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AdV-SBE (MultiSAS for SPRB, SDB2, SIB2 commissioning)
bulten, gouaty - 20:55 Tuesday 20 February 2024 (63342) Print this report
SDB2 microspring adjustment
due to the thermal transient, the GAS filter-1 stiffness was higher than nominal and the position of the vertical LVDT was around +3.2 mm. The SBD2 bench was about 1.2 mm above
the nominal value. The locking did not work because the guardian switched on. Romain asked me to adjust the microsprings which I did, and we locked the beam again.

We can set the limits for the guardian a bit wider, since the actuators are strong enough to easily compensate for the 1.2 mm of the bench. Then the loop would have
closed without tripping the guardian. But I prefer to keep the settings as they are;
a thermal transient should typically only occur after some hardware intervention and it is better to check whether both GAS filters are around nominal range than let the actuators
adjust for the thermal gradients. I expect that this manual microspring intervention is not needed during science mode since we do not expect thermal gradients during science mode,
so I do not expect extra downtime due to the tight settings of the guardian.
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