1. A method for calibrating a digital-to-analog converter (DAC) comprising the steps of: exciting inputs of the DAC under test from an excitation means generating known digital excitation signals, each said excitation signal being applied at a single digital bit input of the DAC under test and each said excitation signal being binary and orthogonal with respect to all other ones of said excitation signals, the sum of said excitation signals consisting of a maximum entropy sequence of uniform amplitude probability, said DAC under test producing an analog output signal; providing said analog output signal of the DAC under test at an analog input of an analog-to-digital converter (ADC), the transfer function of said ADC having been characterized by premeasured weighting values of a set of binary orthogonal functions, said ADC producing digital output signals; transforming said digital output signals from time domain digital signals into binary transform domain digital signals to obtain an output response weighting coefficient for each bit of the converter under test; and correcting each said output response weighting coefficient for bias errors induced by said ADC by multiplying each output response weighting coefficient by the reciprocal of each corresponding said premeasured weighting values in a bias correction means in order to obtain unbiased weighting values of each bit specifying the transfer characteristic of the digital-to-analog converter under test.