The inductance of imploding cylindrical wire array z-pinches has been determined from
measurements of load voltage and current. A thorough analysis method is presented that explains
how the load voltage of interest is found from raw signals obtained using a resistive voltage
divider. This method is applied to voltage data obtained during z-pinch experiments carried out on
the MAGPIE facility (1.4 MA, 240 ns rise-time) in order to calculate the load inductance and
thereafter the radial trajectory of the effective current sheath during the snowplough implosion.
Voltage and current are monitored very close to the load, allowing these calculations to be carried
out without the need for circuit modelling. Measurements give a convergence ratio for the current
of between 3.1 and 5.7 at stagnation of the pinch.