field instrumentation consists of a suite of three magnetometers, two vector fluxgate magnetometers (MAGs) and a single vector search-coil magnetometer (SCM) located on boom extending behind the spacecraft and within the umbra of the PSP thermal protection system (TPS).

The two fluxgate magnetometers, built at Goddard Space Flight Center (GSFC), provide vector measurements of DC and low frequency magnetic fields with a maximum survey sample (Sa) rate of $f_{svy}^{max}$=292.969 Sa/s. These low frequency measurements are accompanied by measurements from the FIELDS SCM low frequency (LF) windings sensitive from $\approx$3 Hz-20 kHz. The SCM sensor $x$-axis additionally contains a second mid-frequency (MF) winding sensitive from $\approx$10 kHz-1 MHz. During the perihelion encounters the SCM is continuously sampled by the DFB typically at $f_{svy}$=292.969 Sa/s, though a maximum rate of 18,750 Sa/s is theoretically possible [@Malaspina2016]. When possible, data is additionally acquired during the aphelion cruise phases at reduced sample rates in accordance with allowed telemetry and spacecraft operations. Burst mode waveforms for the LF or MF are sampled up to a maximum rate of 150 kSa/s by the DFB; the MF channel can be sampled at 1.92 MSa/s by the TDS and incorporated in the spectral products generated by the RFS. 