Why does the compressor for the object cooling not start simultaneously with the compressor for the cabinet cooling when switching on the Leica CM1950?
• After turning on the cryostat, the compressor for the cabinet cooling will cool the cabinet down to -5 °C before the second compressor, for object cooling, can be activated. • Activation of object cooling is delayed to ensure that the object head does not cool faster, due to its smaller mass, compared to the rest of the cryostat. This prevents humidity in the chamber from causing frost build up on the object head, which could result in problems clamping the specimen disc.
