Galfa Spectrometer Integration Times

August 24, 2004
Dan Werthimer and Jeff Mock


All seven spectrometer boards are synchronized together by the observatory 1 PPS tick and the observatory 100 MHz clock.

Integration time for both the coarse and fine spectrometer is 0.9863168 seconds (860 frames).

A frame is the time for one spectra from the fine spectrometer:

Tframe = Nchannels * decimation / sample_rate
  = 8192 * 14 / 100 MHz
  = 1.146880 ms        

During each integration, 860 fine resolution spectra are added together, and 385280 coarse resolution spectra are added together (860 * 14 * 8192/256 = 385280)

Integration starts 5.734400 ms after the 1 PPS tick (exactly 5 frames after the one second tick).