[K Nagano, Kokeyama]

We found that raw ADC channels have high noise on k1ioo. According to Miyakawa-san, they suspect ADC noise goes up when many cards (not sure how many) are connected on the IO chassis. Actually k1ioo has 4 ADCs, 2 ADCs + 3 BO cards.

We investigated which channels on ADC2 (3rd card) are noisy.

Test points of the most upstream on ADC2 were measured when everything is disconnected from the AA board for the card. Followins channels were noisy and may not be able to be used.
CH0, 1, 2, 4, 6, 8, 9, 23, 31.

They have peaks at 7Hz and its harmonics.