Between 10:30 and 11:30 UTC, we tested a new feature on EIB-SAS for scattered light investiations that allows to inject a low frequency sine into any of the bench degrees of freedom while the bench loop is closed. Actuation at 0.1 Hz with an amplitude of 5 "um" / "urad" as set in the config file produces the following bench motion:
| Bench DOF | peak-peak motion (um) | Maximum peak-peak actuation voltage (Vpp) |
|---|---|---|
| x | 40 | 3 |
| y | 7 | 0.4 |
| z | 40 | 3 |
| Tx | 8 | 0.3 |
| Ty | 8 | < 0.1 |
| Tz | 7 | 0.3 |
The sine injection can be enabled/disabled from control buttons in the VPM (the higher frequency noise injections were found to not always be stable). The ACL_INFO flags relay_inj_flag and relay_sin_flag indicate in how many degrees of freedom signals are injected, and should be 0 during normal operation.