Since some days I have trouble doing low temperature measurements. I can perform measurements at room temperature without any troubles (for example measuring IdVg curves of a transistor). When I am then cooling down (with risen needles) I am suddenly not able to contact the device again with my needles. Problems start between 150K and 200K at higher temperatures I have no problem, at lower temperatures contacting is really hard. I have the feeling, that when I scratch a bit with the needles, it is possible to get a contact (some measurements are working, some are not). Does someone has similar experiences or any idea what could go wrong?
Post by Lake Shore Jeff M on Jul 8, 2019 8:11:01 GMT -5
The proper operation for landing a probe tip is to skate the tip on the pad. The amount of skate is one of the most important parts of the protocol. More skate provides more wiping to clean away oxidation and more pressure to increase actual contact area. Too much skate will damage the probe tip.
You should find a "Landing the Probe" procedure in the user manual of the probe station you have. If not, please tell me which probe station model you have and what tip you are using and I will help with the procedure.