david.barker@LIGO.ORG - posted 10:22, Wednesday 29 October 2025 (87830)
Wed CP1 Fill
Wed Oct 29 10:05:17 2025 INFO: Fill completed in 5min 13secs
Images attached to this report
Wed Oct 29 10:05:17 2025 INFO: Fill completed in 5min 13secs
Relock required an initial alignment, and then there was usual ringup that started near the end of the locking sequence. I had to turn on high gain ASC to damp it down. I used SEI_ENV to do it by going to manual, requesting high ASC state, then once we were at NLN going back to auto and letting it go out of that state on its own to recover the ASC.
Observing at 1558UTC.
Tuesday morning the Geist 1250 CDS computer rack environment monitor unit at EY was found to be stuck at its last value as of 04:53 Sunday 26oct2025. Erik found the front panel display as showing these last values, and the ethernet link light was flashing rapidly. The unit (env-ey-1) could not be pinged. Erik power cycled the unit and it came back in an operational state.
This unit failed again at 01:15 Wed 29oct2025 after having ran for about 17 hours.
Note that to show future sensor failure yesterday I made a change the the MEDM screens to show the STATUS PV as a warning color (see attached)
TITLE: 10/29 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Aligning
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 11mph Gusts, 7mph 3min avg
Primary useism: 0.14 μm/s
Secondary useism: 0.65 μm/s
QUICK SUMMARY: Lost lock from a pair of earthquakes off the Oregon coast, ending a 13 hour lock. Running initial alignment now. Other than a dust alarm in the optics lab, no other alarms. Secondary useism is up overnight. Hopefully it wont be an issue, but its getting close to that point.
(Jordan V., Gerardo M.)
Connected valves to be able to pump down the CP1 LN2 fill line, we started with 26 micron of pressure and we pumped down on the system with a scroll pump for most of the maintenance period, we stopped the pump down of the fill line at around 11:45 AM with pressure down to 4 micron. Both valves were closed before turning off the scroll pump. Hoses, adapter and valves remain connected, we intent to visit this item next week again.
Today all hardware used to pump down the fill line was removed, initial reading was that of 3 microns, but after all the items were removed the reported internal pressure went up to 7 microns. We'll take another reading next Tuesday.
TITLE: 10/29 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 148Mpc
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY:
Observing at 151 Mpc and have been Locked for 4.5 hours. Relocking today after maintenance was a bit strange, with two locklosses right after passing through CLOSE_BEAM_DIVERTERS. After the second attempt ended in a lockloss, during our third relocking attempt, we got stuck in PREP_DC_READOUT_TRANSITION for a bit until we discovered that the changes to the OMC whitening gain changes that had been happening as we lost lock hadn't been reverted (87813). We fixed that and continued to LASER_NOISE_SUPPRESSION, where we sat for a longer amount of time than it would have normally taken us to get up to where we lost lock the last two times. While waiting, we encountered the 1 Hz ringup again (seen during the previous two locking attempts as well), and turned on the hi asc gains to combat it. We eventually stepped up to ADS_TO_CAMERAS, then were able to turn off the hi asc gains without it ringing up again. We stepped one-by-one through the net few guardian states, waiting for a lockloss, which ended up not happening! Everything looked good so we went into Observing.
We don't know what was causing those two locklosses, but at the very least I looked through the logs and found that they didn't happen at the same spot in the locking sequence, so that rules out anything from OMC_WHITENING (and obviously CLOSE_BEAM_DIVERTERS) (first lockloss log, second lockloss log).
LOG:
23:30UTC Attempting relock #3 after maintenance day
- Paused in LASER_NOISE_SUPPRESSION
- Turned on hi gains because of 1Hz ringup
- Turned off hi gains
- 1 Hz started ringing up, turned hi gains back on
- Stepped to ADS_TO_CAMERAS
- Once ADS_TO_CAMERAS was done, turned hi gains off to see if we still had the ringup
- Stepped through the rest of the states one at a time, no locklosses
00:28 NOMINAL_LOW_NOISE
00:29 Observing
[Jennie, Elenna, Oli, Keita, MattT, Jenne]
One of our locklosses this afternoon happens to have been while the OMC DCPD whitening was switching (reason is under separate investigation). It happens that the gains we use for these now are the A0 and B0 gains, in filter banks on the IOPOMC0 model, not the OMC model. The IOPOMC0 model is not part of the SDF revert process (probably because we never thought to add it in?). This means that upon relock, the OMC guardian was confused when it was asked to do the SET_WHITENING state and it found that the gains were 0 or 2, not 1 and 1.
The OMC guardian's DOWN state had an old comment (from before the omc0 days) where we explicitly set DCPD_A_GAIN and DCPD_B_GAIN both to 1, in case we lose lock during a whitening switch. For now (and in case we decide we don't want to add IOPOMC0 to the sdf revert list) I've added lines to also set DCPD_A0_GAIN and DCPD_B0_GAIN both to 1. Hopefully we won't get stuck on this small little piece again, and can get back to figuring out our bigger locking issues.
[Fil, Jonathan, Ej, Erik]
Two previously unused pairs of optical fiber between EY and the Corner station were extended from patch panels to the computer racks in EY and the MSR.
Two computers were setup on either end to test Ethernet throughput and reliability, lr-eth-c in the MSR and lr-eth-e and EY. Each computer had a Intel e810 with 100g SFP and an NVidia Mellanox with 25g/10g SFP.
The first pair tested did not produce a link light.
The second pair was able to push 80g on the Intel card and 25g on the NVidia card, with no lost data but with a low rate of correctable errors on the EY card.
In an attempt to lower that error rate, we swapped the extension fiber at EY from the first (failed) fiber pair to the second, and cleaned it multiple times. This in fact raised the correctable error rate, but it's still operating with no data losses.
With Jumbo frames configured these are the iper3 results on the 100Gig (Intel E810):
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-60.00 sec 168 GBytes 24.0 Gbits/sec 5 sender
[ 5] 0.00-60.00 sec 168 GBytes 24.0 Gbits/sec receiver
[ 7] 0.00-60.00 sec 206 GBytes 29.5 Gbits/sec 9 sender
[ 7] 0.00-60.00 sec 206 GBytes 29.5 Gbits/sec receiver
[ 9] 0.00-60.00 sec 188 GBytes 26.8 Gbits/sec 4 sender
[ 9] 0.00-60.00 sec 188 GBytes 26.8 Gbits/sec receiver
[SUM] 0.00-60.00 sec 561 GBytes 80.3 Gbits/sec 18 sender
[SUM] 0.00-60.00 sec 561 GBytes 80.3 Gbits/sec receiver
For the 25 Gig real time testing we are getting a round trip time (mean) of 50.1 us. In the state we left it at the end of today there are some error counters ticking, but no lost packets.
controls@lr-eth-e:$ sudo ethtool -S ens4f0np0 | grep err
rx_crc_errors_phy: 5
rx_in_range_len_errors_phy: 0
rx_symbol_err_phy: 4
tx_errors_phy: 0
rx_pcs_symbol_err_phy: 4
rx_err_lane_0_phy: 474801
TITLE: 10/28 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Preventive Maintenance
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 12mph Gusts, 7mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.28 μm/s
QUICK SUMMARY:
Attempting to relock again and trying to figure out why we just had two locklosses directly after CLOSE_BEAM_DIVERTERS/start of OMC_WHITENING.
00:29UTC Back to Observing
WP 12844
ECR E2400330
Modified List T2500232
The following SUS SAT Amps were upgraded per ECR E2400330. Modification improves the whitening stage to reduce ADC noise from 0.05 to 10 Hz.
| Suspension | Old | New | OSEM |
| MC1 M2 | S1100182 | S1100148 | ULLLURLR |
| MC1 M3 | S1100176 | S1100135 | ULLLURLR |
| MC3 M2 | S1100069 | S1100106 | ULLLURLR |
| MC3 M3 | S1100123 | S1100093 | ULLLURLR |
| PR3 M2 | S1100063 | S1000274 | ULLLURLR |
| PR3 M3 | S1100113 | S1000277 | ULLLURLR |
| MC2 M2 | S1100110 | S1100169 | ULLLURLR |
| MC2 M3 | S1000294 | S1100174 | ULLLURLR |
| SR3 M2 | S1100105 | S1100146 | ULLLURLR |
| SR3 M3 | S1100074 | S1100134 | ULLLURLR |
F. Clara, J. Kissel, O. Patane
Here's the characterization data and fit results for S1100148, assigned to MC1 M2's ULLLURLR OSEMs.
This sat amp is a UK 4CH sat amp, D0900900 / D0901284. The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 1 of the Measurement Diagrams from LHO:86807.
The data was processed and fit using ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
plotresponse_S1100148_MC1_M2_ULLLURLR_20251020.m
Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are:
| Optic | Stage | Serial_Number | Channel_Number | OSEM_Name | Zero_Pole_Hz | R_TIA_kOhm | Foton_Design |
|---|---|---|---|---|---|---|---|
| MC1 | M2 | S1100148 | CH1 | UL | 0.0949:5.19 | 120.3 | zpk([5.19],[0.0949],1,"n") |
| CH2 | LL | 0.0961:5.24 | 120.5 | zpk([5.24],[0.0961],1,"n") | |||
| CH3 | UR | 0.0962:5.25 | 120.5 | zpk([5.25],[0.0962],1,"n") | |||
| CH4 | LR | 0.0967:5.27 | 120.375 | zpk([5.27],[0.0967],1,"n") |
The attached plot and machine readable .txt file version of the above table are also found in ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/
2025-10-20_UKSatAmp_S1100148_D0901284-v5_fitresults.txt
Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), Jeff nudged the transimpedance a bit to get the magnitude scale within the ~0.25%, shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from G2501621, a la what was done for PR3 and SR3 top masses in LHO:86222 and LHO:84531 respectively.
Here's the characterization data and fit results for S1100135, assigned to MC1 M3's ULLLURLR OSEMs.
This sat amp is a UK 4CH sat amp, D0900900 / D0901284. The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 1 of the Measurement Diagrams from LHO:86807.
The data was processed and fit using ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
plotresponse_S1100135_MC1_M3_ULLLURLR_20251020.m
Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are:
| Optic | Stage | Serial_Number | Channel_Number | OSEM_Name | Zero_Pole_Hz | R_TIA_kOhm | Foton_Design |
|---|---|---|---|---|---|---|---|
| MC1 | M3 | S1100135 | CH1 | UL | 0.0955:5.21 | 120.25 | zpk([5.21],[0.0955],1,"n") |
| CH2 | LL | 0.0962:5.25 | 120.25 | zpk([5.25],[0.0962],1,"n") | |||
| CH3 | UR | 0.0973:5.31 | 120.125 | zpk([5.31],[0.0973],1,"n") | |||
| CH4 | LR | 0.097:5.3 | 120.125 | zpk([5.3],[0.097],1,"n") |
The attached plot and machine readable .txt file version of the above table are also found in ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/
2025-10-20_UKSatAmp_S1100135_D0901284-v5_fitresults.txt
Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), Jeff nudged the transimpedance a bit to get the magnitude scale within the ~0.25%, shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from G2501621, a la what was done for PR3 and SR3 top masses in LHO:86222 and LHO:84531 respectively.
Here's the characterization data and fit results for S1100106, assigned to MC3 M2's ULLLURLR OSEMs.
This sat amp is a UK 4CH sat amp, D0900900 / D0901284. The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 1 of the Measurement Diagrams from LHO:86807.
The data was processed and fit using ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
plotresponse_S1100106_MC3_M2_ULLLURLR_20251020.m
Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are:
| Optic | Stage | Serial_Number | Channel_Number | OSEM_Name | Zero_Pole_Hz | R_TIA_kOhm | Foton_Design |
|---|---|---|---|---|---|---|---|
| MC3 | M2 | S1100106 | CH1 | UL | 0.0978:5.34 | 120.25 | zpk([5.34],[0.0978],1,"n") |
| CH2 | LL | 0.096:5.24 | 120.5 | zpk([5.24],[0.096],1,"n") | |||
| CH3 | UR | 0.0973:5.32 | 120.125 | zpk([5.32],[0.0973],1,"n") | |||
| CH4 | LR | 0.0955:5.21 | 120.5 | zpk([5.21],[0.0955],1,"n") |
The attached plot and machine readable .txt file version of the above table are also found in ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/
2025-10-20_UKSatAmp_S1100106_D0901284-v5_fitresults.txt
Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), Jeff nudged the transimpedance a bit to get the magnitude scale within the ~0.25%, shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from G2501621, a la what was done for PR3 and SR3 top masses in LHO:86222 and LHO:84531 respectively.
Here's the characterization data and fit results for S1100093, assigned to MC3 M3's ULLLURLR OSEMs.
This sat amp is a UK 4CH sat amp, D0900900 / D0901284. The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 1 of the Measurement Diagrams from LHO:86807.
The data was processed and fit using ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
plotresponse_S1100093_MC3_M3_ULLLURLR_20251020.m
Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are:
| Optic | Stage | Serial_Number | Channel_Number | OSEM_Name | Zero_Pole_Hz | R_TIA_kOhm | Foton_Design |
|---|---|---|---|---|---|---|---|
| MC3 | M3 | S1100093 | CH1 | UL | 0.0966:5.28 | 120.0 | zpk([5.28],[0.0966],1,"n") |
| CH2 | LL | 0.099:5.4 | 120.375 | zpk([5.4],[0.099],1,"n") | |||
| CH3 | UR | 0.0969:5.3 | 120.0 | zpk([5.3],[0.0969],1,"n") | |||
| CH4 | LR | 0.0966:5.28 | 120.125 | zpk([5.28],[0.0966],1,"n") |
The attached plot and machine readable .txt file version of the above table are also found in ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/
2025-10-20_UKSatAmp_S1100093_D0901284-v5_fitresults.txt
Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), Jeff nudged the transimpedance a bit to get the magnitude scale within the ~0.25%, shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from G2501621, a la what was done for PR3 and SR3 top masses in LHO:86222 and LHO:84531 respectively.
Here's the characterization data and fit results for S1000274, assigned to PR3 M2's ULLLURLR OSEMs.
This sat amp is a UK 4CH sat amp, D0900900 / D0901284. The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 1 of the Measurement Diagrams from LHO:86807.
The data was processed and fit using ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
plotresponse_S1000274_PR3_M2_ULLLURLR_20251020.m
Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are:
| Optic | Stage | Serial_Number | Channel_Number | OSEM_Name | Zero_Pole_Hz | R_TIA_kOhm | Foton_Design |
|---|---|---|---|---|---|---|---|
| PR3 | M2 | S1000274 | CH1 | UL | 0.0947:5.17 | 120.25 | zpk([5.17],[0.0947],1,"n") |
| CH2 | LL | 0.0961:5.24 | 120.25 | zpk([5.24],[0.0961],1,"n") | |||
| CH3 | UR | 0.0963:5.26 | 120.0 | zpk([5.26],[0.0963],1,"n") | |||
| CH4 | LR | 0.0962:5.25 | 120.25 | zpk([5.25],[0.0962],1,"n") |
The attached plot and machine readable .txt file version of the above table are also found in ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/
2025-10-20_UKSatAmp_S1000274_D0901284-v5_fitresults.txt
Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), Jeff nudged the transimpedance a bit to get the magnitude scale within the ~0.25%, shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from G2501621, a la what was done for PR3 and SR3 top masses in LHO:86222 and LHO:84531 respectively.
Here's the characterization data and fit results for S1000277, assigned to PR3 M3's ULLLURLR OSEMs.
This sat amp is a UK 4CH sat amp, D0900900 / D0901284. The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 1 of the Measurement Diagrams from LHO:86807.
The data was processed and fit using ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
plotresponse_S1000277_PR3_M3_ULLLURLR_20251020.m
Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are:
| Optic | Stage | Serial_Number | Channel_Number | OSEM_Name | Zero_Pole_Hz | R_TIA_kOhm | Foton_Design |
|---|---|---|---|---|---|---|---|
| PR3 | M3 | S1000277 | CH1 | UL | 0.0962:5.26 | 120.0 | zpk([5.26],[0.0962],1,"n") |
| CH2 | LL | 0.0948:5.17 | 120.5 | zpk([5.17],[0.0948],1,"n") | |||
| CH3 | UR | 0.0941:5.12 | 120.5 | zpk([5.12],[0.0941],1,"n") | |||
| CH4 | LR | 0.0958:5.23 | 120.25 | zpk([5.23],[0.0958],1,"n") |
The attached plot and machine readable .txt file version of the above table are also found in ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/
2025-10-20_UKSatAmp_S1000277_D0901284-v5_fitresults.txt
Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), Jeff nudged the transimpedance a bit to get the magnitude scale within the ~0.25%, shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from G2501621, a la what was done for PR3 and SR3 top masses in LHO:86222 and LHO:84531 respectively.
Here's the characterization data and fit results for S1100169, assigned to MC2 M2's ULLLURLR OSEMs.
This sat amp is a UK 4CH sat amp, D0900900 / D0901284. The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 1 of the Measurement Diagrams from LHO:86807.
The data was processed and fit using ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
plotresponse_S1100169_MC2_M2_ULLLURLR_20251020.m
Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are:
| Optic | Stage | Serial_Number | Channel_Number | OSEM_Name | Zero_Pole_Hz | R_TIA_kOhm | Foton_Design |
|---|---|---|---|---|---|---|---|
| MC2 | M2 | S1100169 | CH1 | UL | 0.0976:5.34 | 120.25 | zpk([5.34],[0.0976],1,"n") |
| CH2 | LL | 0.0964:5.26 | 120.25 | zpk([5.26],[0.0964],1,"n") | |||
| CH3 | UR | 0.0955:5.21 | 120.25 | zpk([5.21],[0.0955],1,"n") | |||
| CH4 | LR | 0.0973:5.31 | 120.2 | zpk([5.31],[0.0973],1,"n") |
The attached plot and machine readable .txt file version of the above table are also found in ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/
2025-10-20_UKSatAmp_S1100169_D0901284-v5_fitresults.txt
Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), Jeff nudged the transimpedance a bit to get the magnitude scale within the ~0.25%, shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from G2501621, a la what was done for PR3 and SR3 top masses in LHO:86222 and LHO:84531 respectively.
Here's the characterization data and fit results for S1100174, assigned to MC2 M3's ULLLURLR OSEMs.
This sat amp is a UK 4CH sat amp, D0900900 / D0901284. The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 1 of the Measurement Diagrams from LHO:86807.
The data was processed and fit using ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
plotresponse_S1100174_MC2_M3_ULLLURLR_20251020.m
Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are:
| Optic | Stage | Serial_Number | Channel_Number | OSEM_Name | Zero_Pole_Hz | R_TIA_kOhm | Foton_Design |
|---|---|---|---|---|---|---|---|
| MC2 | M3 | S1100174 | CH1 | UL | 0.0993:5.43 | 120 | zpk([5.43],[0.0993],1,"n") |
| CH2 | LL | 0.0969:5.3 | 120 | zpk([5.3],[0.0969],1,"n") | |||
| CH3 | UR | 0.0951:5.2 | 120 | zpk([5.2],[0.0951],1,"n") | |||
| CH4 | LR | 0.0952:5.2 | 120 | zpk([5.2],[0.0952],1,"n") |
The attached plot and machine readable .txt file version of the above table are also found in ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/
2025-10-20_UKSatAmp_S1100174_D0901284-v5_fitresults.txt
Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), Jeff nudged the transimpedance a bit to get the magnitude scale within the ~0.25%, shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from G2501621, a la what was done for PR3 and SR3 top masses in LHO:86222 and LHO:84531 respectively.
Here's the characterization data and fit results for S1100146, assigned to SR3 M2's ULLLURLR OSEMs.
This sat amp is a UK 4CH sat amp, D0900900 / D0901284. The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 1 of the Measurement Diagrams from LHO:86807.
The data was processed and fit using ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
plotresponse_S1100146_SR3_M2_ULLLURLR_20251020.m
Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are:
| Optic | Stage | Serial_Number | Channel_Number | OSEM_Name | Zero_Pole_Hz | R_TIA_kOhm | Foton_Design |
|---|---|---|---|---|---|---|---|
| SR3 | M2 | S1100146 | CH1 | UL | 0.0968:5.29 | 120.0 | zpk([5.29],[0.0968],1,"n") |
| CH2 | LL | 0.0989:5.4 | 120.0 | zpk([5.4],[0.0989],1,"n") | |||
| CH3 | UR | 0.0948:5.18 | 120.0 | zpk([5.18],[0.0948],1,"n") | |||
| CH4 | LR | 0.0966:5.27 | 120.25 | zpk([5.27],[0.0966],1,"n") |
The attached plot and machine readable .txt file version of the above table are also found in ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/
2025-10-20_UKSatAmp_S1100146_D0901284-v5_fitresults.txt
Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), Jeff nudged the transimpedance a bit to get the magnitude scale within the ~0.25%, shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from G2501621, a la what was done for PR3 and SR3 top masses in LHO:86222 and LHO:84531 respectively.
Here's the characterization data and fit results for S1100134, assigned to SR3 M3's ULLLURLR OSEMs.
This sat amp is a UK 4CH sat amp, D0900900 / D0901284. The data was taken per methods described in T080062-v3, using the diagrammatic setup shown on PAGE 1 of the Measurement Diagrams from LHO:86807.
The data was processed and fit using ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Scripts/
plotresponse_S1100134_SR3_M3_ULLLURLR_20251020.m
Explicitly, the fit to the whitening stage zero and pole, the transimpedance feedback resistor, and foton design string are:
| Optic | Stage | Serial_Number | Channel_Number | OSEM_Name | Zero_Pole_Hz | R_TIA_kOhm | Foton_Design |
|---|---|---|---|---|---|---|---|
| SR3 | M3 | S1100134 | CH1 | UL | 0.0975:5.32 | 120.0 | zpk([5.32],[0.0975],1,"n") |
| CH2 | LL | 0.0958:5.23 | 120.0 | zpk([5.23],[0.0958],1,"n") | |||
| CH3 | UR | 0.0958:5.22 | 120.375 | zpk([5.22],[0.0958],1,"n") | |||
| CH4 | LR | 0.0985:5.38 | 120.25 | zpk([5.38],[0.0985],1,"n") |
The attached plot and machine readable .txt file version of the above table are also found in ${SusSVN}/trunk/electronicstesting/lho_electronics_testing/satamp/ECR_E2400330/Results/
2025-10-20_UKSatAmp_S1100134_D0901284-v5_fitresults.txt
Per usual, R_TIA_kOhm is not used in the compensation filter -- but after ruling out an adjustment in the zero frequency (by zeroing the phase residual at the lowest few frequency points), Jeff nudged the transimpedance a bit to get the magnitude scale within the ~0.25%, shown in the attached results. Any scaling like this will be accounted for instead with the absolute calibration step, i.e. Side Quest 4 from G2501621, a la what was done for PR3 and SR3 top masses in LHO:86222 and LHO:84531 respectively.
