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We present details on the current measurement setup at PTB used for high
precision loss calibrations in the frequency range 50 Hz to 1 kHz. A
combination of analog and digital feedback control is utilized in accordance
with the standard. A detailed measurement uncertainty (MU) analysis based on a
systematic model equation is presented and inter-dependencies of model
parameters are discussed. Experimental results obtained at 50 Hz on NO and GO
Epstein samples show excellent agreement between statistical and systematic MU
estimation and confirm the MU model analysis. Furthermore, we investigate the
influence of external parameters on the loss measurements, like sample loading
scheme and the value of maximum demagnetization polarization.
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