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: http://www.naic.edu/~phil/hardware/galfa/cablsw_may05.html
Дата изменения: Thu Mar 27 23:51:21 2008 Дата индексирования: Sun Apr 13 01:44:53 2008 Кодировка: Поисковые слова: п п п п п п п п п |
The cables for pixel4a and pixel6a (count from 0) from the distribution amplifiers in the receiver room to the galfa spectrometer were switched sometime in early may05 (or late apr05). This meant that when looking at the data offline:
Continuum sources drift/move through the alfa beams
at different times since the beams point at different locations in the
sky. 600 second total power scans showed that pixel 6a and pixel
4b had continuum sources moving through the beams at the same time (6b
and 4a also showed this). The last "good" data set that showed know cable
switch was 12dec05. The next data set available after this was 02may05.
The second data set showed the cables being switched (i didn't find any
data between these two dates to test).
The plots show the total
power drifts versus time after and before the switch (.ps) (.pdf).
Each pixel is plotted in a different color. For each color there are two
strips: polA and then polB over plotted: