This article introduces simply the composition of the low phase noise OCXO,and analyses the difficulty of the phase noise test. A test installation is established by phase noise measurement system、adapter、and DC power. The phase noise is measured by phase noise measurement system and two low phase noise OCXO that one is as refer source another as DUT,and is computed by revise data. A difficult problem of the phase noise test of low phase noise OCXO is solved. At the same time,the uncertainty of test installation is evaluated. by research and practice,it shows that this calibration installation is simple、reliable、convenientand and practical,and the requirement of dissemination of quantity is fulfilled with it.
Metrology & Measurement Technique