Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – With auxiliary means to condition stimulus/response signals
Reexamination Certificate
2005-10-18
2005-10-18
Deb, Anjan (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
With auxiliary means to condition stimulus/response signals
C324S650000
Reexamination Certificate
active
06956380
ABSTRACT:
An impedance measuring apparatus comprising an automatic balanced bridge has four numerically controlled oscillators that supply sine-wave signals and cosine-wave signals to the quadrature detector and vector modulator of the narrow-band amplifier inside the automatic balanced bridge. The frequency or phase of the output signals of the four numerically controlled oscillators are updated by numeric control from the outside. The four numerically controlled oscillators of the impedance measuring apparatus are oscillators whose frequency or phase is changed a pre-determined time after they have been controlled from the outside. Furthermore, the impedance measuring apparatus has control means with which the change in the frequency or the phase of the output signals of the four numerically controlled oscillators is synchronized.
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Deb Anjan
Nguyen Hoai-An D.
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