The discretization of electrical signals is never perfect. Intime-to-digitalconversion, this manifests as small differences(few ps) of the bin sizes inside the converter that even varies from chip to chip. This imperfection is inherent to any time-to-digital conversion hardware. It is usually not apparent to the user. However, when correlations between two channels are measured on short time scales you might see this as a weak periodic ripple on top of your signal. We reduce the effect of this in the software at the cost of a decrease of the time resolution by 2. This feature is enabled by default. If your application requires time resolution down to the jitter limit, you can disable this feature.