| 摘要 |
PURPOSE:To make it possible to specify an abnormal channel measuring system through simultaneous and automatic check of many channel measuring systems by installing a check signal generating module and a switch controller to generate a switching control signal and a group of holding circuits which temporarily hold a check signal inputted from an input change-over switch. CONSTITUTION:When a switching control signal is outputted from a switch controller 11, each input change-over switch 13 simultaneously selects the output side of a check signal generating module. When a check signal is outputted under this condition, results of measurement of a plurality of channel measuring systems are simultaneously held by the holding circuits 14 and 16 for the respective channels through the respective input change-over switches 13. The signals of the results of measurement are converted into digital signals in order, and then, stored in a memory 19. And an abnormal channel measuring system is decided from the relation between preset check signals and the results of measurement, and the decision is displayed. Thereby, many channel measuring systems are almost simultaneously and automatically checked so that it is possible to detect an abnormality of the channel measuring system and also specify in place the abnormal channel measuring system.
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