PURPOSE:To make it possible to reduce the number of used low-pass filters by converting a count result into a parallel signal and further converting it into a series signal before leading it out of a shield case. CONSTITUTION:Input signals from input terminal 1 are converted into parallel signals by decade counters 8-11 and further converted in to series signals by shift registers 40-43 before being led out of shield case 20 via low-pass filter 54. Then they are converted again into parallel signals by shift registers 56-59 and displayed by counter display units 16-19 via memory circuits 12-15. Control signals are led out of shield case 20 via low-pass filters 52 and 53. In this way, the number of used filters can be reduced.
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