If the scanning duration (also called dwell time) is set to a small value then the adapter will likely miss frames related to the roaming and authentication exchange because it hops away to a different channel before the roam completes. Scanning between channels with a single adapter is not sufficient because the adapter will miss frames transmitted on alternate channels. Be sure to check the supported adapters list for the protocol analyzer software that you intend on using to capture and analyze the traffic. I have had good success with the Rosewill RHB-330 USB hub. In order to perform wireless roaming analysis, you will need multiple wireless adapters to capture frames simultaneously on different channels. The hardware required typically includes 3 wireless adapters and a USB hub. Part 6 - Tips for Roaming Performance Improvement (coming).Part 5 - Analysis with Wildpackets Omnipeek (coming). Part 4 - Analysis with Wireshark and AirPcap.Part 3 - Methods of Measuring Roam Times.
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