What rating is given when a signal changes to the correct one?

A rating of "Fair" is given when a signal changes to the correct one as it indicates that while the signal has improved and met a necessary threshold, it may not yet be performing optimally. The "Fair" rating signifies that the transition to the correct signal is acknowledged, but there might still be nuances or issues that prevent it from being rated higher, like "Good" or "Excellent." This rating reflects a transitional state, suggesting that there are still areas for improvement before achieving a more favorable evaluation. In contrast, higher ratings would typically indicate more robust performance and stability.