| 摘要 |
PROBLEM TO BE SOLVED: To prevent measuring signals from being processed and stored in a processing system for the measuring signals under a condition beyond a preferred measuring range of a processing system of the measuring signals. SOLUTION: An instrumentation unit comprises a processing system which processes and stores a plurality of channels of detectable signals outputted from a plurality of magnetic sensors as the measuring signals, a monitoring means for the measuring signals which monitors whether each measuring signal falls or not within the preferred measuring range of the processing system for the measuring signals, and a displayed control means which displays that the measuring signals have exceeded the preferred measuring range of the processing system for the measuring signals. |
