Specifications

B-field Exposure From Induction Cooking Appliances 32
Table 10: Measurement uncertainty evaluation. As described in IEEE 1528-2003, the tolerance,
the probability distribution (R = Rectangular distribution), the divisor used to get standard un-
certainty, the sensitivity coefficient c
i
, the uncertainty components u
i
and the combined standard
uncertainty u
c
are given.
Tol. Prob. Div. c
i
u
i
v
i
Error Description (±dB) Dist. (±dB)
Narda probe ELT-400
- Narda probe ELT-400 specification ±0.34 R
√
3 1 ±0.20 ∞
- Error due to non-perfect frequency response ±0.80 R
√
3 1 ±0.46 ∞
- Error due to non-perfect spherical isotropy ±0.20 R
√
3 1 ±0.12 ∞
- Error due to non-perfect linearity ±0.05 R
√
3 1 ±0.03 ∞
System repeatability
- Centering of the pot on the hob ±0.90 R
√
3 1 ±0.52 ∞
- Water volume and evaporation ±0.21 R
√
3 1 ±0.12 ∞
- Alignment of probe to appliance edge ±0.19 R
√
3 1 ±0.11 ∞
- Probe positioning on the robot arm -
- Robot arm positioning -
- Variation in the mains power supply -
Combined standard uncertainty u
c
±0.75 ∞
Coverage factor for 95 % kp= 2
Expanded uncertainty ±1.50
All error contributions considered are given in Table 10 and are assumed to be random and
uncorrelated. In a conservative evaluation of all uncertainties, the error distribution is assumed
to be rectangular. The combined uncertainty u
c
is obtained by taking the square root of the
sum of squares of the individual uncertainties u
i
according to [7, 8, 9]:
u
c
=
v
u
u
t
n
X
i=1
u
2
i
(9)
Throughout this report all B-fields measured are given with the uncertainty u
c
= ±1.50 dB.