# Results and Uncertainties

The measurement uncertainties of the arrangement simulated by the PowTrans originates from two sources:

1. The source and load mismatches.

2. Finite directivity of the directional couplers used for sampling the level of the incident and reflected powers in the main transmission line.

The simulated results and uncertainties are displayed in various forms in the tabbed container at the bottom of the main program window. The data are logically grouped into three pages: Transmission, Power Meas, and Load Meas.