General Information 1-5
1.6 Isotropic E&H field
analyzer EHP-50G
uncertainty
and anisotropy
The uncertainties have been determined according to EA-4/2 [4] and are
expressed as relative values.
They were estimated as expanded uncertainty obtained multiplying the
standard by the coverage factor k=1.96, corresponding to a confidence level
of about 95%.
1.6.1 Measurements
Uncertainty of EHP-50G
(Spectrum mode)
The total uncertainty derived from contributions of linearity, anisotropy,
frequency response, temperature, relative humidity and with/without
contribution of uncertainty of calibration.
Magnetic probe
(1)
Magnetic flux
density
range
Total expanded uncertainty (k=1.96)
Without contribution of
uncertainty of calibration
U
T EHP50G
(%)
With contribution of
uncertainty of
calibration U
TOT
(%)
Frequency at 50/60 Hz
50 nT to < 100 µT 2.4 3.1
(2)
100 µT to 3000 µT 2.6 4.3
(4)
Frequency from 5 to 40 Hz 50 nT to 10.0 µT 5.2 5.9
(3)
Frequency from 40 Hz to 100 kHz 50 nT to 10.0 µT 4.8 5.6
(3)
Frequency from 100 to 400 kHz 50 nT to 10.0 µT 7.5 8.1
(3)
(1) This uncertainty budget is for an ambient temperature of (23 +/- 4) °C, and relative humidity of (50 +/- 5) %
The expanded uncertainty for magnetic flux density for values close to 50 nT is calculated with negligible contribution
of noise level.
(2) The expanded uncertainty of calibration
U
Cal
used is 2,0%
(3) The expanded uncertainty of calibration
U
Cal
used is 3.0%
(4) The expanded uncertainty of calibration
U
Cal
used is 3.5%
Electric probe
(5)
Electric field
range
Total expanded uncertainty (k=1.96)
Without contribution of
uncertainty of calibration
U
T EHP50G
(%)
With contribution of
uncertainty of
calibration U
TOT
(%)
Frequency at 50/60 Hz
1 V/m to 1000 V/m 6.9 7.5
(6)
1 V/m to < 40 kV/m 7.6 8.1
(6)
Frequency from 5 Hz to 100 kHz 1 V/m to < 1000 V/m 8.8 10.3
(7)
Frequency from 100 to 400 kHz 1 V/m to < 1000 V/m 9.4 10.8
(7)
(5) This uncertainty budget is for an ambient temperature of (23 +/- 4) °C, and relative humidity of (50 +/- 5) %
(6) The expanded uncertainty of calibration
U
Cal
used is 3.0%
(7) The expanded uncertainty of calibration
U
Cal
used is 5.5%
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