Case study

Background of the Problem Probes apparently hit to the target, but the data would not be stable.
Measurement Conditions
  • Probe Type ⇒ CP35-A SPS (Spear, Spring Force 210g)
  • Target ⇒ A terminal with a groove on its head

CAUSE

This problem was attributed to low surface quality at the target point on the terminal. In addition, nickel plating on the terminal had been oxidized.

【A rough surface of the groove bottom】

Although the spear tip hit the target, the readings showed unstable. This was attributed to the rough surface at the contact area of the terminal

【A rough surface of the groove bottom】

Although the spear tip hit the target, the readings showed unstable. This was attributed to the rough surface at the contact area of the terminal.

PROBLEM SOLUTION

A multi-diagonal-edged tip will work well for the rough surface on the groove bottom and projections on the surface.
Unlike the spear point tip, it has an enlarged diameter and is shaped with diagonal blades.
These blades can penetrate the oxidized layer on the groove edges, and then lead to stable readings.

※This method demands an accurate contact position. Moreover, a suitable tip can be different depending on surface conditions and the degree of oxidization on the target surface. Consult us if you need our advice.

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