Quantum model
LNF-VTL_WR28A is a precision cryogenic noise source with very high accuracy. It is based on a variable temperature waveguide termination with a WR-28 port. The termination consists of a crystal quartz chip with a resistive film, a 50 Ohm heater resistor, and a precision temperature sensor. The chip is thermally isolated from the module and can be heated with minimal influence on the waveguide block temperature. However, proper grounding of incoming wires to the base temperature is essential. The block must be cooled down to 50 K or lower to ensure functionality. The temperature sensor is a Lakeshore DT-670A1 series, requiring a suitable temperature monitor to supply a constant current of 10 μA and display the temperature. A temperature regulator is typically used for monitoring and regulating temperature by applying a voltage to the heater resistor.
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