order to meet telemetry constraints imposed by the spacecraft. The lower cadence measurements still allow for diagnosis of magnetic noise associated with spacecraft generated magnetic fields. The primary science instrument for the DC magnetic fields is MAGo, which is less sensitive to spacecraft generated fields due to its positioning on the spacecraft boom.

The complex transfer functions associated with the MAGs, shown in Figure \[merging\_resp\](a), are dominated by a single pole low-pass Butterworth filter used for anti-aliasing purposes tuned to -3 dB at the max sample rate Nyquist frequency ($f_{svy}^{Ny}\approx$146.5Hz) [@Acuna2008; @Connerney2015; @Connerney2017]. Due to the low-pass characteristics of the Butterworth transfer function, the MAGs are sensitive to the DC magnetic fields associated with the spacecraft [@Ness1970; @Ness1971; @Belcher1973]. Typically, the minimization of such fields is performed through magnetic control programs [@Ness1970; @Musmann1988]. For PSP a strict magnetic cleanliness program was followed during design and development. Once in space, driven spacecraft maneuvers are used to establish the magnetometer zero offsets relative to the ambient field e.g. [@Acuna2002; @Connerney2015]. However, similar results can be accomplished without controlled maneuvers through statistical analysis of non-compressive Alfvénic rotations in the solar wind [@Belcher1973; @Leinweber2008]. Several multi-sensor techniques to determine sensor zeros have been developed 