Dual tip test probe assembly
A dual tip test probe assembly for use in both cantilever and vertical probe applications includes first and second elongated test probes, each having a body portion and a tip portion with a tip configured to make contact with a device under test. An electrically-insulating material is disposed between but not in contact with the body portions of the first and second elongated test probes to electrically isolate the first and second elongated test probes. The first and second elongated test probes are held in alignment with respect to each other so that the tip of the first elongated test probe is adjacent to and not in contact with the tip of the second elongated test probe for making simultaneous contact with the device under test. The dual tip test probe assembly provides a low inductance and a small, stable footprint for testing small and/or non-flat test points.
1. A test probe assembly comprising:
a first elongated test probe having at least a curved body portion and a tip portion with a tip configured to make contact with a device under test;
a second elongated test probe having at least a curved body portion and a tip portion with a tip configured to make contact with the device under test; and
an electrically-insulating material disposed between and in contact with the curved body portion of the first elongated test probe and the curved body portion of the second elongated test probe to electrically insulate the first elongated test probe from the second elongated test probe,
wherein the first elongated test probe and the second elongated test probe are held in alignment with respect to each other so that the curved body portion of the first elongated test probe is aligned in the same direction as the curved body portion of the second elongated test probe and so that the tip of the first elongated test probe is adjacent to but not in contact with the tip of the second elongated test probe for making simultaneous contact with the device under test.
2. The test probe assembly as recited in claim 1 , wherein:
the curved body portion of the first elongated test probe includes a flat surface,
the curved body portion of the second elongated test probe includes a flat surface, and
the electrically-insulating material is disposed between and in contact with the flat surface of the curved body portion of the first elongated test probe and the flat surface of the curved body portion of the second elongated test probe.
3. The test probe assembly as recited in claim 2 , wherein:
the curved body portion of the first elongated test probe at the flat surface is generally semicircular in shape, and
the curved body portion of the second elongated test probe at the flat surface is generally semicircular in shape.
4. The test probe assembly as recited in claim 1 , wherein both the tip portion of the first elongated test probe and the tip portion of the second elongated test probe are tapered.
5. The test probe assembly as recited in claim 1 , wherein the tip of the first elongated test probe and the tip of second elongated test probe are rectangular in shape.
6. The test probe assembly as recited in claim 1 , wherein the tip of the first elongated test probe and the tip of second elongated test probe are semiconical in shape.
7. The test probe assembly as recited in claim 1 , wherein the tip portion of the first elongated test probe and the tip portion of second elongated test probe are both bent for cantilever probe applications.
8. The test probe assembly as recited in claim 1 , wherein:
the first elongated test probe includes a first end and a second end,
the tip portion of the first elongated test probe is at the first end of the first elongated test probe,
the first elongated test probe includes a tail portion at the second end of the first elongated test probe,
the second elongated test probe includes a first end and a second end,
the tip portion of the second elongated test probe is at the first end of the second elongated test probe,
the second elongated test probe includes a tail portion at the second end of the second elongated test probe, and
the second end of the first elongated test probe and the second end of the second elongated test probe are shaped so that a distance between the tail portion of the second end of the first elongated test probe and the tail portion of the second end of the second elongated test probe is greater than a distance between the curved body portion of the first elongated test probe and the curved body portion of the second elongated test probe.
9. The test probe assembly as recited in claim 1 , further comprising one or more retaining members configured to hold the first and second elongated test probes in position with respect to each other.
10. The test probe assembly as recited in claim 9 , wherein the one or more retaining members are one or more retaining rings around the first and second elongated test probes.
11. The test probe assembly as recited in claim 8 , wherein a cross sectional area of the tail portion of the second end of the first elongated test probe is less than a cross sectional area of the curved body portion of the first elongated test probe and a cross sectional area of the tail portion of the second end of the second elongated test probe is less than a cross sectional area of the curved body portion of the second elongated test probe.
12. The test probe assembly as recited in claim 8 , wherein the electrically-insulating material is not disposed between the tail portion of the second end of the first elongated test probe and the tail portion of the second end of the second elongated test probe.
13. The test probe assembly as recited in claim 1 , wherein the electrically-insulating material is a polyamide material.
14. The test probe assembly as recited in claim 1 , wherein the electrically-insulating material is not disposed in between the tip portion of the first elongated test probe and the tip portion of the second elongated test probe.
15. The test probe assembly as recited in claim 1 , further comprising one or more shims disposed between the first elongated test probe and the second elongated test probe.