Declaration of Conformity
International Standards Laboratory
Report Number: ISL-99135FB
(NVLAP Lab. Code: 200234-0)
-24-
4.10 Appendix
J:
Accuracy of Measurement
Uncertainties
Contribution
Contribution
Radiation
Conduction
3 m
10 m
Phase
Neutral
System Repeatability
(assessment from 20 repeat
observation)
Normal (K=2)
±
0.56
±
0.5
±
0.20
±
0.20
Random
(assessment from 20
random observation)
Normal (K=2)
±
1.28
±
1.14
±
0.54
±
0.58
Receiver Specification
Rectangular
±
1
±
1
±
1
±
1
Antenna Factor Calibration
Normal (K=2)
±
2
±
2
NA
NA
Cable Loss Calibration
Rectangular
±
0.5
±
0.5
±
0.5
±
0.5
Combined Standard
Uncertainty Uc (y)
Normal
±
1.38
±
1.34
±
0.70
±
0.71
Total Uncertainty @95%
min. confidence probability
(U)
Normal (K=2)
±
2.76
±
2.68
±
1.40
±
1.42
Measurement Uncertainty Calculations:
Uc (y) = square root ( u
1
(y)
2
+ u
2
(y)
2
+ ..........+u
n
(y)
2
)
U = 2 * Uc (y)
Note: The measurement Uncertainties mentioned above also refer to NIS 81-1994 of NAMAS : The
treatment of Uncertainty in EMC Measurement.
