Magnetometer on spacecraft appears to stop reporting sane values after some time

[khavernathy]

We've noticed for several days with several tests that the spacecraft's magnetometer reports expected values based on rotation of the spacecraft for a long time, but eventually the magnetometer stops reporting sane values (non-oscillating even though the spacecraft is clearly rotating around).

We are outputting the value of SC[0].AC.MAG[0].Field (and [1], [2]) to file and plotting it during the sim. (left graph here).

Any hints on this behavior? Maybe a specific magnetometer setting in Inp_Sim.txt or the Spacecraft input?

We're using this

*************************** Magnetometer ********************************
3                             ! Number of Magnetometer Axes
============================== Axis 0 ===================================
0.1                           ! Sample Time,sec
1.0  0.0  0.0                 ! Axis expressed in Body Frame
60.0E-6                       ! Saturation, Tesla
0.0                           ! Scale Factor Error, ppm
1.0E-8                        ! Quantization, Tesla 
4.6E-7                        ! Noise, Tesla RMS  (4.6 mgauss)
0                             ! Node
============================== Axis 1 ===================================
0.1                           ! Sample Time,sec
0.0  1.0  0.0                 ! Axis expressed in Body Frame
60.0E-6                       ! Saturation, Tesla
0.0                           ! Scale Factor Error, ppm
1.0E-8                        ! Quantization, Tesla 
4.6E-7                        ! Noise, Tesla RMS
0                             ! Node
============================== Axis 2 ===================================
0.1                           ! Sample Time,sec
0.0  0.0  1.0                 ! Axis expressed in Body Frame
60.0E-6                       ! Saturation, Tesla
0.0                           ! Scale Factor Error, ppm
1.0E-8                        ! Quantization, Tesla 
4.6E-7                        ! Noise, Tesla RMS
0                             ! Node

[khavernathy]

We chalked this up to expected behavior... If the gyrometer center of mass is the same as the spacecraft and the magnetic field vector aligns with the angular momentum vector it makes sense. I think that's all that was happening.