Page 107 of Product Catalog by Maury Microwave

precision measurement equipment cryogenic termination accessories helium pressurizing system mt152a maury cryogenic terminations must be supplied with helium gas at about 2 psi to purge contaminants air carbon dioxide etc from the coaxial or waveguide transmission line connecting the cooled termination to the output connector before the dewar is filled with liquid nitrogen the mt152a regulates the helium supply by use of a two-stage pressure regulator preset to provide 2 to 3 psi output pressure and a safety pressure relief valve set to 4 psi these are included with an 8 foot hose and the fittings needed to connect your helium supply to the termination mt152a power adapter mt154a the mt154a power adapter is used to convert 50/60 hz power at 230 vac for use by devices requiring 115 vac typical application is to provide power for the 115 vac heater circuit used in the maury cryogenic terminations when the main supply is 220/240 vac the power adapter is rated at 200 va output mt154a calibrated adapters sets maury offers a wide range of calibrated adapters and adapter sets that are used with the mt7118j cryogenic termination and the mt7108b thermal termination to adapt the precision 7mm output port to other coaxial series or to waveguide at specific frequencies they are calibrated for vswr and insertion loss to allow their input noise temperature to be calculated the chart at right lists the available models and sets these are also available separately however since the use of adapters affects measurement accuracy and limits stability or repeatability in waveguide applications better accuracy is achieved and operation of the termination is simpler when they are purchased and calibrated with your instrument maury recommends purchase of your instrument with the connector type or waveguide flange needed maury also offers cryogenic and thermal terminations calibrated at user-specified or standard frequencies please consult our sales department for more information key literature ­ maury data sheet 4a-008a maury model connector type description 2606m 8022m 2607m r299e e229d f229d type n 3.5mm gr900 wr430 wr229 wr159 one 1 each female and male adapter calibrated at 3.95 7.5 12.4 and 18.0 ghz 1 one 1 each female and male adapter calibrated at 3.95 7.5 12.4 and 18.0 ghz one 1 adapter calibrated at 3.95 7.5 12.4 and 18.0 ghz 1 h229d wr112 x229d m229d p229d wr90 wr75 wr62 one 1 waveguide to 7mm end launch adapter h229d wr112 1 see page 119 for the vswr microwave 95 precision measurement equipment

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