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Using Display to Assess the Data Quality


There is a program available on arthur called display which provides some online assessment of the data being recorded by the search digitiser. It is invoked by simply typing display on arthur while the search software is recording data. Three of the more useful commands are:

fft: does an online fft, showing up any strong low DM pulsars and any interfering signals which may include the mains power at 50 and 100 Hz and their harmonics.

stats: shows the levels on the filter bank channels averaged over time. If everything is working well, the mean should be around 0.5. Note that the first channel does not record data and will often have a lower level.

time: shows the mean, min, max and rms signal levels as a function of time.

Jon Bell
Sun Aug 17 17:32:08 BST 1997