Test probe for finger tester and corresponding finger tester
A test probe for a finger tester for the testing of non-componented circuit boards has a test needle with a probe tip which may be brought into contact with a circuit board test point, and which may be pivotably attached to a mount by means of at least two flexible sprung retaining arms. It is distinguished by the fact that at least one of the retaining arms is made of an electrically conductive material and is electrically connected to the test needle. In a corresponding finger tester, the test probe is driven by a linear motor.
1. Test probe for a finger tester for the testing of circuit boards, with no independent drive, the test probe comprising:
a test needle with a probe tip which may be brought into contact with a circuit board test point;
a mount; and
at least two pairs of flexible sprung retaining arms that pivotably attach the test needle to the mount,
wherein at least one of the retaining arms is made of an electrically conductive wire element and is electrically connected to the test needle, and
wherein each pair of retaining arms is mounted in one plane, with one end fixed to the test needle and the other end to the mount, and each pair of retaining arms spanning legs of a triangle having at least a partially open interior when viewed from above.
2. Test probe according to claim 1 , wherein both pairs of retaining arms comprise a retaining arm made of an electrically conductive wire element and are electrically connected to the test needle.
3. Test probe according to claim 2 , wherein the test needle is surrounded by a shield which is electrically connected to one or more of the retaining arms, which is electrically conductive and connected to earth and which pivotably attaches the test needle to the mount.
4. Test probe according to claim 1 , wherein the test needle is surrounded by a shield which is electrically connected to one or more of the retaining arms, which is electrically conductive and connected to ground and which pivotably attaches the test needle to the mount.
5. Test probe according to claim 4 , wherein the retaining arms span the shape of a trapezoid when viewed from the side.
6. Test probe according to claim 5 , wherein the retaining arm or arms which is or are closer to the probe tip is or are longer than the retaining arm(s) which is or are further from the probe tip.
7. Test probe according to claim 1 , wherein the retaining arms span the shape of a trapezoid when viewed from the side.
8. Test probe according to claim 7 , wherein the retaining arm or arms which is or are closer to the probe tip is or are longer than the retaining arm(s) which is or are further from the probe tip.
9. Test probe according to claim 1 , wherein the retaining arms are surrounded, at least in part, by a shield element.
10. Test probe according to claim 1 , wherein a pre-tensioning element is provided to engage and pre-tension the retaining arms against the direction of contacting by a specific amount.
11. Test probe according to claim 1 , wherein a position sensor is provided to determine the position of the test needle relative to the mount.
12. Test probe according to claim 1 , wherein retaining arms are made from wire elements.
13. Test probe according to claim 1 , wherein each pair of retaining arms is made from a wire element that is bent in a middle.
14. Test probe for a finger tester for the testing of circuit boards, comprises a test needle with a probe tip for contacting a circuit board test point, the test needle being attached to a mount by at least two pairs of flexible sprung retaining arms,
wherein at least one of the retaining arms is an electrically conductive wire element and is electrically connected to the test needle, and
wherein each pair of retaining arms is mounted in a different plane, with one end fixed to the test needle and the other end to the mount, and each pair of retaining arms spanning legs of a triangle having at least a partially open interior when viewed from above.
15. Test probe according to claim 14 , wherein both pairs of retaining arms comprise a retaining arm being constructed from an electrically conductive wire element and being electrically connected to the test needle.
16. Test probe according to claim 15 , wherein the test needle is surrounded by a shield which is electrically connected to one or more of the retaining arms, which is electrically conductive and connected to ground and which attaches the test needle to the mount.
17. Test probe according to claim 14 , wherein the retaining arms span the shape of a trapezoid when viewed from the side.
18. Test probe according to claim 14 , wherein the retaining arms are surrounded, at least in part, by a shield element.
19. Test probe according to claim 14 , wherein a pre-tensioning element is provided, to pre-tension the retaining arms against the direction of contacting by a specific amount.
20. Test probe according to claim 14 , wherein a position sensor is provided to determine the position of the test needle relative to the mount.
21. Test probe according to claim 14 , wherein retaining arms are made from wire elements.
22. Test probe according to claim 14 , wherein each pair of retaining arms is made from a wire element that is bent in a middle.