JBL ON STAGE (serv.man5) 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
May 21, 2004
Harman Multimedia JBL OnStage EMC Test Report
2004 050310 EMC
69 of 80
Photograph 10. Voltage Dips/Short Interruptions Test Configuration;
Powerline Harmonics and Flicker Test Configuration
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
May 21, 2004
Harman Multimedia JBL OnStage EMC Test Report
2004 050310 EMC
70 of 80
APPENDIX A
A. Conducted & Radiated Emissions Measurement Uncertainties
1. Introduction
ISO Standard 17025 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
May 21, 2004
Harman Multimedia JBL OnStage EMC Test Report
2004 050310 EMC
71 of 80
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
ISO Guide to the Expression of Uncertainty in Measurement (ISO, 1993)
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
May 21, 2004
Harman Multimedia JBL OnStage EMC Test Report
2004 050310 EMC
72 of 80
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 10012-1 (1993-05-01), ISO Standard 17025, ISO-9000 and EN 45001.
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.
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