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The rf fluctuation effects on an uncompensated probe is theoretically and experimentally studied and assuming a Maxwellian distribution and sinusoidal plasma-potential oscillation, the electron temperature is reduced directly from an uncompensated Langmuir probe trace, by taking the natural logarithm of the electron current. This result is again brought to the attention, which shows that under certain discharge conditions it is not necessary to build any rf compensation in a Langmuir probe system.

The effects of electron current on a capacitive sheath are investigated by controlling this current with an additional dc bias on the electrode. The results have shown that the electron power absorption is more effective when the electron current is removed and the theoretical models have also shown a high harmonic content on the sheath voltage that is attenuated by removing the electron current.