Analysis of Vector Network Analyzer Thermal Drift Error

Ensuring a high accuracy when measuring the parameters of devices under testing is an important task conducting research in terahertz-frequency range. The purpose this paper practical study thermal drift errors vector network analyzer using low-terahertz-frequency extender modules. For this, change measurement error, which function time, was analysed system, based on Keysight N5247B and covering frequency ranges 220–330 GHz, 500–750 750–1100 GHz. results our experiment showed that error decreased rapidly during first half hour warm-up stabilized by 3 h after turning equipment. These allow for estimation necessary time depending requirements measurement’s accuracy. This makes it possible to optimize reduce its duration.