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Transfer constants are low-frequency gains evaluated under different combinations of shorting and opening of reactive elements in the circuit. They are used in general time- and transfer constant analysis to determine the numerator terms and the zeros in the transfer function. The transfer constants are calculated under similar zero- and infinite-value conditions of reactive elements used in the Cochran-Grabel method to calculate time constants, but calculating the low-frequency transfer functions from a defined input source to the output terminal, instead of the resistance seen by the reactive elements.
Transfer constants are shown as H i j k … {\textstyle H^{ijk\ldots }} , where the superscripts i j k … {\textstyle ijk\ldots } , are the indexes of the elements infinite valued in calculation of the transfer constant and the remains elements zero valued. The zeroth order transfer constant H 0 {\textstyle H^{0}} denotes the ratio of the output to input when all elements are zero-valued. H 0 {\textstyle H^{0}} often corresponds to the dc gain of the system.