| CPC G01N 27/00 (2013.01) [G01N 33/4836 (2013.01); G06F 11/1675 (2013.01)] | 20 Claims |

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1. An apparatus, comprising:
an electrode array configured to measure input signals of an analog domain through electrodes arranged in a target point;
main signal processors configured to perform signal processing operations on corresponding respective input signals of the input signals;
auxiliary signal processors configured to replace at least one of the main signal processors, and perform at least some of the signal processing operations in response to a replacement condition being satisfied, and
a controller configured to, when a plurality of replacement targets satisfying the replacement condition is detected from the main signal processors, determine a replacement priority of the replacement targets based on a defect level of the replacement targets.
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