Metrological support of the measurement of large current pulses at super-high voltages encounters many difficulties. They are caused, first of all, by the complexity of designing and certifying reference devices having wide frequency and dynamic measurement ranges. A possible way to overcome these difficulties is the use of magnetooptical current converters based on the Faraday effect as measurement standards. Magnetooptical effects in diamagnetic glasses of which current converters are usually produced are frequency independent up to about 1011Hz [i]. Such converters can thus be certified at dc or line currents, and the conversion factor can be assumed to be constant over a wide range of frequencies. The upper limit of this range depends on the inertia of the device which converts the angle of rotation of the polarization plane into an electric signal and amounts to 10G-10 s Hz. The speed of response of a magnetooptical current converter is also affected by the form and dimensions of the Faraday cell which acts as the primary transducer.