Results of Electronic Calibration for both JEM-X Units

At the beginning of every revolution an electronic calibration is
performed to  test the behaviour of all 43 amplifiers that provide
the input signals to the onboard software: 20 Backplane, 11 Cathode,
4 Fast, 4 Slow and 4 Veto. The data is processed in the Revolution
File Pipeline using j_calib_adc, which fits a straight line to the
data from each amplifier. If the offset, slope, null value or 
chi-squared of these fits fall outside the bounds specified in the 
Instrument Model Group table JMXi-ECAL-MOD, then an alert is raised 
in the operations room at ISDC.

Thus far all amplifiers have performed as expected, and no deterioration
in their behaviour has been observed. However, for both units Backplanes
5 and 15 are consistently more noisy, more variable and less linear than
all the other amplifiers. This is not an intrinsic property of the
electronic components themselves, but a result of the electronic environment
around them due to their positions in the onboard circuitry.

Y axis scales are chosen so that all the data from one set of amplifiers
(backplanes, cathodes, fast, slow, veto) share the same scales but
appear in sufficient detail.

Last updated with mission data for revolutions 45 to 861 (JEM-X1)/865 (JEM-X2)
13/11/2009 by Carol Anne Oxborrow



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Results for JEM-X1 All Mission Revolutions

Results for JEM-X12 All Mission Revolutions

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