18 Annex A
Narda SRM-3006 209
Disadvantages of this method
• Non-reproducible measurement
• No possibility of subsequently determining the location in the measured
volume where the maximum values occurred
• Requires a degree of experience in order to obtain meaningful results
• Measurement uncertainty is non-quantifiable: If a dipole-type antenna is
used, only those field components parallel to the dipole axis of the
antenna will be detected. If the antenna is not correctly oriented in the
field, there is a danger that only low emission levels or even no emission
will be detected, despite the presence of strong fields.
Limitations
• Spatial averaging of emissions not possible (see Chapter 12
Spatial Averaging starting on page 143 for more information).
• Underestimates the emissions in the presence of strongly elliptical
polarization.
• Non-definable measurement uncertainty: Measurement using a single
axis antenna only records the field components that are parallel to the
antenna axis. If the antenna is not correctly oriented in the field, there is a
danger that only low emission levels or even no emission will be detected,
despite the presence of strong fields.
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