ON TOUR XTB (serv.man12) - JBL Audio EMC - CB Certificate (repair manual). Page 32

 

 

 

 

 

 

APPENDIX A 

A. Radiated Emissions Measurement Uncertainties 

 
1.   Introduction 
 
ISO/IEC 17025:2005 and ANSI/NCSL Z540.3: 2006 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 

Radiated Emissions Measurement Detection Systems 

Applicable Frequency 

Range 

"U” for a k=2 

Coverage Factor 

Spectrum Analyzer with QPA & Preamplifier 

30 MHz - 200 MHz 

+3.9 dB, -4.0 dB 

Spectrum Analyzer with QPA & Preamplifier 

200 MHz-1000 MHz 

+/- 3.5 dB 

Spectrum Analyzer with Preamplifier 

1 GHz - 18 GHz 

+2.5 dB, -2.6 dB 

Spectrum Analyzer with 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