Initial Freq Drift (Bluetooth)

Initial Freq Drift is the frequency drift of the first payload group relative to the frequency reference established on the packet preamble. It isolates the drift that occurs at the start of the payload, before the transmitter has settled.

Three results describe carrier frequency behavior, and they measure different things:

ICFT — the offset of the preamble itself from the nominal channel center frequency. This is a frequency error, not a drift.
Initial Freq Drift — how far the first payload group has moved from that preamble reference.
Max Frequency Drift — the largest movement from the preamble reference anywhere in the packet.

This is a per-burst result. Conformance requires every measured value to meet the limit, so with averaging ON the worst case is tracked in the Max / Min columns of the Results Table.

A limit applies on every LE PHY Physical Layer rate.