Advantages
Bead probe can be used in circuits where the pin-pitch is too fine to allow standard test pads. This is becoming more common as pin pitches continue to reduce, particularly in embedded devices. Typically bead probe widths are the width of the PCB traces with a length of about three times this. This allows a high degree of flexibility in their positioning, and can in some cases be applied retrospectively to existing layouts. Because of their small size, bead probes do not affect the signal quality of the signals transferring within the PCB trace. This is especially useful in high speed input/output (HSIO) interconnects, where a standard test pad would interfere with the signal.
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