JBL ON STAGEII (serv.man6) EMC - CB Certificate ▷ View online
Nemko USA, Inc.
11696 Sorrento Valley Road, Suite F, San Diego, CA 92121
Phone (858) 755-5525 Fax (858) 452-1810
DATE
DOCUMENT NAME
DOCUMENT #
PAGE
Janurary 5,2006
Harman Multimedia OnStage UD CE Test Report
2006 011114 CE AUS/NZ
61 of 72
APPENDIX A
A. Conducted & Radiated Emissions Measurement Uncertainties
1. Introduction
ISO/IEC 17025:1999 and ANSI/NCSL Z540-1-1994 require that all measurements contained in a test report be
“traceable”. “Traceability” is defined in the International Vocabulary of Basic and General Terms in
Metrology (ISO: 1993) as: “the property of the result of a measurement... whereby it can be related to stated
references, usually national or international standards, through an unbroken chain of comparisons, all having
stated uncertainties”.
The purposes of this Appendix are to “state the Measurement Uncertainties” of the conducted emissions and
radiated emissions measurements contained in Section 5 of this Test Report, and to provide a practical
explanation of the meaning of these measurement uncertainties.
2. Statement of the Worst-Case Measurement Uncertainties for the Conducted and
Radiated Emissions Measurements Contained in This Test Report
Table 1: Worst-Case Expanded Uncertainty "U" of Measurement for a k=2 Coverage Factor
Conducted Emissions Measurement Detection Systems
Applicable Frequency
Range
"U” for a k=2
Coverage Factor
HP8568B Spectrum Analyzer with QPA and HP8447F Preamplifier
150 kHz - 30 MHz
+/- 3.0 dB
HP8566B Spectrum Analyzer with QPA and Preselector
9 kHz - 30 MHz
+/- 2.9 dB
Radiated Emissions Measurement Detection Systems
Applicable Frequency
Range
"U” for a k=2
Coverage Factor
HP8568B Spectrum Analyzer with QPA & HP8447F Preamplifier
30 MHz - 200 MHz
+4.0 dB, -4.1 dB
HP8568B Spectrum Analyzer with QPA & HP8447F Preamplifier
200 MHz-1000 MHz
+/- 3.5 dB
HP8566B Spectrum Analyzer with QPA & Preselector
30 MHz - 200 MHz
+3.9 dB, -4.0 dB
HP8566B Spectrum Analyzer with QPA & Preselector
200 MHz-1000 MHz
+/- 3.4 dB
HP8566B Spectrum Analyzer with QPA & HP 8449A Preamplifier
1 GHz - 18 GHz
+2.5 dB, -2.6 dB
HP8566B Spectrum Analyzer with QPA & HP8449A Preamplifier
18 GHz - 40 GHz
+/- 3.4 dB
NOTES:
1. Applies to 3 and 10 meter measurement distances
2. Applies to all valid combinations of Transducers (i.e. LISNs, Line Voltage Probes, and Antennas, as appropriate)
3. Excludes the Repeatability of the EUT
1. Applies to 3 and 10 meter measurement distances
2. Applies to all valid combinations of Transducers (i.e. LISNs, Line Voltage Probes, and Antennas, as appropriate)
3. Excludes the Repeatability of the EUT
Nemko USA, Inc.
11696 Sorrento Valley Road, Suite F, San Diego, CA 92121
Phone (858) 755-5525 Fax (858) 452-1810
DATE
DOCUMENT NAME
DOCUMENT #
PAGE
Janurary 5,2006
Harman Multimedia OnStage UD CE Test Report
2006 011114 CE AUS/NZ
62 of 72
3. Practical Explanation of the Meaning of the Conducted and Radiated Emissions
Measurement Uncertainties
In the specific case of EMC Measurements in this test report, the measurement uncertainties of the conducted
emissions measurements and the radiated emissions measurements have been calculated in accordance with the
method detailed in the following documents:
o
ANSI Z540.2 (2002) Guide to the Expression of Uncertainty in Measurement
o
NIS 81:1994, The Treatment of Uncertainty in EMC Measurements (NAMAS, 1994)
o
NIST Technical Note 1297(1994), Guidelines for Evaluating and Expressing the Uncertainty of NIST
Measurement Results (NIST, 1994)
The calculation method used in these documents requires that the stated uncertainty of the measurements be
expressed as an “expanded uncertainty”, U, with a k=2 coverage factor. The practical interpretation of this
method of expressing measurement uncertainty is shown in the following example:
EXAMPLE: Assume that at 39.51 MHz, the (measured) radiated emissions level was equal to +26.5
dBuV/m, and that the +/- 2 standard deviations (i.e. 95% confidence level) measurement uncertainty was
+/- 3.4 dB.
In the example above, the phrase “k = 2 Coverage Factor” simply means that the measurement uncertainty is
stated to cover +/-2 standard deviations (i.e. a 95% confidence interval) about the measurand. The measurand is
the radiated emissions measurement of +26.5 dBuV/m at 39.51 MHz, and the 95% bounds for the uncertainty
are –3.4 dB to + 3.4 dB. One can thus be 95% confident that the “true” value of the radiated emissions
measurement is between +23.1 dBuV/m and +29.5 dBuV/m. In effect, this means that in the above example
there is only a 2.5% chance that the “true” radiated emissions value exceeds +29.5 dBuV/m.
Nemko USA, Inc.
11696 Sorrento Valley Road, Suite F, San Diego, CA 92121
Phone (858) 755-5525 Fax (858) 452-1810
DATE
DOCUMENT NAME
DOCUMENT #
PAGE
Janurary 5,2006
Harman Multimedia OnStage UD CE Test Report
2006 011114 CE AUS/NZ
63 of 72
APPENDIX B
B. Nemko USA, Inc.’s Test Equipment & Facilities Calibration Program
Nemko USA, Inc. operates a comprehensive Periodic Calibration Program in order to ensure the validity of all
test data. Nemko USA’s Periodic Calibration Program is fully compliant to the requirements of NVLAP Policy
Guide PG-1-1988, ANSI/NCSL Z540-1-1994, ISO 10012:2003, ISO/IEC 17025:1999, and ISO-9000:2000.
Nemko USA, Inc.’s calibrations program therefore meets or exceed the US national commercial and military
requirements [N.B. ANSI/NCSL Z540-1-1994 replaces MIL-STD-45662A].
Specifically, all of Nemko USA’s primary reference standard devices (e.g. vector voltmeters, multimeters,
attenuators and terminations, RF power meters and their detector heads, oscilloscope mainframes and plug-ins,
spectrum analyzers, RF preselectors, quasi-peak adapters, interference analyzers, impulse generators, signal
generators and pulse/function generators, field-strength meters and their detector heads, etc.) and certain
secondary standard devices (e.g. RF Preamplifiers used in CISPR 11/22 and FCC Part 15/18 tests) are
periodically recalibrated by:
o
A Nemko USA-approved independent (third party) metrology laboratory that uses NIST-
traceable standards and that is ISO Guide 25-accredited as a calibration laboratories by NIST; or,
o
A Nemko USA-approved independent (third party) metrology laboratory that uses NIST-
traceable standards and that is ISO Guide 25-accredited as a calibration laboratory by another
accreditation body (such as A2LA) that is mutually recognized by NIST; or,
o
A manufacturer of Measurement and Test Equipment (M&TE), if the manufacturer uses NIST-
traceable standards and is ISO Guide 25-accredited as calibration laboratory either by NIST or by
another accreditation body (such as A2LA) that is mutually recognized by NIST; or
o
A manufacturer of M&TE (or by a Nemko USA-approved independent third party metrology
laboratory) that is not ISO Guide 25-accredited. (In these cases, Nemko USA conducts an annual
audit of the manufacturer or metrology laboratory for the purposes of proving traceabilty to
NIST, ensuring that adequate and repeatable calibration procedures are being applied, and
verifying conformity with the other requirements of ISO Guide 25).
In all cases, the entity performing the Calibration is required to furnish Nemko USA with a calibration test
report and/or certificate of calibration, and a “calibration sticker” on each item of M&TE that is successfully
calibrated.
Nemko USA, Inc.
11696 Sorrento Valley Road, Suite F, San Diego, CA 92121
Phone (858) 755-5525 Fax (858) 452-1810
DATE
DOCUMENT NAME
DOCUMENT #
PAGE
Janurary 5,2006
Harman Multimedia OnStage UD CE Test Report
2006 011114 CE AUS/NZ
64 of 72
Calibration intervals are normally one year, except when the manufacture advises a shorter interval (e.g. the HP
8568B Spectrum Analyzer is recalibrated every six months) or if US Government directives or client
requirements demand a shorter interval. Items of instrumentation/related equipment which fail during routine
use, or which suffer visible mechanical damage (during use or while in transit), are sidelined pending repair and
recalibration. (Repairs are carried out either in-house [if minor] or by a Nemko USA-approved independent
[third party] metrology laboratory, or by the manufacturer of the item of M&TE).
Each antenna used for CISPR 11 and CISPR 22 and FCC Part 15 and Part 18 radiated emissions testing (and
Standard 17025-Accredited third-party Antenna Calibration Laboratory or by the antenna’s OEM if the OEM is
NIST or NVLAP ISO Standard 17025-accredited as an antenna calibration laboratory. The antenna
calibrations are performed using the methods specified in Annex G.5 of CISPR 16 (2003) or ANSI C63.4
(2003) , including the “Three-Antenna Method”. Certain other kinds of antennas (e.g. magnetic-shielded loop
antennas) are calibrated annually by either a NIST (or NVLAP) ISO Standard 17025-accredited third-party
antenna calibration laboratory, or by the antenna’s OEM if the OEM is NIST or NVLAP ISO Standard 17025-
accredited as an antenna calibration laboratory using the procedures specified in the latest version of SAE ARP-
958.
In accordance with FCC and other regulations, Nemko USA recalibrates its suite of antennas used for radiated
emissions tests on an annual basis. These calibrations are performed as a precursor to the FCC-required annual
revalidation of the Normalized Site Attenuation properties of Nemko USA’s Open Area Test Site. Nemko
USA, Inc. uses the procedures given in both Subclause 16.6 and Annex G.2 of CISPR 16 (2003) , and ANSI
C63.4 (2003) when performing the normalized site attenuation measurements.
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