The purpose of this investigation is to find out whether or not the SQZ TEC servos needs to be switched off during venting (and then possibly to update M1300464).
Attached are pictures of sections in which all servos were switched off and once where all were on during venting.
The area between -19.5d and -15.5d from t0=Sun Sep 25 2022 13:13:15 UTC was selected for all servos are off and -11.5d to +1.5d from t0= Fri Jan 26 2024 20:34:02 UTC for all servos are on.
Picture structure
The images are named as follows:
- All servos on during venting and shows the temperatures: all_on_temperature
- All servos off during venting and shows the temperatures: all_off_ temperature
- All servos on during venting and shows the temperatures and zoomed into an interesting area: all_on_temperature_zoom
- (the same for readback)
The pictures are structured as followed:
| H1:SQZ-XXX_TEC_LOOP_SWITCH | H1:SQZ-XXX_TEC_THERMISTOR_TEMPERATURE | H1:SQZ-XXX_TEC_THERMISTOR_2_TEMPERATURE | H1:SQZ-XXX_TEC_THERMISTOR_1_TEMPERATURE | ||
| XXX = OPO | H1:SQZ-OPO_TEC_LOOP_SWITCH | H1:SQZ-OPO_TEC_THERMISTOR_TEMPERATURE | H1:SQZ-OPO_TEC_THERMISTOR_TEMPERATURE | H1:SQZ-OPO_TEC_THERMISTOR_TEMPERATURE | H0:VAC-LY_HAM7_PT153_MOD2_PRESS_TORR |
| XXX = SFI1 | |||||
| XXX = SFI2 | |||||
| XXX = OFI |
| H1:SQZ-XXX_TEC_LOOP_SWITCH | H1:SQZ-XXX_TEC_VOLTAGEBACK | H1:SQZ-XXX_TEC_CURRENTBACK | H1:SQZ-XXX_TEC_POWERBACK | H1:SQZ-XXX_TEC_VOLTSOUT | H1:SQZ-XXX_TEC_CONTROLSIG | ||
| XXX = OPO | H0:VAC-LY_HAM7_PT153_MOD2_PRESS_TORR | ||||||
| XXX = SFI1 | |||||||
| XXX = SFI2 | |||||||
| XXX = OFI |
Result
Temperature does not change during venting, which means from this point of view it does not need to be switched off.
Whereas the readback senses venting. Most have only minimal changes in voltage of max 0.2V but a few have larger changes:
| Servo on | Servo off | |Servo on - Servo off| | ||
| H1:SQZ-OPO_TEC_VOLTAGEBACK [V] | 0.1 | 0.7 | 0.6 | Servo on < Servo off |
| H1:SQZ-OPO_TEC_VOLTSOUT [V] | 0.1 | 0.85 | 0.7 | Servo on < Servo off |
| H1:SQZ-SFI1_TEC_VOLTSOUT [V] | 0.6 | 0.35 | 0.25 | Servo on > Servo off |
| H1:SQZ-SFI2_TEC_VOLTSOUT [V] | 0.7 | 0.3 | 0.4 | Servo on > Servo off |
| H1:SQZ-OFI_TEC_VOLTAGEBACK [V] | 0.6 | 0.3 | 0.3 | Servo on > Servo off |
| H1:SQZ-OFI_TEC_VOLTSOUT [V] | 1.6 | 0.7 | 0.9 | Servo on > Servo off |
Attached is a plot of OFI with the pressure analysis as the venting in this chamber was earlier.
