Low magnitude plasma current measurements by conventional Rogowski coils are susceptible to error induced by electrostatic pickup in a radio frequency (RF) environment. This paper highlights and provides a remedy for the various sources of errors encountered in low plasma current measurements performed with traditional Rogowski coil designs. A comparative study of most commonly used coil designs is done with respect to their capacitive pickup rejection, and a simple technique is developed to measure current less than 50 A, with minimum possible error, in our experimental conditions. In our coil design, elimination of electrostatic pickup due to unbalanced currents and voltage fluctuations in close proximity to the coil is carried out by the coil system itself, hence distinguishing it from the usual double coil arrangement and evading the use of cumbersome balun transformers and expensive differential amplifiers. For absolute calibration, magnetic field fluctuations are produced separately in a well-defined transient current configuration. An instrumentation scheme for the integrator circuitry is also attempted to enhance the impunity of this diagnostics to the noise in the radio frequency environment. The application of the designed Rogowski coil system leads to a proper, successful and novel measurement of a low magnitude (25–140 A) plasma current, driven by wave-induced helicity of helicon waves, in our toroidal helicon plasma device. The error in measurement of the low plasma current using conventional Rogowski coil designs, in the RF environment, is reduced from −15 dB to −45 dB by application of our proposed modifications in the Rogowski coil design.