A transportable ac voltage source is described, in which sinusoidal signals are synthesized digitally in the audio-frequency range. The rms value of the output waveform may be calculated by measuring the dc level of the individual steps used to generate the waveform. The uncertainty of this calculation at the 7-V level is typically less than +5 ppm from 60 Hz to 2 kHz and less than + l o ppm from 30 Hz to 15 kHz.
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