mode waveform data, typically captured at a rate of $f_{svy}^{max}=292.969$ Sa/s is sampled and processed by the FIELDS DFB [@Malaspina2016]. In addition to continuous survey mode waveform data, the DFB provides a highly configurable set of operational modes which can be modified in flight to generate a diverse set of burst waveform and spectral data products. In addition to sampling the SCM output, the DFB is designed to inject a programmable calibration signal into the SCM. The response of the SCM to the injected stimulus is captured by the DFB as well as the TDS and the instrumental transfer function can accordingly be determined in-flight.

Figure \[merging\_resp\](b) shows the gain and phase characteristics of the FIELDS SCM $x$-axis which were determined empirically on ground using a spectral analyzer. A complex rational function with 4-poles and 2-zeros: $$R(i\omega) =\frac{A_0+i\omega A_1}{(B_0-B_2\omega^2)+i\omega(B_1-B_3\omega^2)}$$ is fit to the the response using the least square estimation techniques developed by .

The inductive nature of the SCM leads to strong gain and phase shifts in the instrumental response function which must be compensated to obtain an estimate of the observed magnetic field in physical units. During pre-launch integration and testing different methods to invert the SCM frequency 