N5425B InfiniiMax Differential ZIF Probe Head
10
InfiniiMax RC Probe Amplifier and Probe Heads User’s Guide
121
It also matters how the two wells are positioned
relative to each other. When you land the longer wire
first, you will want to land it in a well that is below and
to the right (from the perspective of the probing
direction) relative to the wells in which you are going
to land the short wire. In the diagram above, you could
land the longer wire in well 1 and then probe locations
2, 3, and 4 with the short wire. You could not, however,
reach well 5 with the short wire (the two wires could
cross, shorting them in the process). You also could
not reach well 6 with the short wire due to the
configurations of the wire (this will cause an upward
bend in the wires that could be detrimental to the
probing performance). The short wire wells will always
need to be up and to the left of the long wire well
(from the perspective of the probing direction).
To land both of the wires in the wells, first position the IC under a microscope and
move both wires into the region as shown below.
Figure 68
Wires in Wells
How easy the rest of these steps are will depend on how powerful of a microscope
you have. It may take a while to get adjusted to the process, but with some
practice, you should grow in your comfort level.
Move the positioner in the x-y direction until the tip of the long wire is above its
well. You may not be able to see the wells and the wires in focus at the same time.
If this is the case then first focus on the wells and then slowly move the focus out
until you can see just the tips of the wires. You should then be able to move the
longer wire tip over the first well.
Next, slowly land the tip in its well (using the z-direction adjustment on the
micropositioner). Keep moving down until you see the end of the wire bend
slightly. This will ensure that this wire remains stuck while we translate the shorter
wire in the next step. Do not land the longer wire too hard or you could damage it.
Once you see it flex, stop moving in the z-direction and use the x-y knobs on the
micropositioner to wiggle the longer wire slightly. If the wire wiggles, but stays
stuck in place on the IC then it was properly placed in the well.
1
2
3
4
5
6
Fine Wire ZIF tip
The two pointed shadows
shown in the image to the
left are the 22 micron
wires
