BCR intercomparison of ac-dc current transfer standards

The established ac-dc current transfer standards and measurement set-ups of EC, IEN, LCIE, PTB, SP and VSL were intercompared in the current range from 10 mA to 20 A and in the frequency range from 10 Hz to 100 kHz. An agreement within 10 ppm to 30 ppm was obtained up to 100 mA, degrading to 100 ppm at 1 A (100 kHz) and 70 ppm at 10 A (20 kHz) and 20 A (5 kHz).<
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