| 摘要 |
Apparatus for generating an output dependent upon the impedance or at least one component of the impedance of a device (20), the apparatus comprising: a load component (21) having a known impedance for connection in series with the device (20) to allow for the measurement of a voltage drop across the load component (21); a generator arrangement (22) for applying a voltage across the series connected load component (21) and device (20); a measurement arrangement adapted to measure a first voltage one side of said load component (21), and a second voltage on the other side of said load component (21) or a difference voltage comprising the voltage difference across said load device (21); and a signal processing arrangement for processing the measurements to generate an output dependent upon the impedance of said device; wherein said signal processing arrangement is adapted to monitor said measurements to detect fault conditions in said device and to output a warning output if a fault condition is detected. |
