# How to enable Hanning Window
A Hanning window is a mathematical function used in Fast Fourier Transform (FFT) analysis, particularly for vibration data, to minimize spectral leakage. Spectral leakage occurs when a signal is truncated in time, introducing artifacts in the frequency domain due to sharp edges at the signal boundaries. The Hanning window tapers the signal smoothly to zero at both ends, applying a cosine-shaped weighting function. This reduces the discontinuities at the edges, which helps improve the accuracy of frequency representation, especially for non-periodic signals. While it slightly broadens the spectral peaks, it provides a good balance between amplitude accuracy and frequency resolution, making it widely used in vibration analysis.
To enable this function, depending on the protocol version being used, use the following steps:
### Protocol v2 & v3
The Hanning Window needs to be enabled by configuring the device. Using the NEON configurator, in the section related to the data configuration, go over the **Selection** section and choose **Enable Hanning Window** to **Yes**.
### Protocol v4
In Protocol v4 the Hanning Window is always enabled so the user will always received FFTs using the Hanning Window.
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