Describes digital recorders and digital oscilloscopes used for measurements during tests with high impulse voltages and currents. It specifies the measuring characteristics and calibrations required to meet the measuring accuracies and procedures specified in IEC 60-1. Covers normative references, conditions of use, definitions and symbols, input impedance, calibration and analysis, accuracy requirements for impulse measurements, performance tests, performance checks and record of performance. BS AMD 7925 RENUMBERS THIS STANDARD TO BS EN 61083 PT1