Transfer impedance measurements have been performed both in
frequency and time domains. CW measurements were performed using a
matched triaxial system, a quintaxial system, and stripline injection.
For nuclear electromagnetic pulse (NEMP) purposes, measurements up to a
maximum frequency of 200 MHz are sufficient. For this frequency range
the matched triaxial system was found to be the most ... [Show full abstract] convenient.
Amplitude and phase measurements in different cables are discussed.
Direct and indirect injection was employed in the time domain
measurements. A delayed coupling is demonstrated when the diffusion term
is dominant in the transfer impedance. In a magnetically shielded cable,
hysteresis and saturation effects have been observed. At 5 kA the
transfer impedance of the magnetically shielded cable increased by an
order of magnitude due to saturation