| US 7,548,819 B2 | ||
| Signal measurement and processing method and apparatus | ||
| Ian Slothers, Norfolk (United Kingdom); and Andrew Langley, Dorset (United Kingdom) | ||
| Assigned to Ultra Electronics Limited, Middlesex (United Kingdom) | ||
| Filed on Feb. 27, 2004, as Appl. No. 10/787,251. | ||
| Prior Publication US 2005/0192765 A1, Sep. 01, 2005 | ||
| Int. Cl. G01R 15/00 (2006.01); G01R 27/00 (2006.01) | ||
| U.S. Cl. 702—57 [324/207.16; 324/426; 702/65; 340/538.15; 361/38] | 75 Claims |
| 1. Apparatus for generating an output dependent upon the impedance or at least one component of the impedance of a device,
the apparatus comprising:
a load component having a known impedance or at least one component thereof for connection in series with said device;
a signal generating arrangement for generating a time-varying electrical signal for application to the series connected load
component and device;
a measurement channel for measuring voltages;
a switch arrangement connected to said measurement channel for switching the measurement channel to sequentially measure a
first voltage on a first side of said load component, and a voltage difference between said first side and a second side of
said load component; and
a processing arrangement connected to said measurement channel for processing the sequentially measured voltages to generate
an output dependent upon said impedance or said at least one component of impedance of said device.
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