GP-B Post-Flight Analysis—Final Report - Gravity Probe B - Stanford ...

Figure 11-5. Local box temperature and detector high signals since launchFigure 11-5 shows a very long time history of the eight detector high signals grouped in pairs below thecorresponding box temperature plot. It is interesting to note that while the four temperature plots are verysimilar, there is some degree of variation in the shape of the detector high levels. In the range of time betweenabout 2500 and 4500 hours, where the temperature tends toward a minimum and then increases smoothly, theshape of the detector highs for the bottom plot in the left column and the second from the top plot in the rightcolumn are quite different in character from the other six detector high plots. The steps in the detector highplots generally occur when an adjustment in the level was made.Table 11-3 below contains a tabulation of when each of the clamp adjustments were made, and the commandvalue to which they were set. Valid command values range from 0 to 255. There were some cases where a valuewas set, and then the system re-initialized for some reason such as an SRE processor re-boot. These resets arenot included in the listing.Gravity Probe B — Post Flight Analysis • Final Report March 2007 315