Although the effectiveness of fluidic oscillators as flow control actuators is well known, a lack of knowledge regarding their internal mechanisms and external dynamics persists. Due to their commonly small size and high oscillation frequency, time-resolved measurements are challenging. In this study an enlarged fluidic oscillator made out of acrylic glass and supplied with air under pressure is investigated experimentally. Combined with a highspeed PIV system and time-resolved pressure measurements inside the fluidic oscillator, high temporal resolution is accomplished. The results reveal the underlying mechanism causing the jet to oscillate. The knowledge of the internal dynamics allows an educated improvement and optimization of the oscillator’s design. Several properties (eg, deflection angle, jet width, jet velocity, and entrainment) of the oscillating jet, which is emitted into a quiescent environment, are examined. Results show that the jet’s characteristics are only independent of the supply rate within a limited range. Although well within the incompressible regime, the jet’s oscillation pattern changes at higher supply rates. The time-resolved flow field infers that the oscillating jet resides longer in its deflected state than it takes to switch over to the other side. Throughout one oscillation cycle the jet’s properties are also found to oscillate substantially which may be of significance for various applications. A comparison with a free axisymmetric jet reveals that the oscillating jet entrains more fluid. This behavior is accompanied by a faster decrease in jet velocity and increase in jet width.