Patent ID: 9562951
Date: 2017-02-07
CPC Classifications: G01R

Claim:
1. A method comprising: providing a output signal to a unit under test via a first external terminal of a frequency response analyzer; receiving, at a first channel module of the frequency response analyzer, analog data in response to providing the output signal; providing a first synchronization signal to a digital frequency response analyzer (DFRA) of the frequency response analyzer; measuring, at a reference channel module, phase data of the output signal; providing, by the DFRA, a digital command signal based on the first synchronization signal; receiving, at the DFRA, digitized analog data in response to providing the digital commands; correlating the received digitized analog data to the received analog data based on the phase data; and determining transfer function of a plant at the unit under test based on the correlation of the received digitized analog data and the received analog data.