Maury cryogenic terminations require the user to provide helium gas at about 2 psi to purge the coaxial or waveguide transmission line (connecting the cooled termination to the output connector) of contaminants (air, carbon dioxide, etc.) prior to filling the dewar with liquid nitrogen.
The MT152A pressurizing system is designed to provide proper pressure regulation of the helium supply for stand-alone cryogenic noise terminations. The system consists of a two-stage pressure regulator that is preset to provide 2 to 3 psi output pressure, a safety pressure relief valve set to 4 psi, necessary fittings, and an 8 foot hose to connect the helium supply to the termination.
The MT152C pressurizing system is designed to provide proper pressure regulation of the helium supply to pressurize the cryogenic noise terminations included as components of Maury noise calibration systems. The MT152C system consists of a two-stage pressure regulator with appropriate high and low pressure gauges, an adjustment knob that allows the output pressure to be set from 0 to 20 psi, a safety pop-off valve preset at 25 psi, a line pressure shut off valve, necessary fittings and an 8ft. hose to connect the helium supply to the noise calibration system.
Application Notes and Data Sheets
Technical Data - Model MT152A - Pressurizing System
Technical Data - Model MT152C - Pressurizing System
Application Note - Applications of the Maury Noise Calibration Systems; Accuracy & Convenience in Noise Measurement