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(Color online) Four point probe with sprung loaded pin electrodes.
(Color online) Contact points for current (P 1 and P 2) and voltage electrodes (Q 1 and Q 2).
(Color online) Variation of potential drop ΔV(t), solid line, for a step function current excitation, Eq. (1). The dashed lines show the contribution from (a) terms containing ρ 11 and ρ 22 for the case in which ρ 22 = ρ 11 = 10 mm and the associated relaxation has a time constant . (b) Terms containing ρ 21 and ρ 12 for ρ 21 = ρ 12 = 20 mm and time constant 20 ms.
(Color online) Variation of ρfν (ρ, t) with time for a step function current (τ = 0) and for a drive current with exponential rise times τ = 5, 20, and 80 ms. In each case, μσρ 2 = 5.0 ms.
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