Post by Professor Lake Shore on Jan 31, 2017 17:00:15 GMT -5
Why do I have to lift and re-land a probe tip with every temperature change?
If you’re not using ZN50-CVT probes (which are specially designed to flex and compensate for variable temperature changes and adjust for probe travel during sample measurements), lifting a probe tip and re-landing the tip once a temperature settles is necessary during temperature cycling because you need to account for probe tip movement caused by the probe arm expanding as the sample stage warms. Significant ramping of sample stage temperatures may result in contact quality changes during device measurements, possibly shifting the tip enough to leave its contact pad. How much movement depends on the amount of change in temperature. When warming from 4.2 K to room temperature, standard probe tip movement can be as much as 400 μm. Therefore, to ensure more reliable continuous variable temperature measurements, the ZN50-CVT probes from Lake Shore should be used. When landed properly and used with proper contact pads, these CVT probes virtually eliminate the inconvenience of material contraction issues due to temperature changes.