an
ambient signal.
emanations at the DNB test facility. The results indicate that all ambient signals are
below the FCC Radiated Emission limits or that each can easily be identified as an
ambient signal.
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4.2.2 FCC Certification
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